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Dual physically and chemically cross-linked polyelectrolyte nanohydrogels: Compositional and pH-dependent behavior studies. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2019.109398] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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2
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Arens L, Wilhelm M. Self‐Assembled Acrylic ABA Triblock Copolymer Hydrogels with Various Block Compositions: Water Absorbency, Rheology, and SAXS. MACROMOL CHEM PHYS 2019. [DOI: 10.1002/macp.201900093] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Lukas Arens
- Karlsruhe Institute of Technology (KIT)Institute for Technical Chemistry and Polymer Chemistry (ITCP) Engesserstr. 18 D‐76131 Karlsruhe Germany
| | - Manfred Wilhelm
- Karlsruhe Institute of Technology (KIT)Institute for Technical Chemistry and Polymer Chemistry (ITCP) Engesserstr. 18 D‐76131 Karlsruhe Germany
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3
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Ashrafizadeh M, Tam KC, Javadi A, Abdollahi M, Sadeghnejad S, Bahramian A. Synthesis and physicochemical properties of dual-responsive acrylic acid/butyl acrylate cross-linked nanogel systems. J Colloid Interface Sci 2019; 556:313-323. [PMID: 31454623 DOI: 10.1016/j.jcis.2019.08.066] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 08/16/2019] [Accepted: 08/17/2019] [Indexed: 12/22/2022]
Abstract
HYPOTHESIS A cross-linked amphiphilic nanogel containing a high mole% of hydrophilic pH-responsive moiety can provide enhanced functionality regarding stimuli-responsiveness, water-dispersibility, hydrophobic substance loading, and structural stability under harsh environmental conditions. These nanogels could be synthesized using a one-pot procedure for large-scale applications. Moreover, the interplay of various interaction forces in these colloidal systems is being investigated. EXPERIMENTS Model nanogels consisting of acrylic acid-butyl acrylate-ethylene glycoldimethacrylate were synthesized using an emulsion copolymerization via a seeded semi-batch process under an acidic condition. The structures were assessed by Fourier transform infrared spectroscopy and potentiometric-conductometric titrations. Zeta potential, field-emission scanning electron microscopy, and transmission electron microscopy were used to evaluate the dispersion stability, size distribution, and structural distribution, respectively. Their stimuli-responsive behavior was studied by combining static and dynamic light scattering and titration analyses. FINDINGS Monodisperse nanospheres of approximately 150 nm were successfully prepared by implementing a one-pot practical pathway. These nanogels displayed a dual thermo- and pH-responsive behavior, reflecting the high efficiency of physical cross-linking make it ideal for drug delivery and oil industry applications. Moreover, a novel symmetric pH-activated morphology transformation behavior was revealed. Accordingly, a compositional distribution was proposed and assessed by exploring the polymerization process.
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Affiliation(s)
- Marjan Ashrafizadeh
- Department of Chemical Engineering, College of Engineering, University of Tehran, 11155/4563 Tehran, Iran.
| | - Kam Chiu Tam
- Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.
| | - Aliyar Javadi
- Department of Chemical Engineering, College of Engineering, University of Tehran, 11155/4563 Tehran, Iran; Max Planck Institute of Colloids and Interfaces Potsdam/Golm, Germany.
| | - Mahdi Abdollahi
- Department of Polymer Reaction Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, 14115-114 Tehran, Iran.
| | - Saeid Sadeghnejad
- Department of Petroleum Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, 14115-114 Tehran, Iran.
| | - Alireza Bahramian
- Department of Chemical Engineering, College of Engineering, University of Tehran, 11155/4563 Tehran, Iran.
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4
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Huang LM, Li LD, Shang L, Zhou QH, Lin J. Preparation of pH-sensitive micelles from miktoarm star block copolymers by ATRP and their application as drug nanocarriers. REACT FUNCT POLYM 2016. [DOI: 10.1016/j.reactfunctpolym.2016.08.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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5
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Lahooti-Fard F, Imani M, Yousefi AA, Babaie M. Formation of liquid-crystalline morphologies in dilute solutions of a charged random terpolymer. POLYM INT 2014. [DOI: 10.1002/pi.4673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Farzad Lahooti-Fard
- Novel Drug Delivery Systems Department; Iran Polymer and Petrochemical Institute; PO Box 14965/115 Tehran Iran
| | - Mohammad Imani
- Novel Drug Delivery Systems Department; Iran Polymer and Petrochemical Institute; PO Box 14965/115 Tehran Iran
| | - Ali Akbar Yousefi
- Department of Plastics; Iran Polymer and Petrochemical Institute; PO Box 14965/115 Tehran Iran
| | - Maryam Babaie
- Novel Drug Delivery Systems Department; Iran Polymer and Petrochemical Institute; PO Box 14965/115 Tehran Iran
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6
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Chung YT, Huang CI. Ion condensation behavior and dynamics of water molecules surrounding the sodium poly(methacrylic acid) chain in water: A molecular dynamics study. J Chem Phys 2012; 136:124903. [DOI: 10.1063/1.3697477] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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7
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Neugebauer D, Bury K, Pendziałek K. High molecular weight diblock and ABA/ABC triblock copolymers of tert-butyl (meth)acrylate. POLYM INT 2012. [DOI: 10.1002/pi.4164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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8
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Jin X, Li Y, Yu C, Ma Y, Yang L, Hu H. Synthesis of novel inorganic-organic hybrid materials for simultaneous adsorption of metal ions and organic molecules in aqueous solution. JOURNAL OF HAZARDOUS MATERIALS 2011; 198:247-256. [PMID: 22047723 DOI: 10.1016/j.jhazmat.2011.10.040] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Revised: 09/25/2011] [Accepted: 10/12/2011] [Indexed: 05/31/2023]
Abstract
In this paper, atom transfer radical polymerization (ATRP) and radical grafting polymerization were combined to synthesize a novel amphiphilic hybrid material, meanwhile, the amphiphilic hybrid material was employed in the absorption of heavy metal and organic pollutants. After the formation of attapulgite (ATP) ATRP initiator, ATRP block copolymers of styrene (St) and divinylbenzene (DVB) were grafted from it as ATP-P(S-b-DVB). Then radical polymerization of acrylonitrile (AN) was carried out with pendent double bonds in the DVD units successfully, finally we got the inorganic-organic hybrid materials ATP-P(S-b-DVB-g-AN). A novel amphiphilic hybrid material ATP-P(S-b-DVB-g-AO) (ASDO) was obtained after transforming acrylonitrile (AN) units into acrylamide oxime (AO) as hydrophilic segment. The adsorption capacity of ASDO for Pb(II) could achieve 131.6 mg/g, and the maximum removal capacity of ASDO towards phenol was found to be 18.18 mg/g in the case of monolayer adsorption at 30°C. The optimum pH was 5 for both lead and phenol adsorption. The adsorption kinetic suited pseudo-second-order equation and the equilibrium fitted the Freundlich model very well under optimal conditions. At the same time FT-IR, TEM and TGA were also used to study its structure and property.
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Affiliation(s)
- Xinliang Jin
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Institute of Biochemical Engineering & Environmental Technology, Lanzhou University, Lanzhou, PR China
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Yang YQ, Zheng LS, Guo XD, Qian Y, Zhang LJ. pH-Sensitive Micelles Self-Assembled from Amphiphilic Copolymer Brush for Delivery of Poorly Water-Soluble Drugs. Biomacromolecules 2010; 12:116-22. [DOI: 10.1021/bm101058w] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- You Qiang Yang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
| | - Ling Shan Zheng
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
| | - Xin Dong Guo
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
| | - Yu Qian
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
| | - Li Juan Zhang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China
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Chao TI, Xiang S, Lipstate JF, Wang C, Lu J. Poly(methacrylic acid)-grafted carbon nanotube scaffolds enhance differentiation of hESCs into neuronal cells. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2010; 22:3542-3547. [PMID: 20652898 DOI: 10.1002/adma.201000262] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- Tzu-I Chao
- School of Engineering, Merced, CA 95343, USA
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11
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Giordanengo R, Viel S, Hidalgo M, Allard-Breton B, Thévand A, Charles L. Analytical strategy for the molecular weight determination of random copolymers of poly(methyl methacrylate) and poly(methacrylic acid). JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2010; 21:1075-1085. [PMID: 20202862 DOI: 10.1016/j.jasms.2010.02.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Revised: 02/01/2010] [Accepted: 02/06/2010] [Indexed: 05/28/2023]
Abstract
Molecular weight characterization of random amphiphilic copolymers currently represents an analytical challenge. In particular, molecules composed of methacrylic acid (MAA) and methyl methacrylate (MMA) as the repeat units raise issues in commonly used techniques. The present study shows that when random copolymers cannot be properly ionized by MALDI, and hence detected and measured in MS, one possible analytical strategy is to transform them into homopolymers, which are more amenable to this ionization technique. Then, by combining the molecular weight of the so-obtained homopolymers, as measured by MS, with the relative molar proportion of the MMA and MMA units, as given by (1)H NMR spectrum, one can straightforwardly estimate the molecular weight of the initial copolymer. A methylation reaction was performed to transform MAA-MMA copolymer samples into PMMA homopolymers, using trimethylsilyldiazomethane as a derivatization agent. Weight average molecular weight (M(w)) parameters of the MAA-MMA copolymers could then be derived from M(w) values obtained for the methylated MAA-MMA molecules by MALDI, which were also validated by pulsed gradient spin echo (PGSE) NMR. An alkene function in one of the studied copolymer end-groups was also shown to react with the methylation agent, giving rise to MMA-like polymeric by-products characterized by tandem mass spectrometry and which could be avoided by adjusting the amount of the trimethylsilyldiazomethane in the reaction medium.
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Affiliation(s)
- Rémi Giordanengo
- Universités Aix-Marseille I, II, and III-CNRS, UMR 6264: Laboratoire Chimie Provence, Spectrométries Appliquées à la Chimie Structurale, Marseille, France
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12
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Coelho JF, Ferreira PC, Alves P, Cordeiro R, Fonseca AC, Góis JR, Gil MH. Drug delivery systems: Advanced technologies potentially applicable in personalized treatments. EPMA J 2010; 1:164-209. [PMID: 23199049 PMCID: PMC3405312 DOI: 10.1007/s13167-010-0001-x] [Citation(s) in RCA: 194] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2009] [Accepted: 01/25/2010] [Indexed: 12/31/2022]
Abstract
Advanced drug delivery systems (DDS) present indubitable benefits for drug administration. Over the past three decades, new approaches have been suggested for the development of novel carriers for drug delivery. In this review, we describe general concepts and emerging research in this field based on multidisciplinary approaches aimed at creating personalized treatment for a broad range of highly prevalent diseases (e.g., cancer and diabetes). This review is composed of two parts. The first part provides an overview on currently available drug delivery technologies including a brief history on the development of these systems and some of the research strategies applied. The second part provides information about the most advanced drug delivery devices using stimuli-responsive polymers. Their synthesis using controlled-living radical polymerization strategy is described. In a near future it is predictable the appearance of new effective tailor-made DDS, resulting from knowledge of different interdisciplinary sciences, in a perspective of creating personalized medical solutions.
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Affiliation(s)
- Jorge F. Coelho
- Department of Chemical Engineering, University of Coimbra, 3030-290 Coimbra, Portugal
| | - Paula C. Ferreira
- Department of Chemical Engineering, University of Coimbra, 3030-290 Coimbra, Portugal
- Department of Health Sciences, Portuguese Catholic University, 3504-505 Viseu, Portugal
| | - Patricia Alves
- Department of Chemical Engineering, University of Coimbra, 3030-290 Coimbra, Portugal
| | - Rosemeyre Cordeiro
- Department of Chemical Engineering, University of Coimbra, 3030-290 Coimbra, Portugal
| | - Ana C. Fonseca
- Department of Chemical Engineering, University of Coimbra, 3030-290 Coimbra, Portugal
| | - Joana R. Góis
- Department of Chemical Engineering, University of Coimbra, 3030-290 Coimbra, Portugal
| | - Maria H. Gil
- Department of Chemical Engineering, University of Coimbra, 3030-290 Coimbra, Portugal
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13
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Tong D, Yao J, Wang Q, Zhai T, Li H, Han S. Synthesis and characterization of poly(dimethylamino ethyl methacrylate)-poly(ethylene oxide)-poly(dimethylamino ethyl methacrylate) triblock copolymers. J Appl Polym Sci 2009. [DOI: 10.1002/app.30688] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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14
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Barroso T, Temtem M, Casimiro T, Aguiar-Ricardo A. Development of pH-responsive poly(methylmethacrylate-co-methacrylic acid) membranes using scCO2 technology. Application to protein permeation. J Supercrit Fluids 2009. [DOI: 10.1016/j.supflu.2009.07.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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15
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Giordanengo R, Viel S, Hidalgo M, Allard-Breton B, Thévand A, Charles L. Structural characterization of a poly(methacrylic acid)-poly(methyl methacrylate) copolymer by nuclear magnetic resonance and mass spectrometry. Anal Chim Acta 2009; 654:49-58. [PMID: 19850168 DOI: 10.1016/j.aca.2009.06.044] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2009] [Revised: 06/16/2009] [Accepted: 06/18/2009] [Indexed: 12/01/2022]
Abstract
Mass spectrometry (MS) and nuclear magnetic resonance (NMR) have been combined to achieve the complete microstructural characterization of a poly(methacrylic acid)-poly(methyl methacrylate) (PMAA-PMMA) copolymer synthesized by nitroxide-mediated polymerization. Various PMAA-PMMA species could be identified which mainly differ in terms of terminaisons. 1H and 13C NMR experiments revealed the structure of the end-groups as well as the proportion of each co-monomer in the copolymers. These end-group masses were further confirmed from m/z values of doubly charged copolymer anions detected in the single stage mass spectrum. In contrast, copolymer composition derived from MS data was not consistent with NMR results, obviously due to strong mass bias well known to occur during electrospray ionization of these polymeric species. Tandem mass spectrometry could reveal the random nature of the copolymer based on typical dissociation reactions, i.e., water elimination occurred from any two contiguous MAA units while MAA-MMA pairs gave rise to the loss of a methanol molecule. Polymer backbone cleavages were also observed to occur and gave low abundance fragment ions which allowed the structure of the initiating end-group to be confirmed.
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Affiliation(s)
- Rémi Giordanengo
- Universités Aix-Marseille I, II et III-CNRS, UMR 6264: Laboratoire Chimie Provence, Spectrométries Appliquées à la Chimie Structurale, F-13397 Marseille, France
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Schmitz C, Mourran A, Keul H, Möller M. Synthesis and Association Behaviour of Linear Block Copolymers with Different Microstructures but the Same Composition. MACROMOL CHEM PHYS 2008. [DOI: 10.1002/macp.200800205] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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Dai S, Ravi P, Tam KC. pH-Responsive polymers: synthesis, properties and applications. SOFT MATTER 2008; 4:435-449. [PMID: 32907201 DOI: 10.1039/b714741d] [Citation(s) in RCA: 421] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
pH-Responsive polymers are systems whose solubility, volume, and chain conformation can be manipulated by changes in pH, co-solvent, and electrolytes. This review summarizes recent developments covering synthesis, physicochemical properties, and applications in various disciplines. A variety of synthetic methodologies comprising of emulsion polymerization and living radical polymerization techniques are described, and some of their salient features are highlighted. Several polymeric systems, such as homopolymers, block copolymers, microgels, hydrogels and polymer brushes at interfaces are reviewed, where important characteristics that govern their behavior in solutions are described. Potential applications of these systems in controlled drug delivery, personal and home care, industrial coatings, biological and membrane science, viscosity modifiers, colloid stabilization, and water remediation, are discussed.
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Affiliation(s)
- Sheng Dai
- National Institute for Nanotechnology, National Research Council Canada, 11421 Saskatchewan Drive, Edmonton, Alberta T6G 2M9, Canada
| | - Palaniswamy Ravi
- Innovation Centre, 3M Asia Pacific Pte. Ltd, 100 Woodlands Avenue 7, 738205, Singapore
| | - Kam Chiu Tam
- Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.
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Elaboration and characterization of poly (acrylic acid-co-crotonic acid) copolymers: Application to extraction of metal cations Pb(II), Cd(II) and Hg(II) by complexation in aqueous media. REACT FUNCT POLYM 2008. [DOI: 10.1016/j.reactfunctpolym.2007.10.030] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Ju SP, Lee WJ, Huang CI, Cheng WZ, Chung YT. Structure and dynamics of water surrounding the poly(methacrylic acid): A molecular dynamics study. J Chem Phys 2007; 126:224901. [PMID: 17581077 DOI: 10.1063/1.2743963] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
All-atom molecular dynamics simulations are used to study a single chain of poly(methacrylic acid) in aqueous solutions at various degrees of charge density. Through a combination of analysis on the radial distribution functions of water and snapshots of the equilibrated structure, we observe that local arrangements of water molecules, surrounding the functional groups of COO- and COOH in the chain, behave differently and correlated well to the resulting chain conformation behavior. In general, due to strong attractive interactions between water and charged COO- via the formation of hydrogen bonds, water molecules tend to form shell-like layers around the COO- groups. Furthermore, water molecules often act as a bridging agent between two neighboring COO- groups. These bridged water molecules are observed to stabilize the rodlike chain conformation that the highly charged chain reveals, as they significantly limit torsional and bending degrees of the backbone monomers. In addition, they display different dynamic properties from the bulk water. Both the resulting oxygen and hydrogen spectra are greatly shifted due to the presence of strong H-bonded interactions.
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Affiliation(s)
- Shin-Pon Ju
- Department of Mechanical and Electro-Mechanical Engineering, National Sun-Yat-Sen University, Kaohsiung 804, Taiwan.
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Guvendiren M, Shull KR. Self-assembly of acrylic triblock hydrogels by vapor-phase solvent exchange. SOFT MATTER 2007; 3:619-626. [PMID: 32900026 DOI: 10.1039/b615412c] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We investigate the self-assembly of poly(methyl methacrylate)-poly(methacrylic acid)-poly(methyl methacrylate) triblock copolymers by a vapor-phase solvent-exchange mechanism. Two acrylic triblock copolymers were synthesized with different hydrophilic/hydrophobic block ratios. Hydrogels were formed by exposing the solutions to saturated water vapor. As water diffuses into the solution, the hydrophobic end-blocks form aggregates that are bridged by the hydrophilic mid-blocks. Structure formation in the gels was characterized by small angle X-ray scattering, and swelling was measured in controlled pH buffer solutions. The solvent exchange process occurs while the methacrylic acid group remains in the protonated state. After swelling to equilibrium in water or controlled pH buffers, strong gels are formed with polymer-weight fractions between 0.01 and 0.15, and with shear moduli between 0.6 kPa and 3.5 kPa. Porous gels were produced by adding salt crystals to the polymer solution prior to solvent exchange. Salt was then leached out by immersing the gel into water. Structures of the porous hydrogels were characterized by confocal laser scanning microscopy.
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Affiliation(s)
- Murat Guvendiren
- Materials Science and Engineering Department, Northwestern University, 2220 Campus Drive, Evanston, IL, USA60208-3108.
| | - Kenneth R Shull
- Materials Science and Engineering Department, Northwestern University, 2220 Campus Drive, Evanston, IL, USA60208-3108.
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Černoch P, Štěpánek P, Pleštil J, Šlouf M, Sidorenko A, Stamm M. Surface patterns of block copolymers in thin layers after vapor treatment. Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2007.01.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Ryan AJ, Crook CJ, Howse JR, Topham P, Geoghegan M, Martin SJ, Parnell AJ, Ruiz‐Pérez L, Jones RAL. Mechanical Actuation by Responsive Polyelectrolyte Brushes and Triblock Gels. J MACROMOL SCI B 2007. [DOI: 10.1080/00222340500364387] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- A. J. Ryan
- a Department of Chemistry , University of Sheffield , Sheffield, UK
| | - C. J. Crook
- a Department of Chemistry , University of Sheffield , Sheffield, UK
| | - J. R. Howse
- a Department of Chemistry , University of Sheffield , Sheffield, UK
| | - P. Topham
- a Department of Chemistry , University of Sheffield , Sheffield, UK
| | - M. Geoghegan
- b Department of Physics and Astronomy , University of Sheffield , UK
| | - S. J. Martin
- b Department of Physics and Astronomy , University of Sheffield , UK
| | - A. J. Parnell
- b Department of Physics and Astronomy , University of Sheffield , UK
| | - L. Ruiz‐Pérez
- b Department of Physics and Astronomy , University of Sheffield , UK
| | - R. A. L. Jones
- b Department of Physics and Astronomy , University of Sheffield , UK
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Cosgrove T, Rodin V, Murray M, Buscall R. Self-diffusion in Solutions of Carboxylated Acrylic Polymers as Studied by Pulsed Field Gradient NMR. 1. Solvent Diffusion Studies. JOURNAL OF POLYMER RESEARCH 2007. [DOI: 10.1007/s10965-006-9087-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Klapper M, Clark Jr CG, Müllen K. Application-directed syntheses of surface-functionalized organic and inorganic nanoparticles. POLYM INT 2007. [DOI: 10.1002/pi.2301] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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25
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Li T, Lin J, Chen T, Zhang S. Polymeric micelles formed by polypeptide graft copolymer and its mixtures with polypeptide block copolymer. POLYMER 2006. [DOI: 10.1016/j.polymer.2006.04.011] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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26
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Inomata K, Kasuya M, Sugimoto H, Nakanishi E. Effect of helix-coil transition on association behavior of both-ends hydrophobically-modified water-soluble polypeptide. POLYMER 2005. [DOI: 10.1016/j.polymer.2005.08.049] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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27
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Polystyrene/melamine-formaldehyde hollow microsphere composite by self-assembling of latex particles at emulsion droplet interface. POLYMER 2005. [DOI: 10.1016/j.polymer.2005.06.015] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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28
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Brush-type amphiphilic polystyrene-g-poly(2-(dimethylamino)ethyl methacrylate)) copolymers from ATRP and their self-assembly in selective solvents. POLYMER 2005. [DOI: 10.1016/j.polymer.2005.06.030] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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29
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Ryan AJ, Crook CJ, Howse JR, Topham P, Jones AL, Geoghegan M, Parnell AJ, Ruiz-Pérez L, Martin SJ, Cadby A, Menelle A, Webster JRP, Gleeson AJ, Bras W. Responsive brushes and gels as components of soft nanotechnology. Faraday Discuss 2005; 128:55-74. [PMID: 15658767 DOI: 10.1039/b405700g] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Progress in the development of generic molecular devices based on responsive polymers is discussed. Characterisation of specially synthesised polyelectrolyte gels, "grafted from" brushes and triblock copolymers is reported. A Landolt pH-oscillator, based on bromate/ sulfite/ferrocyanide, with a room temperature period of 20 min and a range of 3.1 < pH < 7.0, has been used to drive periodic oscillations in volume in a pH responsive hydrogel. The gel is coupled to the reaction and changes volume by a factor of at least 6. A continuously stirred, constant volume, tank reactor was set-up on an optical microscope and the reaction pH and gel size monitored. The cyclic force generation of this system has been measured directly in a modified JKR experiment. The responsive nature of polyelectrolyte brushes, grown by surface initiated ATRP, have been characterised by scanning force microscopy, neutron reflectometry and single molecule force measurements. Triblock copolymers, based on hydrophobic end-blocks and either polyacid or polybase mid-block, have been used to produce polymer gels where the deformation of the molecules can be followed directly by SAXS and a correlation between molecular shape change and macroscopic deformation has been established. The three systems studied allow both the macroscopic and a molecular response to be investigated independently for the crosslinked gels and the brushes. The triblock copolymers demonstrate that the individual response of the polyelectrolyte molecules scale-up to give the macroscopic response of the system in an oscillating chemical reaction.
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Affiliation(s)
- A J Ryan
- Department of Chemistry, University of Sheffield, Sheffield, UK
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