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Kawahara K, Matsuno H, Tanaka K. Aggregation States and Segmental Dynamics of Poly(methyl methacrylate) in Nanofiber Mats. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:7192-7200. [PMID: 37171789 DOI: 10.1021/acs.langmuir.3c00698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Nanofiber mats composed of polymers, having a large surface-to-volume ratio and high porosity, have been widely applied in the environmental and biomedical fields but fundamental knowledge on the polymer chains in the mats seems to be limited. We here report the aggregation states and segmental dynamics of poly(methyl methacrylate)s (PMMAs) with different stereoregularities in electrospun nanofiber mats. Attenuated total reflectance Fourier transform infrared (ATR/FTIR) spectroscopy revealed that, in the case of atactic PMMA (at-PMMA), the population of the trans-trans conformation of the main chain part, which allows carbonyl groups of the side group to interact affirmatively with each other, increased in the electrospun nanofiber mat. On the other hand, in the case of isotactic PMMA (it-PMMA), the skeletal conformation was unchanged even in the nanofiber mat. As a result of the aggregation states of PMMA chains, the glass-transition temperature (Tg) of the electrospun nanofiber mats increased and remained unchanged from the corresponding bulk value for at- and it-PMMA, respectively. These findings should be useful for designing materials and devices composed of electrospun nanofibers.
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Affiliation(s)
- Keigo Kawahara
- Department of Applied Chemistry, Kyushu University, Fukuoka 819-0395, Japan
| | - Hisao Matsuno
- Department of Applied Chemistry, Kyushu University, Fukuoka 819-0395, Japan
- Centre for Polymer Interface and Molecular Adhesion Science, Kyushu University, Fukuoka 819-0395, Japan
| | - Keiji Tanaka
- Department of Applied Chemistry, Kyushu University, Fukuoka 819-0395, Japan
- Centre for Polymer Interface and Molecular Adhesion Science, Kyushu University, Fukuoka 819-0395, Japan
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2
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Zeng H, Hu C, Wu D, Xia J. Boosting the Photovoltaic Performance and Thermal Stability of Organic Solar Cells via an Insulating Fluoropolymer Additive. Chempluschem 2022; 87:e202200045. [DOI: 10.1002/cplu.202200045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Revised: 04/18/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Hang Zeng
- Wuhan University of Technology State Key laboratory of Advanced Technology for Materials Synthesis and Processing CHINA
| | - Cetao Hu
- Wuhan University of Technology State Key laboratory of Advanced Technology for Materials Synthesis and Processing CHINA
| | - Di Wu
- Wuhan University of Technology School of Chemistry, Chemical Engineering and Life Science No. 122 Luoshi Road, Wuhan 430070 Wuhan CHINA
| | - Jianlong Xia
- Wuhan University of Technology State Key laboratory of Advanced Technology for Materials Synthesis and Processing CHINA
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3
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Chat K, Tu W, Beena Unni A, Adrjanowicz K. Influence of Tacticity on the Glass-Transition Dynamics of Poly(methyl methacrylate) (PMMA) under Elevated Pressure and Geometrical Nanoconfinement. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01341] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Katarzyna Chat
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Wenkang Tu
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Aparna Beena Unni
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Karolina Adrjanowicz
- Institute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
- Silesian Center for Education and Interdisciplinary Research (SMCEBI), 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
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4
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Evaluation of the dielectric parameters from TSDC spectra: application to polymeric systems. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/pl00010780] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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5
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Yu J, Li M, Yu Y, Gao Y, Liu J, Sun F. Synthetic Strategy and Performances of a UV-Curable Poly Acryloyl Phosphinate Flame Retardant by Carbene Polymerization. PHOSPHORUS SULFUR 2015. [DOI: 10.1080/10426507.2015.1049741] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Jia Yu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China
- College of Science, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Minglei Li
- College of Science, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Yong Yu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China
- College of Science, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Yanjing Gao
- College of Science, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Jiancheng Liu
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, USA
| | - Fang Sun
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China
- College of Science, Beijing University of Chemical Technology, Beijing, 100029, PR China
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6
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Yu Y, Jiang S, Sun F. Synthesis and Properties of a Photopolymerizable Carbene-Mediated Poly Phosphinate Flame Retardant by Carbene Polymerization. Ind Eng Chem Res 2014. [DOI: 10.1021/ie502023v] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yong Yu
- State Key Laboratory of Chemical Resource Engineering, ‡College of Science, and §College of Materials
Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Shengling Jiang
- State Key Laboratory of Chemical Resource Engineering, ‡College of Science, and §College of Materials
Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Fang Sun
- State Key Laboratory of Chemical Resource Engineering, ‡College of Science, and §College of Materials
Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
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7
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ODA Y, TANAKA K. Aggregation States and Molecular Motion of Well-Defined Vinyl Polymers at the Water Interface. KOBUNSHI RONBUNSHU 2014. [DOI: 10.1295/koron.71.343] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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8
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Blaszczyk-Lezak I, Hernández M, Mijangos C. One Dimensional PMMA Nanofibers from AAO Templates. Evidence of Confinement Effects by Dielectric and Raman Analysis. Macromolecules 2013. [DOI: 10.1021/ma400173q] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Iwona Blaszczyk-Lezak
- Instituto de Ciencia y Tecnología
de Polímeros, CSIC, Juan de la Cierva
3, 28006 Madrid, Spain
| | - Marianella Hernández
- Instituto de Ciencia y Tecnología
de Polímeros, CSIC, Juan de la Cierva
3, 28006 Madrid, Spain
| | - Carmen Mijangos
- Instituto de Ciencia y Tecnología
de Polímeros, CSIC, Juan de la Cierva
3, 28006 Madrid, Spain
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9
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Banerjee S, Paira TK, Mandal TK. Control of Molecular Weight and Tacticity in Stereospecific Living Cationic Polymerization of α-Methylstyrene at 0 °C Using FeCl3
-Based Initiators: Effect of Tacticity on Thermal Properties. MACROMOL CHEM PHYS 2013. [DOI: 10.1002/macp.201300092] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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10
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Horinouchi A, Tanaka K. An effect of stereoregularity on the structure of poly(methyl methacrylate) at air and water interfaces. RSC Adv 2013. [DOI: 10.1039/c3ra40631h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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11
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Nikiforov MP, Gam S, Jesse S, Composto RJ, Kalinin SV. Morphology Mapping of Phase-Separated Polymer Films Using Nanothermal Analysis. Macromolecules 2010. [DOI: 10.1021/ma1011254] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. P. Nikiforov
- The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| | - S. Gam
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - S. Jesse
- The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
| | - R. J. Composto
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - S. V. Kalinin
- The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
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12
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Chen K, Harris K, Vyazovkin S. Tacticity as a Factor Contributing to the Thermal Stability of Polystyrene. MACROMOL CHEM PHYS 2007. [DOI: 10.1002/macp.200700426] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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13
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Gross S, Camozzo D, Di Noto V, Armelao L, Tondello E. PMMA: A key macromolecular component for dielectric low-κ hybrid inorganic–organic polymer films. Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2006.12.012] [Citation(s) in RCA: 151] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Using mechanical spectroscopies to study the glass transition dynamics in unsaturated polyester resins cured with different styrene contents. Colloid Polym Sci 2005. [DOI: 10.1007/s00396-004-1218-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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15
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Delbreilh L, Bernès A, Lacabanne C. Secondary Retardation/Relaxation Processes in Bisphenol A Polycarbonate: Thermostimulated Creep and Dynamic Mechanical Analysis Combined Investigations. INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION 2005. [DOI: 10.1080/10236660500345885] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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16
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Bobiak JP, Koenig JL. Fourier transform infrared imaging of stereoregular poly(methyl methacrylate) dissolution. APPLIED SPECTROSCOPY 2004; 58:1141-1146. [PMID: 18070398 DOI: 10.1366/0003702042336091] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Fourier transform infrared (FT-IR) imaging was used to study dissolution of stereoregular poly(methyl methacrylate) (PMMA) films in toluene, benzene, chloroform, acetic acid, and 2-ethoxyethanol. Images of the polymer-solvent interface showed that syndiotactic (sPMMA), atactic (aPMMA), and isotactic (iPMMA) samples dissolved in acetic acid and chloroform; only iPMMA dissolved in benzene, toluene, and 2-ethoxyethanol. Concentration profiles allowed quantitative comparison of each polymer-solvent system. In the cases of chloroform and acetic acid, the rate of polymer dissolution increased with increasing isotacticity. Dissolution of PMMA in chloroform was observed to coincide with development of strong polymer-solvent interactions. The results of systems containing toluene, benzene, and 2-ethoxyethanol reflect kinetic effects on dissolution, including solvent size and stiffness of the polymer backbone.
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Affiliation(s)
- J P Bobiak
- Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106, USA
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17
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Alves NM, Gómez Ribelles JL, Gómez Tejedor JA, Mano JF. Viscoelastic Behavior of Poly(methyl methacrylate) Networks with Different Cross-Linking Degrees. Macromolecules 2004. [DOI: 10.1021/ma035626z] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- N. M. Alves
- Polymer Engineering Department, University of Minho, Campus of Azurém,
4800-058 Guimarães, Portugal; 3B's Research Group—Biomaterials, Biodegradables and
Biomimetics, University of Minho, 4710-057 Braga, Portugal; Center for Biomaterials and
Department of Applied Thermodynamics, Universidad Politécnica de Valencia, P.O. Box 22012,
E-46071 Valencia, Spain; and Center for Biomaterials and Department of Applied Physics,
Universidad Politécnica de Valencia, Escuela Universitaria de Informática, E-46022
| | - J. L. Gómez Ribelles
- Polymer Engineering Department, University of Minho, Campus of Azurém,
4800-058 Guimarães, Portugal; 3B's Research Group—Biomaterials, Biodegradables and
Biomimetics, University of Minho, 4710-057 Braga, Portugal; Center for Biomaterials and
Department of Applied Thermodynamics, Universidad Politécnica de Valencia, P.O. Box 22012,
E-46071 Valencia, Spain; and Center for Biomaterials and Department of Applied Physics,
Universidad Politécnica de Valencia, Escuela Universitaria de Informática, E-46022
| | - J. A. Gómez Tejedor
- Polymer Engineering Department, University of Minho, Campus of Azurém,
4800-058 Guimarães, Portugal; 3B's Research Group—Biomaterials, Biodegradables and
Biomimetics, University of Minho, 4710-057 Braga, Portugal; Center for Biomaterials and
Department of Applied Thermodynamics, Universidad Politécnica de Valencia, P.O. Box 22012,
E-46071 Valencia, Spain; and Center for Biomaterials and Department of Applied Physics,
Universidad Politécnica de Valencia, Escuela Universitaria de Informática, E-46022
| | - J. F. Mano
- Polymer Engineering Department, University of Minho, Campus of Azurém,
4800-058 Guimarães, Portugal; 3B's Research Group—Biomaterials, Biodegradables and
Biomimetics, University of Minho, 4710-057 Braga, Portugal; Center for Biomaterials and
Department of Applied Thermodynamics, Universidad Politécnica de Valencia, P.O. Box 22012,
E-46071 Valencia, Spain; and Center for Biomaterials and Department of Applied Physics,
Universidad Politécnica de Valencia, Escuela Universitaria de Informática, E-46022
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18
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Departure from the Vogel behaviour in the glass transition—thermally stimulated recovery, creep and dynamic mechanical analysis studies. POLYMER 2004. [DOI: 10.1016/j.polymer.2003.04.002] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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19
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Kalogeras IM. Thermally stimulated currents of poly(methyl methacrylate): Comments on the molecular origin of a Debye-type signal between the α- and β-relaxation modes. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/polb.10749] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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20
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Alie J, Menegotto J, Cardon P, Duplaa H, Caron A, Lacabanne C, Bauer M. Dielectric study of the molecular mobility and the isothermal crystallization kinetics of an amorphous pharmaceutical drug substance. J Pharm Sci 2004; 93:218-33. [PMID: 14648651 DOI: 10.1002/jps.10520] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
During the development of new pharmaceutical products based on drug substances in their amorphous form, the molecular mobility of an amorphous active ingredient was characterized in detail within a very broad time-temperature range. The relation between the isothermal crystallization kinetics and the dynamics of this amorphous substance was investigated. First, dynamic dielectric spectroscopy (DDS) and the thermostimulated current (TSC) techniques were used to analyze the molecular mobility of the amorphous drug substance over a wide frequency and temperature range (the drug substance is referred to as SSR in this text and was chosen as a model glass-forming system). Two relaxation processes, corresponding to different molecular motions, were identified. The beta(a)-relaxation process, associated with intramolecular oscillation of small dipolar groups, followed Arrhenius temperature behavior over the entire time-temperature domain that was studied. However, the main alpha(a)-relaxation process, assigned to the dielectric manifestation of the dynamic glass transition of the amorphous phase, was described by Vogel-Fulcher-Tammann (VFT) and Arrhenius behavior above and below the glass transition temperature (T(g)) respectively. The physical meaning of these complex dynamics is explained in the context of the Adam and Gibbs (AG) model, by the temperature dependence of the size of cooperatively rearranging regions (CRR) that govern the time scale of delocalized molecular motions. The distinction between the molecular mobility and the structural relaxation of amorphous systems below T(g) is discussed. This work shows that the complementary nature of both DDS and TSC techniques is essential to directly analyze the intramolecular and molecular motions of disordered phases over a wide time-temperature range above and below the T(g). Second, real-time dielectric measurements were carried out to determine the isothermal crystallization kinetics of the SSR amorphous drug. Whatever the crystalline form obtained over time in the crystallization process, the decrease of the dielectric response of amorphous phase, which is characteristic of the isothermal crystallization, was studied to monitor the time dependence of the degree of crystallinity. The characteristic crystallization time, derived from Kohlrausch-Williams-Watt (KWW)-Avrami analyses performed at different temperatures, followed an Arrhenius temperature dependence. Behaviors specific to the molecular mobility of the amorphous drug substance were compared with the characteristic crystallization time. It was concluded that the crystal growth process of the SSR drug seems to be controlled by the intramolecular motions involving the beta(a)-relaxation mode and not by the molecular motions responsible for the alpha(a)-relaxation mode in the range of temperatures >T(g). Subsequent studies will focus on the crystallization process of the SSR drug in the glassy state (T < T(g)).
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Affiliation(s)
- J Alie
- Polymer Physics Laboratory, CIRIMAT UMR 5085, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France
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Tretinnikov ON, Ohta K. Conformation-Sensitive Infrared Bands and Conformational Characteristics of Stereoregular Poly(methyl methacrylate)s by Variable-Temperature FTIR Spectroscopy. Macromolecules 2002. [DOI: 10.1021/ma020411v] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Oleg N. Tretinnikov
- B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk 220072, Belarus; and Research Institute of Photonics, AIST, Kansai Center, Ikeda, Osaka 563-8577, Japan
| | - Koji Ohta
- B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk 220072, Belarus; and Research Institute of Photonics, AIST, Kansai Center, Ikeda, Osaka 563-8577, Japan
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22
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Molecular mobility in polymers studied with thermally stimulated recovery. II. Study of the glass transition of a semicrystalline PET and comparison with DSC and DMA results. POLYMER 2002. [DOI: 10.1016/s0032-3861(02)00176-3] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Boutonnet-Fagegaltier N, Menegotto J, Lamure A, Duplaa H, Caron A, Lacabanne C, Bauer M. Molecular mobility study of amorphous and crystalline phases of a pharmaceutical product by thermally stimulated current spectrometry. J Pharm Sci 2002; 91:1548-60. [PMID: 12115853 DOI: 10.1002/jps.10146] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Two crystalline forms and the amorphous state of irbesartan, a pharmaceutical drug chosen as a model, were analyzed by Thermally Stimulated Current (TSC) spectroscopy, a powerful technique currently used in polymer science to investigate the molecular dynamics of heterogeneous and complex materials. Whereas no specific dielectric response was noted for the B crystalline form, the A form of irbesartan exhibited molecular motions localized inside its channel structure. The dynamics involved in the dielectric glass transition of amorphous samples followed a compensation law characteristic of highly cooperative relaxation processes. Concerning the amorphous content in physical mixtures, a calibration curve and a limit of detection (2.5%) were established. The limit of detection could be improved by optimizing the TSC experimental parameters. The amorphous sample recrystallized at a single temperature was interpreted by the "idealized one-state model" defined here to describe systems composed of identical semicrystalline particles in which amorphous and crystalline phases are independent of each other (i.e., no chemical and physical interaction between the two phases). Therefore, the idealized one-state model may be simulated by a two-state model, which is representative of the two-phase model. Other samples recrystallized through a complex annealing stage were explained by the classical one-state model in agreement with the three-phase model used to describe bulk semicrystalline systems. These results demonstrate that, as for polymers, the semicrystalline state of pharmaceutical drugs should not be considered as a single state but as a more complex system that can be described as an idealized one-state model or a one-state model depending on the applied thermal treatment. These results give a new view that should be taken into account in the development of amorphous pharmaceutical drugs and formulations.
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Affiliation(s)
- Nathalie Boutonnet-Fagegaltier
- Laboratoire de Physique des Polymères, CIRIMAT UMR 5085, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse Cedex, France
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24
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Alves N, Mano J, Gómez Ribelles J. Influence of experimental variables on thermally stimulated recovery results: analysis of simulations and real data on a polymeric system. POLYM INT 2002. [DOI: 10.1002/pi.862] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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25
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Affiliation(s)
- João F. Mano
- Polymer Engineering Department, University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal
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