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S A, R V, Sivakumar K, Dash S. Effect of antidiabetic drug metformin hydrochloride on micellization behavior of cetylpyridinium bromide in aqueous solution. J Biomol Struct Dyn 2023:1-14. [PMID: 37667900 DOI: 10.1080/07391102.2023.2249113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 08/11/2023] [Indexed: 09/06/2023]
Abstract
Herein, the interaction of an antidiabetic drug, metformin hydrochloride (MHCl), and a cationic surfactant, cetylpyridinium bromide (CPB) is investigated in an aqueous medium. The critical micellar concentration (CMC) of CPB is estimated through conductivity experiments and found to be reduced on adding MHCl and further decreased in the presence of NaCl. The reduced CMC is attributed to the solubilization of MHCl by CPB through micellization and the micellization is found to be thermodynamically spontaneous that experiences an augmentation in the presence of NaCl. This is identified from the negative value of standard free energy (Δ G0m). The higher negative value of Δ G0m (-55.41 kJ mol-1) for CPB + MHCl + NaCl than CPB (-37.89 kJ mol-1) and CPB + MHCl (-34.08 kJ mol-1) is suggestive of the above phenomenon. The positive values of Δ S0m in all three cases confirm that the micellization is entropy driven. The binding of MHCl on CPB is quantified by estimating binding constant using the Benesi-Hildebrand (B-H) plot through UV-visible spectral methods. The binding constant values were calculated to be 2.70 M-1 for CPB + MHCl + NaCl compared to 1.258 M-1 for CPB + MHCl predicting a favoring of micellization in the presence of NaCl which is higher than that in the presence of co-solvents. The molecular interaction of MHCl and CPB is justified using FT-IR and NMR techniques. The surface properties of drug surfactant interactions are assessed using SEM techniques. The point of interaction between the drug and surfactant is visualized through the molecular docking approach. The results suggest that CPB would be an effective solubilizer for developing MHCl drug formulations.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Anjali S
- Department of chemistry, Annamalai University, Chidambaram, Tamil Nadu, India
| | - Vigneshwari R
- Department of chemistry, Annamalai University, Chidambaram, Tamil Nadu, India
| | - K Sivakumar
- Department of Chemistry, Faculty of Science, Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya (Deemed to be University) [SCSVMV University], Kanchipuram, Tamil Nadu, India
| | - Sasmita Dash
- Department of chemistry, Annamalai University, Chidambaram, Tamil Nadu, India
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2
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Zheng Y, Bao Z, Fan Y, Wang X. Spectrometric Study on the Hydrophobic Hydration in the Formation of Tween-60 Micelles with Curcumin. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.121065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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3
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Bukhtawar F, Usman M, Akram N, Haq AU, Ahmad Z, Raza S, Younis S, Nazar MF. Enhanced solubilization of reactive dyes using mixed micellar media: insights from spectral and conductometric measurements. Colloid Polym Sci 2022. [DOI: 10.1007/s00396-022-05021-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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4
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Volumetric, compressibility and viscometric properties of diphenhydramine hydrochloride in aqueous solutions of electrolytes: An insight into interactional characteristics. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117481] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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5
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Interaction of sulphone based reactive dyes with cationic surfactant: a spectroscopic and conductometric study. Z PHYS CHEM 2021. [DOI: 10.1515/zpch-2020-1706] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Interaction of sulphone based reactive dyes, designated as dye-1 and dye-2, with cationic micellar system of cetyltrimethylammonium bromide (CTAB), has been investigated by spectroscopic and conductometeric measurements. Efficiency of the selected micellar systems is assessed by the values of binding constant (K
b
), partition coefficient (K
x
) and respective Gibbs energies. Critical micelle concentration (CMC) of surfactant, electrostatic and hydrophobic interactions as well as polarity of the medium plays significant role in this phenomenon. The negative values of Gibbs energies of binding (∆G
b
) and partition (∆G
p
) predicts the feasibility and spontaneity of respective processes. Similarly negative values of ∆G
m
and ∆H
m
and positive values of ∆S
m
, calculated from conductometeric data, further, revealed the exothermicity, spontaneity and, thus, stability of system. The results, herein, have disclosed the strong interaction between dye and surfactant molecules. The dye-2 has been observed to be solubilized to greater extent, as compared to dye 1, due to strong interaction ith hydrophiles of CTAB and accommodation of its molecules in palisade layer of micelle closer to the micelle/water interface.
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Shende VS, Pratap UR, Wankhade AV, Zodape SP. Investigation of the thermodynamic and compressibility properties of antihypertensive drug Hydralazine hydrochloride in aqueous and aqueous amino acids solutions at various temperatures. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114755] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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7
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Rashid MMM, Rahman M, Rahman MM, Mahbub S, Kumar D, Khan MR, Alothman ZA, Hoque MA. Aggregation, interaction and thermodynamic characteristics of cationic surfactant + moxifloxacin hydrochloride mixture in aquatic solutions of mono-/di-hydroxy compounds. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1849839] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
| | - Marzia Rahman
- Department of Chemistry, Jahangirnagar University, Savar, Bangladesh
| | | | - Shamim Mahbub
- Department of Chemistry & Physics, Gono Bishwabidyalay, Savar, Bangladesh
| | - Dileep Kumar
- Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam
- Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
| | - Mohammad Rizwan Khan
- Chemistry Department, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Zeid A. Alothman
- Chemistry Department, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Md. Anamul Hoque
- Department of Chemistry, Jahangirnagar University, Savar, Bangladesh
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Solution and Surface Properties of Metformin Hydrochloride in Aqueous Solution and Its Interaction with Amino Acids and Anionic Surfactant, Sodium Dodecyl Sulphate. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION A-PHYSICAL SCIENCES 2020. [DOI: 10.1007/s40010-018-0587-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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9
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Rehman A, Usman M, Bokhari TH, Haq AU, Saeed M, Rahman HMAU, Siddiq M, Rasheed A, Nisa MU. The application of cationic-nonionic mixed micellar media for enhanced solubilization of Direct Brown 2 dye. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112408] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Rehman A, Usman M, Bokhari TH, Rahman HMAU, Mansha A, Siddiq M, Rasheed A, Nisa MU. Effects of nonionic surfactant (TX-100) on solubilizing power of cationic surfactants (CTAB and CPC) for Direct Red 13. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124241] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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11
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Younis S, Usman M, Atta ul Haq, Akram N, Saeed M, Raza S, Siddiq M, Bukhtawar F. Solubilization of reactive dyes by mixed micellar system: Synergistic effect of nonionic surfactant on solubilizing power of cationic surfactant. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2019.136890] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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12
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Shakeel M, Mahmood K. Thermodynamic and solution properties of sodium valporate in aqueous solution and its interaction with cetyl trimethylammonium bromide (CTAB). J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.04.079] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Theoretical explanation for the pharmaceutical incompatibility through the cooperativity effect of the drug-drug intermolecular interactions in the phenobarbital∙∙∙paracetamol∙∙∙H 2O complex. J Mol Model 2019; 25:181. [PMID: 31175465 DOI: 10.1007/s00894-019-4060-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Accepted: 04/30/2019] [Indexed: 02/08/2023]
Abstract
In order to reveal the essence of the pharmaceutical incompatibility, the cooperativity effects of the drug-drug intermolecular π∙∙∙π and H∙∙∙O H-bonding interactions involving hydration were evaluated in the phenobarbital∙∙∙paracetamol∙∙∙H2O complex at the M06-2X/6-311++G** and MP2/6-311++G** levels. The thermodynamic cooperativity effects were also investigated by the statistical thermodynamic method. The results show that the π∙∙∙π stacking ternary complexes with the moderate anti-cooperativity effects are dominant in controling the aggregation process of phenobarbital, paracetamol, and H2O, as is confirmed by the atoms-in-molecules (AIM) and reduced density gradient (RDG) analyses. Therefore, it can be inferred that the anti-cooperativity effect plays an important role in forming the pharmaceutical incompatibility, and thus a deduction on the formation process of the pharmaceutical incompatibility between phenobarbital and paracetamol, with the hydration effect, is given. Several valuable models that relate the features of molecular surface electrostatic potentials or their statistical parameters, such as the surface areas, average values ([Formula: see text]), variances ([Formula: see text], [Formula: see text] and [Formula: see text]), and product of [Formula: see text] and electrostatic balance parameter (ν) ([Formula: see text]ν), to the values of the cooperativity effects were predicted. The formation of the pharmaceutical incompatibility is a thermodynamic cooperativity process driven by the enthalpy change. Graphical abstract Anti-cooperativity effect plays an important role in forming the pharmaceutical incompatibility.
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Lomesh SK, Bala M, Nathan V. Physicochemical approach to study the solute-solute and solute-solvent interactions of drug Levofloxacin hemihydrate in aqueous sorbitol solutions at different temperatures: Volumetric, acoustic and conductance studies. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.03.055] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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15
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Rashid S, Usman M, Shahzad T, Saeed M, Haq AU, Ibrahim M, Siddiq M, Iram M. The Differential Spectroscopic Investigation of Partitioning of Reactive Dyes in Micellar Media of Cationic Surfactant, Cetyl Trimethylammonium Bromide (CTAB). ACTA ACUST UNITED AC 2018. [DOI: 10.1515/zpch-2018-1142] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
This manuscript reports the solubilization of two reactive dyes viz. reactive black-5 (RB-5) and reactive black-8 (RB-8) in the micellar media of cationic surfactant, cetyl trimethylammonium bromide (CTAB) by differential UV/visible spectroscopy. Absorption spectra of said dyes in the presence of CTAB provide strong evidence about dye–surfactant interaction. In premicellar region ion association pair is formed between dye and surfactant while in post micellar region dye molecules get accommodated within the micelles. The values of critical micelle concentration (CMC) of CTAB in the presence of dyes, partition coefficient; Kx
, free energy of partition, ∆Gp
, binding constant, Kb
and free energy of binding, ∆Gb
were determined and compared for both dyes. It is, thus, concluded that RB-5 is solubilized to greater extent than RB-8 because of its incorporation in palisade layer of micelle close to micelle-water interface.
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Affiliation(s)
- Sadaf Rashid
- Department of Chemistry , Government College University , Faisalabad-38000 , Pakistan
| | - Muhammad Usman
- Department of Chemistry , Government College University , Faisalabad-38000 , Pakistan , Phone: +92-301-7853113
| | - Tanvir Shahzad
- Department of Environmental Sciences and Engineering , Government College University , Faisalabad-38000 , Pakistan
| | - Muhammad Saeed
- Department of Chemistry , Government College University , Faisalabad-38000 , Pakistan
| | - Atta Ul Haq
- Department of Chemistry , Government College University , Faisalabad-38000 , Pakistan
| | - Muhammad Ibrahim
- Department of Environmental Sciences and Engineering , Government College University , Faisalabad-38000 , Pakistan
| | - Muhammad Siddiq
- Department of Chemistry , Quaid-i-Azam University , Islamabad , Pakistan
| | - Misbah Iram
- Department of Chemistry , Government College University , Faisalabad-38000 , Pakistan
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16
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Saal W, Wyttenbach N, Alsenz J, Kuentz M. Can we estimate the critical micelle concentration of amphiphilic drug bases from molecular connectivity indices? Pharm Dev Technol 2017; 23:211-215. [DOI: 10.1080/10837450.2017.1316288] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Wiebke Saal
- University of Applied Sciences and Arts Northwestern Switzerland, School of Life Sciences, Institute of Pharma Technology, Muttenz, Switzerland
- University of Basel, Institute of Pharmaceutical Technology, Basel, Switzerland
| | - Nicole Wyttenbach
- Roche Pharmaceutical Research and Early Development, Pre-Clinical CMC, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd, Basel, Switzerland
| | - Jochem Alsenz
- Roche Pharmaceutical Research and Early Development, Pre-Clinical CMC, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd, Basel, Switzerland
| | - Martin Kuentz
- University of Applied Sciences and Arts Northwestern Switzerland, School of Life Sciences, Institute of Pharma Technology, Muttenz, Switzerland
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17
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Saeed R, Usman M, Mansha A, Rasool N, Naqvi SAR, Zahoor AF, Rahman HMA, Rana UA, Al-Zahrani E. Partitioning of structurally related thiophene derivatives between solvent and micellar media of anionic surfactant sodium dodecyl sulphate. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2016.10.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Hanif S, Usman M, Hussain A, Rasool N, Khan A, Jamal MA, Elgorban AM, Rana UA. Spectroscopic study of benzothiophene partitioning in sodium dodecyl sulfate and cetyl trimethyl ammonium bromide micellar media. J SURFACTANTS DETERG 2016. [DOI: 10.1007/s11743-016-1852-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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19
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Mahmood K, Shakeel M, Siddiq M, Usman M. Thermodynamic Solution Properties of Benzalkonium Chloride in Aqueous and Ethanolic Media and its Interactions with Organized Assemblies of Anionic Surfactant Sodium Dodecyl Sulphate and Amino Acids. TENSIDE SURFACT DET 2016. [DOI: 10.3139/113.110425] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
AbstractThis manuscript reports the physicochemical behaviour of antimicrobial cationic surfactant benzalkonium chloride (BAC) as well as its interaction with the anionic surfactant sodium dodecyl sulfate in term of mixed micelle. Surface activity of pure BAC was studied by measuring the surface parameters i. e. surface pressure (Π), surface excess concentration (Γ), area per molecule and standard Gibbs free energy of adsorption (ΔGads). The electrical conductivity was measured to calculate the thermodynamic parameters like free energy of micellization, ΔGm, enthalpy of micellization, ΔHm and entropy of micellization, ΔSm. The interaction of the drug with sodium dodecyl sulfate was studied, in term of mixed micelle, by electrical conductivity and UV/Visible spectroscopy. Spectroscopic method helps to calculate the partition coefficient (Kx) and free energy of partition, while the conductivity method is helpful to calculate thermodynamic parameters of their interaction. The effect of different amino acids on CMC of BAC has also been studied.
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Affiliation(s)
- Khalid Mahmood
- 1Department of Chemistry, Hazara University, Mansehra, (KPK) Pakistan
| | - Muhammad Shakeel
- 1Department of Chemistry, Hazara University, Mansehra, (KPK) Pakistan
- 2Department of Chemistry, Govt. Postgraduate College Mandian, Abbottabad, (KPK) Pakistan
| | - Mohammad Siddiq
- 3Department of Chemistry, Quaid-e-Azam University, Islamabad-45320, Pakistan
| | - Muhammad Usman
- 4Department of Chemistry, Government College University Faisalabad-38000, Pakistan
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20
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Bhattacharya DM, Pratap UR, Wankhade AV, Zodape SP. Volumetric and ultrasonic approach in the investigation of critical micellar phenomenon of amphiphilic drugs in aqueous solutions at different temperatures. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2015.11.039] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Aggregation properties of levofloxacin in water and ethanol and its interaction with sodium dodecyl sulphate: A thermodynamic study. J CHEM SCI 2015. [DOI: 10.1007/s12039-015-0975-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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Hanif S, Usman M, Hussain A, Rasool N, Zubair M, Rana UA. Solubilization of Benzothiazole (BNZ) by micellar media of Sodium dodecyl sulphate and Cetyl trimethylammonium bromide. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.06.018] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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23
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Thermodynamic and spectroscopic investigation of interactions between reactive red 223 and reactive orange 122 anionic dyes and cetyltrimethyl ammonium bromide (CTAB) cationic surfactant in aqueous solution. ScientificWorldJournal 2014; 2014:540975. [PMID: 25243216 PMCID: PMC4163323 DOI: 10.1155/2014/540975] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Revised: 07/12/2014] [Accepted: 07/17/2014] [Indexed: 11/22/2022] Open
Abstract
The present study describes the conductometric and spectroscopic study of the interaction of reactive anionic dyes, namely, reactive red 223 and reactive orange 122 with the cationic surfactant cetyltrimethyl ammonium bromide (CTAB). In a systematic investigation, the electrical conductivity data was used to calculate various thermodynamic parameters such as free energy (ΔG), enthalpy (ΔH), and the entropy (ΔS) of solubilization. The trend of change in these thermodynamic quantities indicates toward the entropy driven solubilization process. Moreover, the results from spectroscopic data reveal high degree of solubilization, with strong interactions observed in the cases of both dyes and the CTAB. The spontaneous nature of solubilization and binding was evident from the observed negative values of free energies (ΔGp and ΔGb).
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Solubilization of reactive blue 19 by the micelles of cationic surfactant Cetyltrimethyl ammonium bromide (CTAB). J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.03.038] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Usman M, Siddiq M. Probing the micellar properties of Quinacrine 2HCl and its binding with surfactants and human serum albumin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 113:182-190. [PMID: 23727671 DOI: 10.1016/j.saa.2013.04.089] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2012] [Revised: 08/30/2012] [Accepted: 04/24/2013] [Indexed: 06/02/2023]
Abstract
This manuscript reports physicochemical behavior of an antimalarial drug Quinacrine 2HCl (QUN) drug as well as its interaction with surfactant and Human Serum Albumin (HSA). Surface tension and specific conductivity were employed to detect the critical micelle concentration (CMC) and thus its surface and thermodynamic parameters were calculated. Solublization of this drug within micelles of anionic surfactant sodium dodecyl sulfate (SDS) has also been studied. UV/Visible spectroscopy was used to calculate partition coefficient (Kx), free energy of partition and number of drug molecules per micelle. The complexation of drug with HSA at physiological conditions (pH 7.4) has been analyzed by using UV/Visible and fluorescence spectroscopy. In this way the values of drug-protein binding constant, number of binding sites and free energy of binding were calculated.
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Affiliation(s)
- Muhammad Usman
- Department of Chemistry, Government College University, Faisalabad, Pakistan
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Khan A, Farooqi ZH, Siddiq M. Associative properties of hydrophilic tip modified oxyethylene-oxybutylene diblock copolymers in aqueous media: Effect of end-group. J Appl Polym Sci 2011. [DOI: 10.1002/app.35131] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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