1
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The effect and enhancement mechanism of hydrophobic interaction and electrostatic interaction on zwitterionic wormlike micelles. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129424] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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2
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Jiang JJ, Chau AKH, Wong MK, Leung FKC. Controlled Supramolecular Assembly of Gold (III) Amphiphiles in Aqueous Media. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jia-Jun Jiang
- The Hong Kong Polytechnic University Department of Applied Biology and Chemical Technology HONG KONG
| | - Anson Kwok-Hei Chau
- The Hong Kong Polytechnic University Department of Applied Biology and Chemical Technology Hong Kong HONG KONG
| | - Man-Kin Wong
- The Hong Kong Polytechnic University Department of Applied Biology and Chemical Technology HONG KONG
| | - Franco King Chi Leung
- The Hong Kong Polytechnic University Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom, Kowloon xxx Hong Kong HONG KONG
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3
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Fetin P, Zorin I, Lezov A, Fetina V, Bilibin AY. Impact of counterions on micelle formation and polymerization of 11-acryloyloxyundecyltrimethylammonium surfactants. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113103] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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4
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Silva KN, Novoa-Carballal R, Drechsler M, Müller AH, Penott-Chang EK, Müller AJ. The influence of concentration and pH on the structure and rheology of cationic surfactant/hydrotrope structured fluids. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2015.10.054] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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5
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Hsu SH, Hung KC, Lin YY, Su CH, Yeh HY, Jeng US, Lu CY, Dai SA, Fu WE, Lin JC. Water-based synthesis and processing of novel biodegradable elastomers for medical applications. J Mater Chem B 2014; 2:5083-5092. [DOI: 10.1039/c4tb00572d] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel biodegradable nanoelastomers are synthesized. They can self-assemble and generate morphologies in nanometric, micrometric, or bulk scale with tunable properties. They are smart biodegradable materials with potential applications.
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Affiliation(s)
- Shan-hui Hsu
- Institute of Polymer Science and Engineering
- National Taiwan University
- Taipei, Taiwan
| | - Kun-Che Hung
- Institute of Polymer Science and Engineering
- National Taiwan University
- Taipei, Taiwan
| | - Ying-Yi Lin
- Institute of Polymer Science and Engineering
- National Taiwan University
- Taipei, Taiwan
| | - Chiu-Hun Su
- Material and Chemical Research Laboratories
- Industrial Technology Research Institute
- Hsinchu, Taiwan
| | - Hsi-Yi Yeh
- Institute of Polymer Science and Engineering
- National Taiwan University
- Taipei, Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center
- Hsinchu, Taiwan
| | - Chun-Yi Lu
- Institute of Polymer Science and Engineering
- National Taiwan University
- Taipei, Taiwan
| | - Shenghong A. Dai
- Department of Chemical Engineering
- National Chung Hsing University
- Taichung, Taiwan
| | - Wei-En Fu
- National Measurement Laboratory
- Center for Measurement Standards
- Industrial Technology Research Institute of Taiwan/National Measurement Laboratory
- Hsinchu, Taiwan
| | - Jui-Che Lin
- Department of Chemical Engineering
- National Cheng Kung University
- Tainan, Taiwan
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6
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Singh K, Dharaiya N, Marangoni DG, Bahadur P. Dissimilar effects of solubilized p-toluidine on the shape of micelles of differently charged surfactants. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.06.038] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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7
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Wattebled L, Note C, Laschewsky A. Structure – Property Relationships of “Gemini” Surfactants and Synergism with Hydrotropes. TENSIDE SURFACT DET 2013. [DOI: 10.3139/113.100325] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Two series of cationic dimeric ((gemini)) surfactants are presented with respect to key surfactant properties, such as surface activity and micellization. The influence of the dimerization and of the spacer group are examined, in order to establish structure-property relationships. Importantly, the addition of organic anions strongly modifies the solution properties and aggregate morphology. The surface tension and critical micellar concentration can be markedly reduced compared to the dimeric surfactants in the pure state. Moreover, dimeric surfactants with an appropriate spacer group can produce viscoelastic solutions after addition of certain organic anions even when bearing only dodecyl chains, whereas no effect is observed for such mixtures involving the analogous (monomeric) surfactant. Also, first results on the use of polymerizable counterions and their polymerization in such mixtures are presented.
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Affiliation(s)
- L. Wattebled
- Universität Potsdam, Institut für Chemie, Karl Liebknecht Str. 24-25, D-14476 Golm
| | - C. Note
- Universität Potsdam, Institut für Chemie, Karl Liebknecht Str. 24-25, D-14476 Golm
| | - A. Laschewsky
- Universität Potsdam, Institut für Chemie, Karl Liebknecht Str. 24-25, D-14476 Golm
- Fraunhofer Institut für Angewandte Polymerforschung, P.O. Box 600651, D-14406 Potsdam
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8
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FitzGerald PA, Warr GG. Structure of polymerizable surfactant micelles: insights from neutron scattering. Adv Colloid Interface Sci 2012; 179-182:14-21. [PMID: 22795776 DOI: 10.1016/j.cis.2012.06.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 05/11/2012] [Accepted: 06/21/2012] [Indexed: 11/25/2022]
Abstract
Although polymerization of reactive surfactants (surfmers) in micelles and other self-assembled phases has been studied for at least 30 years, the last decade or so has seen substantial advances in understanding both the structure and dynamics of these systems. In this review we highlight the new insights yielded primarily by small-angle neutron scattering (SANS) using high-flux sources, the perspective this provides for realizing topochemical polymerization in micellar systems, and the prospects and new developments for further exploiting SANS in this field. We present some new neutron contrast variation results exemplifying these elements.
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FitzGerald PA, Chatjaroenporn K, Zhang X, Warr GG. Micellization of monomeric and poly-ω-methacryloyloxyundecyltrimethylammonium surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:11852-11859. [PMID: 21859132 DOI: 10.1021/la2028059] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have used small-angle neutron scattering to study how micelle morphology of the tail-polymerizable surfactants MUTAB and MUTAC (ω-methacryloyloxyundecyltrimethylammonium bromide and chloride) is affected by classic self-assembly modifiers such as temperature changes, salt addition, and counterion exchange, as a function of their conversion from monomer into polymer amphiphile in aqueous solution. Contrary to common assumptions about polymerized surfactants, these systems remain in dynamic equilibrium under all conditions examined and at all conversions (except for a small amount of high-molecular-weight precipitation by MUTAC). Counterintuitively, the polymerized methacrylate backbone has little influence on aggregate morphology, except for the formation of rod-like mixed micelles of polymerized and unpolymerized surfactant at intermediate conversions. The addition of salt produces a transition to rod-like micelles at all conversions except in the unpolymerized surfactant, which has some characteristics of an asymmetric bolaform surfactant and retains its spheroidal geometry under almost all conditions.
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Affiliation(s)
- Paul A FitzGerald
- School of Chemistry F11, The University of Sydney, New South Wales, 2006 Australia
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10
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Enthalpy measurements for the formation of salt-induced wormlike micelles using isothermal titration microcalorimetry. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.03.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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11
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Oikonomou E, Bokias G, Kallitsis JK, Iliopoulos I. Formation of hybrid wormlike micelles upon mixing cetyl trimethylammonium bromide with poly(methyl methacrylate-co-sodium styrene sulfonate) copolymers in aqueous solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:5054-5061. [PMID: 21446711 DOI: 10.1021/la200017j] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The association of cetyltrimethylammonium bromide, CTAB, with a series of P(MMAx-co-SSNa) random copolymers of sodium styrene sulfonate (SSNa) with methyl methacrylate (MMA) was explored in aqueous solution as a function of the MMA molar content, x, of the copolymers. The polyelectrolyte/surfactant complexation in aqueous solution was verified through pyrene fluorescence probing. In addition, turbidimetry studies in dilute or more concentrated aqueous solutions elucidated the phase separation behavior of the P(MMAx-co-SSNa)/CTAB systems as a function of the copolymer composition x and the surfactant to polyelectrolyte mixing charge ratio. It is found that practically phase separation is completely suppressed within the studied mixing range when the MMA content of the copolymers is ∼30-40 mol%. For lower MMA contents the polyelectrolyte/surfactant complex separates out from water, while for higher x values the solubility limits of the copolymers in water are attained. For the intermediate MMA contents, viscoelastic systems are obtained in more concentrated polymer/surfactant solutions provided that the polyelectrolyte is fully complexed with the cationic surfactant ((1)H NMR results). Moreover, the (1)H NMR studies indicate that hybrid P(MMAx-co-SSNa)/CTAB wormlike micelles are formed in water under these conditions. Finally, it is shown that addition of salt prevents syneresis problems and facilitates the rheological investigation.
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Affiliation(s)
- E Oikonomou
- Department of Chemistry, University of Patras, GR-26504 Patras, Greece
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12
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Piogé S, Nesterenko A, Brotons G, Pascual S, Fontaine L, Gaillard C, Nicol E. Core Cross-Linking of Dynamic Diblock Copolymer Micelles: Quantitative Study of Photopolymerization Efficiency and Micelle Structure. Macromolecules 2011. [DOI: 10.1021/ma102284y] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sandie Piogé
- Polymères, Colloïdes, Interfaces, UMR CNRS 6120, Université du Maine, Le Mans, France
- Unité de Chimie Organique Moléculaire et Macromoléculaire, UCO2M, UMR CNRS 6011, Université du Maine, Le Mans, France
| | - Alla Nesterenko
- Polymères, Colloïdes, Interfaces, UMR CNRS 6120, Université du Maine, Le Mans, France
- Unité de Chimie Organique Moléculaire et Macromoléculaire, UCO2M, UMR CNRS 6011, Université du Maine, Le Mans, France
| | - Guillaume Brotons
- Laboratoire de Physique de l′Etat Condensé, UMR CNRS 6087, Université du Maine, Le Mans, France
| | - Sagrario Pascual
- Unité de Chimie Organique Moléculaire et Macromoléculaire, UCO2M, UMR CNRS 6011, Université du Maine, Le Mans, France
| | - Laurent Fontaine
- Unité de Chimie Organique Moléculaire et Macromoléculaire, UCO2M, UMR CNRS 6011, Université du Maine, Le Mans, France
| | - Cédric Gaillard
- Laboratoire de Microscopie, plate-forme RIO BIBS, U.R. BIA, INRA, Nantes, France
| | - Erwan Nicol
- Polymères, Colloïdes, Interfaces, UMR CNRS 6120, Université du Maine, Le Mans, France
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13
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Rodríguez M, Xue J, Gouveia LM, Müller AJ, Sáez AE, Rigolini J, Grassl B. Shear rheology of anionic and zwitterionic modified polyacrylamides. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2010.10.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Chatjaroenporn K, Baker RW, FitzGerald PA, Warr GG. Polymerizable cationic micelles form cylinders at intermediate conversions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:11715-11719. [PMID: 20499925 DOI: 10.1021/la101159g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The structural evolution of micelles of the polymerizable surfactant omega-methacryloyloxyundecyltrimethylammonium bromide (MUTAB) during UV-initiated polymerization in aqueous micellar solution has been followed by small-angle neutron scattering. Although the micelles are short spheroids both before and after polymerization, a significant, distinct population of rodlike micelles develops during the reaction, which accounts for as much as 40 vol % of the micellized surfactant and coexists with the spheroids and dissolved monomer. These coexisting micelle populations are shown to remain in dynamic equilibrium throughout the reaction and can be understood by treating it as a ternary mixture of surfactant, amphiphilic polyelectrolyte, and water.
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15
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Structure changes in micelles and adsorbed layers during surfactant polymerization. J Colloid Interface Sci 2009; 336:449-54. [PMID: 19464021 DOI: 10.1016/j.jcis.2009.04.059] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2009] [Revised: 04/17/2009] [Accepted: 04/17/2009] [Indexed: 11/22/2022]
Abstract
We have studied the self-assembled structures formed by the cationic surfactant 11-(methacryloyloxy)undecyltrimethylammonium bromide (MUTAB) using small angle neutron scattering as it undergoes UV-initiated polymerization in bulk solution, and the subsequent adsorbed structures at the mica/solution interface using atomic force microscopy. MUTAB forms spheroidal aggregates in aqueous solution with an axial ratio of 2-3 both before and after polymerization, as previously reported in numerous studies. However, at intermediate conversions the micelles surprisingly form elongated structures up to 200 A long. Except for the unpolymerized MUTAB, which forms a featureless adsorbed layer, the micelle structures are largely retained after adsorption: structures are elongated at 50% conversion and globular at 100% conversion. These results demonstrate that the structure of the unpolymerized micelle is not simply kinetically-trapped during polymerization, but undergoes extensive reorganization as the reaction proceeds. This has implications for attempts to capture micellar structure by polymerization and use it to template nanostructured materials or for encapsulation.
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16
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Schwering R, Blom A, Warr GG. Laterally nanostructured adsorbed layers of surfactant/surfmer mixtures before and after polymerisation. J Colloid Interface Sci 2008; 328:227-32. [DOI: 10.1016/j.jcis.2008.09.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2007] [Revised: 09/04/2008] [Accepted: 09/04/2008] [Indexed: 10/21/2022]
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17
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Kuperkar K, Abezgauz L, Danino D, Verma G, Hassan P, Aswal V, Varade D, Bahadur P. Viscoelastic micellar water/CTAB/NaNO3 solutions: Rheology, SANS and cryo-TEM analysis. J Colloid Interface Sci 2008; 323:403-9. [DOI: 10.1016/j.jcis.2008.04.040] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2008] [Revised: 04/10/2008] [Accepted: 04/10/2008] [Indexed: 10/22/2022]
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18
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Nakamura K, Shikata T. Formation and Physicochemical Features of Hybrid Threadlike Micelles in Aqueous Solution. Chemphyschem 2007; 8:2568-74. [DOI: 10.1002/cphc.200700305] [Citation(s) in RCA: 13] [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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19
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Dreiss CÃCA. Wormlike micelles: where do we stand? Recent developments, linear rheology and scattering techniques. SOFT MATTER 2007; 3:956-970. [PMID: 32900044 DOI: 10.1039/b705775j] [Citation(s) in RCA: 555] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Wormlike micelles are elongated flexible self-assembly structures formed by the aggregation of amphiphiles. Above a threshold concentration, they entangle into a dynamic network, reminiscent of polymer solutions, and display remarkable visco-elastic properties, which have been exploited in numerous industrial and technological fields. Relating the microstructure of these intricate structures with their bulk properties is still an ongoing quest. In this review, we present a classification of wormlike micelles, with a focus on novel systems and applications. We describe the current state of understanding of their linear rheology and give a detailed account of recent progress in small-angle neutron scattering, a particularly powerful technique to elucidate their microstructure on a wide range of length-scales.
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Affiliation(s)
- CÃ Cile A Dreiss
- Pharmaceutical Science Research Division, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, UKSE1 9NH
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20
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21
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22
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Kuntz DM, Walker LM. Solution Behavior of Rod-Like Polyelectrolyte-Surfactant Aggregates Polymerized from Wormlike Micelles. J Phys Chem B 2007; 111:6417-24. [PMID: 17521180 DOI: 10.1021/jp0688308] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The behavior of a rod-like, water-soluble, polyelectrolyte-surfactant aggregate system (pC16TVB) in aqueous solution is characterized to determine the partitioning of surfactant in these systems and the impact on aggregate structure. These aggregates are generated by in situ polymerization of a cationic surfactant-hydrotrope wormlike micelle system. This system differs from most other polyelectrolyte-surfactant systems in that the monomer groups and the surfactant are present in ion pairs in the absence of added salts or counterions, so the stoichiometry (with respect to charge) is 1:1 for the system. Therefore, after polymerization the surfactant acts as the counterion for the polyelectrolyte chains as other counterions (salts) are not available. Despite being present in a 1:1 molar ratio, the aggregates are surprisingly stable in water (concentrations >600 mg/mL have been achieved). The conformation of the polyelectrolyte in the aggregate is analogous to the case of a polymer chain in tight confinement in a "tube" or cylindrical pore in which the pore walls are attractive--the tube is formed by the surfactant which is free to dissociate from the aggregates. A simple model for the structure and partitioning is presented and the ability to manipulate the aggregate structure is demonstrated.
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Affiliation(s)
- Daniel M Kuntz
- Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
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Ezrahi S, Tuval E, Aserin A. Properties, main applications and perspectives of worm micelles. Adv Colloid Interface Sci 2006; 128-130:77-102. [PMID: 17239810 DOI: 10.1016/j.cis.2006.11.017] [Citation(s) in RCA: 170] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This tutorial review deals with one of the most remarkable forms of surfactant aggregates, described as having a flexible, elongated cylindrical shape. Three structural scale lengths are pertinent to the flexibility and mobility of worm micelles: the cross-sectional radius, r(cs), the overall (contour) length, L, and the persistence length, l(p). The diversity of l(p) values in amphiphilic systems is demonstrated as well as the relation between L and l(p). The review also discusses the viscoelasticity of worm micelles and the relaxation mechanisms underlying this dominant property. Many aspects of viscoelasticity--such as non-linearity, shear banding, flow-induced phase transition, rheochaos--are only shortly described. The prevailing application of worm micelles, namely as fracture fluids and drag reducing agents are discussed in detail, stressing the effect of variations in the surfactant molecular structure on the efficacy of worm micelles. The vague possibility of using "smart" worm micelles in the foreseeable future is tersely outlined.
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Affiliation(s)
- S Ezrahi
- Materials and Chemistry Department, R and D and Project Management Unit, IDF, Israel
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Nakamura K, Shikata T. Anionic Hybrid Threadlike Micelle Formation in an Aqueous Solution. J Phys Chem B 2006; 110:24802-5. [PMID: 17149896 DOI: 10.1021/jp066424i] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Novel anionic hybrid threadlike micelle formation was found in an aqueous solution of an anionic surfactant, sodium tetradecylsulfate (NaC(14)S), and partially quarternized polyelectrolyte at ca. 0.55, poly(N,N-diallyl-N-methylamine-ran-N,N-diallyl-N-ethyl-N-methylammonium bromide) (P(DAM/DAEMBr)). The system precipitated insoluble complexes at a composition of iso-electric points, forming long and stable hybrid threadlike micelles at a composition close to an iso-molar point between NaC(14)S and P(DAM/DAEMBr) in monomer units. Then, the system turned into transparent liquids and showed remarkable viscoelasticity due to entanglements between the formed anionic hybrid threadlike micelles.
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Zhu Z, González YI, Xu H, Kaler EW, Liu S. Polymerization of anionic wormlike micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:949-55. [PMID: 16430253 DOI: 10.1021/la052384i] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Polymerizable anionic wormlike micelles are obtained upon mixing the hydrotropic salt p-toluidine hydrochloride (PTHC) with the reactive anionic surfactant sodium 4-(8-methacryloyloxyoctyl)oxybenzene sulfonate (MOBS). Polymerization captures the cross-sectional radius of the micelles (approximately 2 nm), induces micellar growth, and leads to the formation of a stable single-phase dispersion of wormlike micellar polymers. The unpolymerized and polymerized micelles were characterized using static and dynamic laser light scattering, small-angle neutron scattering, 1H NMR, and stopped-flow light scattering. Stopped-flow light scattering was also used to measure the average lifetime of the unpolymerized wormlike micelles. A comparison of the average lifetime of unpolymerized wormlike micelles with the surfactant monomer propagation rate was used to elucidate the mechanism of polymerization. There is a significant correlation between the ratio of the average lifetime to the monomer propagation rate and the average aggregation number of the polymerized wormlike micelles.
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Affiliation(s)
- Zhiyuan Zhu
- Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, Anhui Province, PR China
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