Polymerization of Acrylamide in the Presence of Tetradecyltrimethylammonium Bromide Surfactant

Chakrapani, Mukundan; Rill, Randolph L.; Winkle, David H. Van

doi:10.1021/ma034814m

Cited by 4 publications

(3 citation statements)

References 23 publications

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“…In recent years, these type of studies have achieved great attention, , but only in a few cases is the parent structure maintained after polymerization. , Usually, the final hydrogel has a structure dramatically different from that of the initial system, because monomer consumption on one hand, and polymer formation on the other, strongly influence the morphology obtained. The polymer chains tend to coil and do not easily adapt to confined geometries, but even when the template of the original structure is not obtained, a new interesting morphology usually appears, and the studies reveal that the generated morphology depends on the type of monomer and on the mesophase structure …”

Section: Introductionmentioning

confidence: 99%

“…In recent years, these type of studies have achieved great attention, 4,5 but only in a few cases is the parent structure maintained after polymerization. 6,7 Usually, the final hydrogel has a structure dramatically different from that of the initial system, because monomer consumption on one hand, and polymer formation on the other, strongly influence the morphology obtained.…”

Section: Introductionmentioning

confidence: 99%

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Macroporous Gels of Poly(N,N-dimethylacrylamide) Obtained in the Lamellar System AOT/Water

2004

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Dimethylacrylamide and N,N′-methylenebis(acrylamide) are copolymerized in the lyotropic AOT/water medium to yield several types of macroporous hydrogels. These gels are formed in two different macroscopic phases of the reacting system. The morphology of the gels, once isolated, is widely different depending on the macroscopic phase in which they were formed. Inside each phase, the polymerization induces an additional microscopic phase separation, with the result of deswelling of the original lamellar AOT/water structure. The morphology of the isolated gels is not a copy of this original nanostructure, instead, it has features whose length scales are larger than those of the starting phases. More complex morphological patterns develop in the presence of surfactant, as a result of the phase separation process. The type of morphology appears to be correlated with the proportion of water contained in the macroscopic phases. The swelling of the isolated gels in water does not follow the increase with chain length between cross-links predicted by network theory, probably because of the contribution from the macropores.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Macroporous Gels of Poly(N,N-dimethylacrylamide) Obtained in the Lamellar System AOT/Water

2004

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“…Several other methods have been proposed to obtain macroporous or sponge hydrogels. Among them are: freezing polymerization of cryogels;28 crosslinking polymerization in the presence of porogens,13, 29–35 which template the formation of polymer (as lamellar mesophases)32–34 and must be taken out of the system after polymerization; grafting hydrophilic chains on the polymer network;36, 37 and foaming or creation of bubbles during gelation 38–40. Here, we propose a very simple method to create macropores on the scale of millimetres.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of solvent responsiveness in poly(N,N‐dimethylacrylamide) hydrogels of different morphology

Pastoriza

Pacios

Piérola

2005

Polymer International

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Crosslinked poly(N,N-dimethylacrylamide) hydrogel samples were synthesized with various total comonomer concentrations and crosslinker ratios in the reacting mixture, and at two different temperatures: room temperature and the boiling point of the reacting mixture, about 80 • C. During gelation of samples prepared at the higher temperature, the bubbles of the boiling system were trapped in positions homogeneously distributed, and post-gel reactions fixed them. These samples were macroporous, showing about three times the swelling capacity of conventional hydrogels synthesized at room temperature with the same composition. Both types of hydrogel swollen at equilibrium in water deswelled exponentially with time when they were immersed in acetone or dioxane. The rate of shrinking was higher for macroporous than for conventional samples and it was smaller in dioxane, the solvent with higher viscosity (η), although there was no proportionality to the solvent fluidity, η −1 . The morphology, which was in the scale of micrometres (as revealed by scanning electron microscopy), played a minor role in the shrinking rates of both types of gels. The excess swelling and the faster solvent response of macroporous gels were ascribed to the store and draining capacity of macropores at the millimetre scale.

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Effect of type and concentration of surfactants on swelling behavior of poly[N-[3-(dimethylamino)propyl]methacrylamide-co- N,N-methylenebis(acrylamide)] hydrogels

2005

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Polymerization of Acrylamide in the Presence of Tetradecyltrimethylammonium Bromide Surfactant

Cited by 4 publications

References 23 publications

Macroporous Gels of Poly(N,N-dimethylacrylamide) Obtained in the Lamellar System AOT/Water

Macroporous Gels of Poly(N,N-dimethylacrylamide) Obtained in the Lamellar System AOT/Water

Kinetics of solvent responsiveness in poly(N,N‐dimethylacrylamide) hydrogels of different morphology

Effect of type and concentration of surfactants on swelling behavior of poly[N-[3-(dimethylamino)propyl]methacrylamide-co- N,N-methylenebis(acrylamide)] hydrogels

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