ABSTRACT:A variety of fluoroalkyl end-capped 3- [N-(3-acrylamido)propyl-N,N-dimethylammonio]propanesulfonate polymers [R F -(APDAPS) n -R F ] were prepared by the reactions of fluoroalkanoyl peroxides with the corresponding monomer under very mild conditions. Similarly, fluoroalkyl end-capped 2-vinylpyridinio propane sulfonate polymer was obtained by the use of fluoroalkanoyl peroxide. These fluoroalkyl end-capped sulfobetaine polymers exhibited a good solubility in water; however, these polymers have a poor solubility in other solvents. In particular, R F -(AP-DAPS) n -R F polymers caused gelation in methanol, although R F -(VPPA) n -R F polymer showed no gelation in methanol. R F -(APDAPS) n -R F polymers were found to form the selfassembled molecular aggregates with the aggregations of the end-capped fluoroalkyl segments and the ionic interactions between sulfobetaine segments in aqueous solutions. On the other hand, it was suggested that R F -2-vinylpyridinio propane sulfonate (VPPS) n -R F polymer is not likely to form the self-assemblies in aqueous solutions because of the steric hindrance of pyridiniopropyl betaine units in polymer. We also studied the surfactant properties of R F -(AP-DAPS) n -R F and R F -(VPPS) n -R F polymers compared with those of other fluoroalkyl end-capped betaine-type polymers such as 2-acrylamido-2-methylpropanesulfonic acid polymers and 2-(3-acrylamidopropyldimethylammonio) ethanoate polymers.
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