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论文类型：期刊论文

发表时间：2015-02-10

发表刊物：MACROMOLECULES

收录刊物：SCIE、EI、Scopus

卷号：48

期号：3

页面范围：645-654

ISSN号：0024-9297

摘要：Hydrophobic/hydrophilic triblock copolymers of poly(2-(N-ethylperfluorooctanesulfonamido)ethylmethyl acrylate) and poly(N,N'-dimethylacrylamide) (PD) were synthesized by sequential reversible additionfragmentation chain transfer polymerization. Physically cross-linked hydrogels were produced by immersing compression-molded triblock copolymers into water. The copolymers and their hydrogels were characterized by differential scanning calorimetry, thermogravimetric analysis, thermal desorption-GC/MS analysis, swelling isotherms, wide- and small-angle X-ray scattering, and dynamic mechanical analysis. The equilibrium water sorption of the hydrogels depended on the length of the water-soluble polymer block (PD), and the block copolymers swelled more in water than a random copolymer of the same composition. The block copolymer hydrogels were viscoelastic, though the frequency dependence of the dynamic modulus was weak. The dynamic modulus of the block copolymer hydrogels ranged from similar to 10(3) to 4 x 10(4) Pa, which was much lower than the modulus of a random copolymer hydrogel of the same composition.