Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2015-02-10

Journal: MACROMOLECULES

Included Journals: Scopus、EI、SCIE

Volume: 48

Issue: 3

Page Number: 645-654

ISSN: 0024-9297

Abstract: 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.