| Full text | |
| Author(s): |
Total Authors: 2
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| Affiliation: | [1] Univ Estadual Campinas, Inst Chem, POB 6154, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 1
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| Document type: | Journal article |
| Source: | MACROMOLECULAR MATERIALS AND ENGINEERING; v. 306, n. 11 AUG 2021. |
| Web of Science Citations: | 1 |
| Abstract | |
Poly(sucrose methacrylate-co-acrylic acid), P(SMA-co-AA), and poly(sucrose methacrylate-co-diethylene glycol methyl ether methacrylate), P(SMA-co-EG(2)MA), are synthesized by free radical polymerization using sucrose dimethacrylate as a crosslinker. The copolymers present one glass transition suggesting a random distribution of the comonomers. The copolymers-water interaction parameter chi is around 0.5, while M-c increases with SMA molar fraction. The kinetics of water swelling show a Fickian behavior for P(SMA-co-AA) richer in acrylic acid. The swelling is driven by the ionic character of the P(SMA-co-AA), except at pH = 2, and by the hydrophilicity of the SMA for the P(SMA-co-EG(2)MA). The temperature influences the swelling behavior of the P(SMA-co-EG(2)MA) due to the lower critical solution temperature (LCST) behavior. The pH- and thermoresponsiveness of the P(SMA-co-AA) and P(SMA-co-EG(2)MA) hydrogels are maintained by replacing the sensitive comonomers with SMA up to mass fractions of 85 and 20 wt%, respectively, approximate to 71 and 17 wt% of sucrose, a product from a renewable resource. The hydrolytic degradation of the hydrogels is more pronounced for copolymers richer in SMA and resulted in sucrose release. Hydrogels present viscoelastic behavior, and the P(SMA-co-AA) series is more resistant to compression. The xerogels of the copolymers richer in SMA show a foam-like morphology with open cells. (AU) | |
| FAPESP's process: | 15/25406-5 - Organizing matter: colloids formed by association of surfactants, polymers and nanoparticles |
| Grantee: | Watson Loh |
| Support Opportunities: | Research Projects - Thematic Grants |