Microporous poly(vinyl methyl ether) hydrogels prepared by γ-ray irradiation at different heating rates
| Autor: | Ryoichi Kishi, Hideyuki Kihara, Toshiaki Miura, Hisao Ichijo |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
chemistry.chemical_classification
Radiation Aqueous solution Materials science technology industry and agriculture Ether Microporous material Polymer Lower critical solution temperature chemistry.chemical_compound chemistry Chemical engineering Polymer chemistry Self-healing hydrogels Irradiation Porosity |
| Zdroj: | Radiation Physics and Chemistry. 72:679-685 |
| ISSN: | 0969-806X |
| DOI: | 10.1016/j.radphyschem.2004.05.049 |
| Popis: | We prepared thermoresponsive and microporous polymer hydrogels by γ -ray irradiation of aqueous solutions poly(vinyl methyl ether) (PVME) at different heating rates. Under all temperature programs, opaque and heterogeneous PVME gels formed, which swelled at temperatures below the lower critical solution temperature and shrank at temperatures above it. All of the samples contained porous and phase-separated structures. The shape and size of the gel pores varied depending on the temperature programs. Gels having a sponge-like continuous porous structure formed only when the radiation-induced crosslinking was carried out at an optimum heating rate, which we found to be 0.11–0.13°C min −1 . For temperature changes between 10°C and 40°C, gels with this structure showed rapid volume transitions on a time scale of about a minute. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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