Thermo-reversible gelation of atactic poly(methyl methacrylate) in poly(ethylene glycol) oligomers
Yun Gao1, Chunhong Yu, Minzhi Chen
1Department of Polymer Science and Engineering, the School of Chemistry and Chemical Engineering, The State Key Laboratory of Coordination Chemistry, Nanjing University, 210093 Nanjing, P.R. China.
Abstract:
The temperature-concentration behavior of physical gel by atactic poly(methyl methacrylate) (aPMMA) in poly(ethylene glycol) oligomer (PEG400) was investigated. A liquid-liquid demixing interferes with a glass transition during cooling. The combination of demixing and T g leads to the formation of amorphous gels at low temperature. We suggest that the gelation of aPMMA/PEG400 is a glassy gel, in which short-range attractive depletion interaction in the polymer/oligomer system was the driving force at molecular level.
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