期刊
ACS MACRO LETTERS
卷 4, 期 12, 页码 1366-1369出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.5b00771
关键词
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资金
- Ministry of Education, Science, Sports and Culture [24245026, 26410134, 24750104]
- Sumitomo Foundation [131302]
- Research Institute for Production Development
- Japan Society for the Promotion of Sciences (JSPS) [DC1:24-6140]
- Grants-in-Aid for Scientific Research [26410134] Funding Source: KAKEN
Poly[poly(ethylene glycol) methyl ether methacrylate]s [poly(PEGMA)s] sharply and reversibly exhibited lower critical solution temperature (LCST)-type phase separation in 2H,3H-perfluoropentane (2HPFP). The cloud points decreased from 52 to 41 degrees C with increasing the PEG pendant length [-(CH2CH2O)(m)CH3: m = 4.5, 9, 19]. The cloud point was precisely controlled via the addition of perfluoroalkanes (e.g., perfluorooctane) to the 2HPFP solution: typically, it was inversely proportional to the amount of perfluorooctane in the mixture. The unique thermoresponsive solubility further afforded the temperature-mediated micellization of a block copolymer of PEG19MA and methyl methacrylate (MMA) in 2HPFP to uniquely give a PEG-core micelle with PMMA shell. Therefore, the LCST phase separation properties in the hydrofluorocarbon would open new vistas for thermoresponsive polymeric materials.
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