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논문 기본 정보

자료유형
학술저널
저자정보
Kim, Jin Young (Department of Chemistry and Nano Science, Ewha Womans University) Moon, Hyo Jung (Department of Chemistry and Nano Science, Ewha Womans University) Ko, Du Young (Department of Chemistry and Nano Science, Ewha Womans University) Jeong, Byeongmoon (Department of Chemistry and Nano Science, Ewha Womans University)
저널정보
테크노프레스 Biomaterials and biomedical engineering Biomaterials and biomedical engineering 제2권 제1호
발행연도
2015.1
수록면
15 - 22 (8page)

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Poly(ethylene glycol) end-capped with pentafluorophenyl group(s) in ABA (FP-PEG-FP) and AB (mPEG-FP) types were prepared. Even though they were similar in composition, the lower critical solution temperature (LCST) of FP-PEG-FP was observed at $23^{\circ}C$, whereas that of mPEG-FP was observed at $65^{\circ}C$. To understand the large difference in solution behaviour of the two polymers, UV-VIS spectroscopy, microcalorimetry, 1H-NMR spectroscopy, and dynamic light scattering were used. FP-PEG-FP has two hydrophobic pentafluorophenyl groups at the ends of hydrophilic PEG (1000 Daltons), whereas mPEG-PF has a highly dynamic PEG (550 Daltons) block that are anchored to a hydrophobic pentafluorophenyl group. PF-PEG-PF not only has a smaller conformational degree of freedom than mPEG-PF but also can form extensive intermolecular aggregates, therefore, PF-PEG-PF exhibits a significantly lower LCST than mPEG-PF. This paper suggests that topological control is very important in designing a temperature-sensitive polymer.

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