Temperature-dependent aggregation and disaggregation of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) block copolymer in aqueous solution

被引：55

作者：

Liang, Xiangfeng ^{[1
]}

Guo, Chen ^{[1
]}

Ma, Junhe ^{[1
]}

Wang, Jing ^{[1
]}

Chen, Shu ^{[1
]}

Liu, Huizhou ^{[1
]}

机构：

[1] Chinese Acad Sci, Grad Univ, Inst Proc Engn, State Key Lab Biochem Engn,Lab Seperat Sci & Engn, Beijing 100080, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2007年 / 111卷 / 46期

关键词：

D O I：

10.1021/jp074990n

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Aggregation and disaggregation of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers, Pluronics P103 and P104, in aqueous solutions during a heating and cooling cycle were investigated by dynamic laser scattering (DLS) and H-1 NMR spectroscopy. Temperature hysteresis was observed by DLS when cooling the copolymer aqueous solutions because larger aggregates existed at temperatures lower than critical micellization temperature (CMT), but no temperature differences were observed by NMR. This phenomenon was explained as the forming of water-swollen micelles at temperatures lower than CMT during the cooling process.

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收藏

页码：13217 / 13220

页数：4

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