A Fourier transform infrared study of the phase transition in aqueous solutions of ethylene oxide-propylene oxide triblock copolymer

被引：78

作者：

Guo, C ^{[1
]}

Liu, HZ ^{[1
]}

Chen, JY ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Chem Met, Young Scientist Lab Separat Sci & Engn, Beijing 100080, Peoples R China

来源：

COLLOID AND POLYMER SCIENCE | 1999年 / 277卷 / 04期

关键词：

poly(ethylene oxide); poly(propylene oxide); triblock copolymer; Fourier transform infrared; spectroscopy; micelle;

D O I：

10.1007/s003960050395

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：

The phase transition between unimer and micellar phases of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymer Pluronic P105 in aqueous solution has been investigated as a function of temperature using Fourier transform infrared spectroscopy. The transition of 8 wt% Pluronic P105 in aqueous solution was found to occur at 25 degrees C. As temperature increases, PO blocks appear to be stretched conformers with strong interchain interaction, and the formation of a hydrophobic core in the micellar phase. The EO chains are found to change to a more disordered structure with low-chain packing density from the unimer phase to the micellar phase, Both the EO and PO blocks exhibit dehydration during the phase transition.

引用

页码：376 / 381

页数：6

共 20 条

[1] MICELLIZATION OF POLY(ETHYLENE OXIDE)-POLY(PROPYLENE OXIDE)-POLY(ETHYLENE OXIDE) TRIBLOCK COPOLYMERS IN AQUEOUS-SOLUTIONS - THERMODYNAMICS OF COPOLYMER ASSOCIATION [J].