SANS from poly(ethylene oxide)/water systems

被引：164

作者：

Hammouda, B ^{[1
]}

Ho, D ^{[1
]}

Kline, S ^{[1
]}

机构：

[1] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA

来源：

MACROMOLECULES | 2002年 / 35卷 / 22期

关键词：

D O I：

10.1021/ma011657n

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The poly(ethylene oxide) (PEO)/water system is investigated using small-angle neutron scattering (SANS). This system associates to form hydrogen-bonded clusters at high enough concentrations. Two correlation lengths are observed: one long range representing cluster sizes and the other short range representing polymer chain correlations. Clusters are formed at a volume fraction of 4% hPEO in D2O. An LCST transition is obtained between a mixed phase (through hydrogen bonding) and a demixed two-phase region. Solvent deuteration is seen to enhance hydrogen bonding. Deuteration of the polymer backbone is seen to enhance hydrophobic interactions. The average polymer contrast match method fails due to the isotopic dependence of specific interactions. Pressure was seen to lower the LCST by breaking hydrogen bonds. At even higher temperature (beyond the boiling point of water) a UCST transition was observed.

引用

页码：8578 / 8585

页数：8

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