Colloidal phase separation of concentrated PNIPAm solutions

被引：54

作者：

Balu, Caroline

Delsanti, Michel

Guenoun, Patrick ^{[1
]}

Monti, Fabrice

Cloitre, Michel

机构：

[1] CEA Saclay, SCM, LIONS, F-91191 Gif Sur Yvette, France

[2] ESPCI, CNRS, UMR 7167, Lab Mat Molle & Chim, F-75321 Paris, France

来源：

LANGMUIR | 2007年 / 23卷 / 05期

关键词：

D O I：

10.1021/la0627821

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In the concentration range of 1-6 wt %, solutions of a thermosensitive polymer (poly-N-isopropylacrylamide (PNIPAm), M-w = 1.4 x 10(5) g center dot mol(-1)) are shown to phase separate in the form of dense stable colloids of nearly pure polymer. Diffuse wave spectroscopy and small-angle neutron scattering both provide consistent measurements of the colloidal size as a function of temperature. Results are in agreement with a Cahn regime of spinodal decomposition blocked at an early stage, prior to a growth that would lead to a macroscopic phase separation.

引用

页码：2404 / 2407

页数：4

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