Article

Colloidal phase separation of concentrated PNIPAm solutions.

LIONS, SCM-C.E.A. Saclay, F-91191 Gif sur Yvette Cedex, France.
Langmuir (impact factor: 4.19). 03/2007; 23(5):2404-7. DOI:10.1021/la0627821 pp.2404-7
Source: PubMed

ABSTRACT In the concentration range of 1-6 wt %, solutions of a thermosensitive polymer (poly-N-isopropylacrylamide (PNIPAm), Mw = 1.4 x 10(5) g.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. [Early results of this work were presented at the 231st American Chemical Society National Meeting, Symposium on Amphiphilic Polymers, Atlanta, GA, 2006, March 26-30.].

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Keywords

231st American Chemical Society National Meeting
 
[Early results
 
Amphiphilic Polymers
 
Cahn regime
 
colloidal size
 
concentration range
 
consistent measurements
 
dense stable colloids
 
Diffuse wave spectroscopy
 
GA
 
macroscopic phase separation
 
phase separate
 
small-angle neutron scattering
 
thermosensitive polymer
 

Caroline Balu