Colloidal phase separation of concentrated PNIPAm solutions |
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Authors: | Balu Caroline Delsanti Michel Guenoun Patrick Monti Fabrice Cloitre Michel |
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Institution: | LIONS, SCM-C.E.A. Saclay, F-91191 Gif sur Yvette Cedex, France. |
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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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