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Effet de la concentration sur la transition conformationnelle des copolymères séquencés et greffés

✍ Scribed by Dondos, Anastasios ;Benoît, Henri


Publisher
Wiley (John Wiley & Sons)
Year
1977
Weight
398 KB
Volume
178
Category
Article
ISSN
0025-116X

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✦ Synopsis


Abstract

In this paper we have been studying the effect of concentration c on reduced viscosity η~sp~/c for a triblock copolymer poly(methyl methacrylate)/polystyrene/poly(methyl methacrylate) and for a graft copolymer of the same nature.

The temperature of the experiments has been chosen in the range where the conformation changes from a segregated form to a pseudogaussian one. For this temperature range η~sp~/c is not a linear function of concentration but the points η~sp~/c vs. c are situated on two straight line segments with a well defined intercept.

We discuss the phenomenon in comparison to results obtained on mixtures of homopolymers. These results suggest a strong and anomalous dependance of molecular conformation on concentration.


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