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Conformational transitions in solutions of block copolymers in mixed solvents

✍ Scribed by J.R. Urwin; M. Girolamo

Publisher
Elsevier Science
Year
1971
Tongue
English
Weight
333 KB
Volume
7
Category
Article
ISSN
0014-3057

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✦ Synopsis

Air,watt--Intrinsic viscosity vs. composition curves of block copolymers of polyisoprene and polystyrene in a mixed solvent (cyclohexane q-n-heptane) show a transition at a critical composition (Yc) provided the temperature of the system is above a conformational transition temperature (T)) found previously in [7] vs. Tplots in the single solvent cyclohexane. The plots of [1] vs. y at temperature below T) show no such discontinuity. It is proposed that ~,Β’ represents the composition of the mixed solvent for which T, is the same as the experimental temperature or a solvent of composition yΒ’ would show a conforrnational transition Tp = T where T is the temperature of the system.

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