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Lattice Simulation of Mixtures of Flexible and Semi-Flexible Chains

Published online by Cambridge University Press:  26 February 2011

P. Cifra ,
F.E. Karasz  and
W.J. Macknight
P. Cifra
Affiliation:
Polymer Institute, Slovak Academy of Science, 842 36 Bratislava Czechoslovakia
F.E. Karasz
Affiliation:
Department of Polymer Science & Engineering, University of Massachusetts, Amherst, MA 01003, USA
W.J. Macknight
Affiliation:
Department of Polymer Science & Engineering, University of Massachusetts, Amherst, MA 01003, USA
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Abstract

Miscibility behavior in a binary polymer mixture composed of flexible and semiflexible chains has been examined by Monte Carlo simulations on a cubic lattice. It is shown that as the flexibility of one component in an initially miscible mixture of flexible chains of both kinds is reduced the miscibility of the system is not necessarily lost. In fact, flexible chains in the mixture can adjust to this situation and the equilibrium number of segmental contacts between the blend components is retained. The situation is changed in systems in which the loss of flexibility is coupled with an aggregation tendency of the semiflexible chains. The disparity between blend components due to the presence of orientational correlations between the semiflexible chains to a certain extent drives the system towards demixing. However, the dominant role in miscibility behavior in mixtures of flexible and semiflexible chains is played by intermolecular interactions between blend components.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 134: Symposium J – Materials Science and Engineering of Rigid-Rod Polymers , 1988 , 235
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

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