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Physical Studies of A Series of Main-Chain Liquid CrystallinePolymers With Long Soft Segment

Published online by Cambridge University Press:  15 February 2011

Bing Wu ,
C. Peter Lillya  and
Richard S. Stein
Bing Wu
Affiliation:
University of Massachusetts, Chemistry Department, Amherst, MA 01003
C. Peter Lillya
Affiliation:
University of Massachusetts, Chemistry Department, Amherst, MA 01003
Richard S. Stein
Affiliation:
University of Massachusetts, Chemistry Department, Amherst, MA 01003
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Abstract

A series of Main-chain liquid crystalline polymers with long andpolydisperse soft segments has been synthesized. The thermal properties ofthese polymers have been characterized by differential scanning calorimetry,optical microscopy and wide angle X-ray diffraction. Unexpectedly, thesepolymers have a strong tendency to form purely smectic Mesophases. Thedegree of ordering of these polymeric mesophases is Much higher than that ofthe mesophase formed by a low molecular weight Model compound with the sameMesogen. The soft segment length effects on thermal behavior of suchsegmented copolymers have been elucidated. A semi-quantitative theory hasbeen formulated to interpret these observations. A phase diagram relatingthermal properties to soft segment length has been proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 87
Copyright
Copyright © Materials Research Society 1994

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References

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