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Nanocomposites of Liquid Crystalline Polyhedral Oligomeric Silsesquioxane Particles and Liquid Crystalline Polymers

Published online by Cambridge University Press:  01 February 2011

Alline P. Somlai ,
Subramanian Iyer  and
David A. Schiraldi
Alline P. Somlai
Affiliation:
Department of Macromolecular Science and Engineering, Case Western Reserve University Cleveland, Ohio, 44106–7202, USA
Subramanian Iyer
Affiliation:
Department of Macromolecular Science and Engineering, Case Western Reserve University Cleveland, Ohio, 44106–7202, USA
David A. Schiraldi
Affiliation:
Department of Macromolecular Science and Engineering, Case Western Reserve University Cleveland, Ohio, 44106–7202, USA
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Abstract

A new liquid crystalline nanoparticle has been synthesized by the reaction of a cyanobiphenyl derivative with polyhedral oligomeric silsesquioxane (POSS®*). Two POSS nanoparticles, liquid crystalline POSS (LC POSS 3) and a non-LC isooctyl POSS (OPOSS), were then compounded at 2.5 wt % into thermotropic polyester liquid crystalline polymers (LCPs) poly(hexamethylene 4,4'-bibenzoate), poly(diethylene glycol 4,4'-bibenzoate) as well as a frustrated LCP 45:55 poly(ethylene terephthalate-co-4,4'-bibenzoate). These polymers are currently being studied for potential use in high performance fibers and high barrier packaging materials. A comprehensive study of LCP/LC POSS 3 nanocomposites will focus on any changes in the thermal and mechanical properties of the LCPs with increasing LC POSS 3 concentration. It will be determined how incorporation of LC POSS 3 affects the liquid crystalline phases of an amorphous and crystalline LCP. Of special interest is the incorporation of LC POSS 3 into a frustrated LCP. It is proposed that the LC POSS 3 might help to unfrustrate the LCP.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 788: Symposium L – Continuous Nanophase and Nanostructured Materials , 2003 , L9.10
Copyright
Copyright © Materials Research Society 2004

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