Molecular engineering Liquid crystalline polymers

Zhou and Lenz (1983) and Zhou et al. (1985) discussed the substitution effect from the point of view of steric and polar effects. However, from above discussions one sees a more intricate picture. A full understanding of the effect demands further study. Nevertheless, substitution is so effective that a lot of studies have used this concept in the molecular engineering of liquid crystalline polymers in order to have desired phase properties. 

Specific blends, which could offer an interesting combination of properties with proper com-patibilization, include PPS/PSE, PEl/PPS, PA/PSE, PA/PEI, and PC/PPS. Patent activity has been noted for most of these blend combinations as well as other selected blends involving engineering polymers as noted in Table 17.3. A number of recent patent and published papers have discussed blends of engineering polymers with various specialty polymers including high temperature polymers, liquid crystalline polymers (LCP s), conductive polymers, and as matrix materials for molecular composites. These will be discussed in the following sections. 

Molecular Engineering of Side Chain Liquid Crystalline Polymers by Living Polymerizations ... 

This article is reprinted with permission from C. Pugh, A. Kiste, Progress in Polymer Science, Vol. 22 Molecular Engineering of Side-Chain Liquid Crystalline Polymers by Living Polymerization, (1997), Elsevier Science Ltd., Oxford, England. 

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