Copolymers of n -hexyl and allyl isocyanates were successfully synthesized using an organotitanium(IV) catalyst initiated polymerization. Viscosity measurements indicated that molecular weight increased with decrease in monomer/initiator ratio. Monomer reactivity ratios were calculated using the copolymer composition equation, and the resulting values indicated relative randomness in the copolymer. The liquid-crystalline behavior of these copolymers was studied with regard to their molecular weight, composition, and concentration. Radical cross-linking was extensively studied but yielded only very brittle gels. Consequently, hydrosilation cross-linking was investigated and did yield networks suitable for orientation in a novel technique for increasing the mechanical properties of polymer films. All the hydrosilation cross-linked gels exhibited brilliant mesomorphic birefringence under a cross-polarized microscope at low cross-link density. In addition, the glass transition temperatures of the hydrosilation cross-linked networks were found to be lower than those of their constituent polymers.
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Zhao et al. (1996) studied this question.
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