Abstract
The effect of the mesomorphic (cholesteric) state on the chemical reactivity was investigated by the copolymerization reactions of p-ethoxy-p′-acryloyloxyazobenzene (EOA) and cholesteryl acrylate (CA). The monomers form partially miscible solid solutions on the EOA side. The eutectics having minimum clearing point values are cholesteric solution at a CA content of 0.3 M. Polymerization rates in the cholesteric state are generally lower than those in the isotropic liquid at a given temperature. Relative reactivity ratios of the copolymerization are as follows: rCA,1=0.28, rCA,m=0.16, rEOA,1=0.57, and rEOA,m=1.10. Products of the corresponding constants refer to statistical copolymerization. Differences in monomer polarizability are high (Δe=1.32) as calculated from the r values. In the mesomorphic state, the probability of incorporation of CA into the chain is less, compared to the isotropic state.
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Nyitrai, K., Cser, F. & Hardy, G. Study of Phase-Diagram and Copolymerization of p-Ethoxy-p′-acryloyloxy-azobeiizene with Cholesteryl Acrylate. Polym J 13, 1085–1092 (1981). https://doi.org/10.1295/polymj.13.1085
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DOI: https://doi.org/10.1295/polymj.13.1085
