Mechanical Behavior of Side-Chain Liquid Crystalline Networks

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Abstract
The mechanical properties of a homologue series of side-chain mesomorphic net- M.orks were studied with a piezo-rheometer over frequencies ranging from 10~~ Hz to 10~ Hz. The results show that the compound's response is governed essentially by the dynamic glass transition. It is sensitive to the N-SmA transition, but insensitive to the N-I transition, ivith the result that the empirical principle of time-temperature superposition can be applied through- out the N-I transition. The influence of the crosslinking density and the amount of mesogenic side groups ~vas also studied. For each of the samples, the static rigidity modulus Go, the infinite-frequency dynamic rigidity modulus Gco, and the characteristic frequencies respectively associated ~vith the longest visco-elastic mode and with the glass transition, were determined.

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