Poly(organophosphazenes) with azoxybenzene side groups. Synthesis and morphology

Abstract

Azoxybenzene derivatives with chiral alkoxy terminal units were introduced as side chains in poly(organophosphazenes). From the DSC studies, suppression of side-chain crystallization by the azoxy group was evident. The thermal behavior was dependent on the spacer length and on the structure of the terminal units on the azoxybenzene group. 2-butoxy and 2-methyl-1-butoxy terminal groups imposed a layered morphology on the polymers. Spontaneous polarization for the aligned polyphosphazenes was measured by integration of the pyroelectric coefficient with respect to temperature