Polymer paperDynamic mechanical properties of random copolyesters of 4-hydroxybenzoic acid and 2-hydroxy 6-naphthoic acid☆

Add time:09/10/2019    Source:sciencedirect.com

The dynamic mechanical moduli have been determined in tension and torsion for oriented thermotropic liquid crystalline polymers formed by copolymerization of 4-hydroxybenzoic acid and 2-hydroxy 6-naphthoic acid. The behaviour has been interpreted in terms of an aggregate model of units of structure. On this basis the fall in tensile modulus with increasing temperature can be quantitatively related to two factors, a decrease in the intrinsic chain modulus and a reduction in the shear modulus.

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