Small Angle X-ray Scattering Studies of Poly(arylethinylene): MolecularConformation in Solution and Orientational Ordering in Rod-coil Ionomer Blends

摘要

Poly(pyridyl/phenyl-ethinylene) polymers of tuned rigidity/flexibility weresynthesized and their molecular conformation in solution determined by small angel x-ray scattering. These polymers were used as modecularly dispersed reinforcing components in ionomer blends with partially sulfonated polystyrene. Homogeneous ionomer blends were formed by acid-base interactions between the two blend components. Small angel x-ray scattering revealed that in the case of rodlike or semiflexible poly(pyridyl/phenyl-ethinylenes) an elongation induced orientational ordering is obtained. However blend samples prepared with flexible poly(pyridyl/phenyl-ethinylene) polymers do not show any observable orientation. The orientation parameter varied systematically with the rigidity/flexibility of the reinforcing component, as did the Young modulus determined from stress strain measurements.