OPTICAL ANISOTROPY OF THE STATISTICAL SEGMENT IN BLOCK COPOLYMERS.

This paper reports on the determination of the stress optical coefficient and the optical anisotropy of polarizability of the statistical segment in crosslinked block copolymers of bisphenol-A polycarbonate and polydimethylsiloxane at elevated temperatures in the swollen state. Small angle x-ray studies indicate that the domains are not pure polycarbonate and they are not dissociated by heating to elevated temperatures. Dielectric and optical studies indicate that the degree of association is dependent on the molecular structure and composition of the samples. Proton magnetic resonance studies on swollen samples indicate the presence of mobile polycarbonate blocks in the matrix.