Accession Number:

ADA273413

Title:

Ultrastructure Processing of Macromolecular Materials

Descriptive Note:

Final rept. 12 Feb 1990-11 Feb 1993

Corporate Author:

MASSACHUSETTS UNIV AMHERST DEPT OF POLYMER SCIENCE AND ENGINEERING

Personal Author(s):

Report Date:

1993-06-25

Pagination or Media Count:

25.0

Abstract:

The effect of microstructure on miscibility of polymer blends has been investigated in a number of model systems by thermal, mechanical and novel spectroscopic techniques. An understanding of the fundamental basis of the metastable miscibility found in large number of high temperature systems, i.e. these typically involving polyimides or related materials with high Tgs has also been gained. In a complementary investigation we have performed computer simulation studies of the equilibrium behavior of various blends, and under several types of constraint, to provide insights into behavior in binary systems at the segmental level. This study also investigated dynamic aspects, including phase separation. In another investigation, we have studied electro-optically active conjugated polymers, principally polyp-phenylene vinylene and its derivatives, modifications and blends. The emphasis has been on gaining a detailed understanding of the structural properties and concurrently exploiting the several electro-optical effects for which these polymer systems are noted. These include non-linear optical phenomena and electroluminescence. Certain solution properties of polymer systems have also been studied. We have continued to use quasi-elastic light-scattering measurements to investigate translational diffusion of solvated polymers in porous media and other properties of polar and non-polar macromolecules. A synthetic effort in side-chain liquid crystal polymers has led to the systematic study of the thermal, mechanical and dielectric properties of several representation series and of their mixtures.

Subject Categories:

  • Polymer Chemistry
  • Crystallography
  • Electricity and Magnetism
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE