Accession Number:

ADA171221

Title:

Mechanical Properties Versus Morphology of Ordered Polymers. Volume 6

Descriptive Note:

Final rept. for 1 Sep 1983-31 Aug 1984

Corporate Author:

MASSACHUSETTS UNIV AMHERST DEPT OF POLYMER SCIENCE AND ENGINEERING

Report Date:

1986-06-01

Pagination or Media Count:

132.0

Abstract:

This project seeks to determine for rigid rod polymer fibers and films of polyp-phenylene benzobisthiazole the relationships between mechanical properties and sample microstructures and to use this knowledge to obtain the maximum in strength and modulus for these materials. Structural studies involved primarily optical microscopy, electron microscopy both scanning and transmission and wide angle x-ray scattering. Spectroscopic studies employed Fourier transform infrared spectroscopy. Mechanical behavior was measured in uniaxial tension over a range of strain rates and temperatures. A special force- temperature apparatus permitted assessment of the thermal expansion coefficient of PBT. The microstructural studies concentrated on the structure developed during the fast coagulation stage of the spinning process, as well as the structure obtained by slow coagulation of a quiescent isotropic polymer solution. Growth of crystal solvates in the PBTMSA system was observed for the first time through the slow diffusion of water into the quiescent isotropic solution. Phase behavior was investigated and a pseudo-binary schematic phase diagram for the PBTMSA.H2O system was developed. The force versus temperature behavior at constant length of PBT and Kevlar fibers was also investigated.

Subject Categories:

  • Plastics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE