Accession Number:

ADA218331

Title:

Ultrastructure Processing of Ordered Polymers

Descriptive Note:

Final rept. 1 Aug 1987-31 May 1989

Corporate Author:

JOHNS HOPKINS UNIV BALTIMORE MD

Personal Author(s):

Report Date:

1990-01-18

Pagination or Media Count:

158.0

Abstract:

In order to explore the nonlinear elasticity of high-performance PBZT fibers, a method using laser-generated ultrasound has been developed to measure the Youngs modulus of the fibers as a function of temperature and static tensile stress. X-ray diffraction has also been used to measure both the crystal modulus and aspects of the ultra-structure such as crystal size, unit cell structure and orientation. It is shown that improved crystal orientation with increased tensile stress is one of the most important mechanisms of the nonlinear elasticity. Nonlinear elasticity, Temperature, PBT, Strong fibers, Modulus, Laser-generated ultrasound, X-ray, Relaxation, Orientation, Stress, Crystal modulus, Unit cell, Uniform stress, Uniform strain, Processing, Crystal size.

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE