Accession Number:

ADA158570

Title:

Experimental Measurement Technique for Organic Polymer Films and Crystals

Descriptive Note:

Rept. for 1 Oct 76-30 Sep 77

Corporate Author:

PENNSYLVANIA UNIV PHILADELPHIA DEPT OFPHYSICS

Personal Author(s):

Report Date:

1977-09-30

Pagination or Media Count:

17.0

Abstract:

The primary goal of our present research activity is to systematically design and study high strength crystalline polymers as thin films and single crystals that exhibit high pyroelectric, ad nonlinear optical propert ies. In recent years, piezoelectric and pyroelectric response has been shown to exist in some amorphous synthetic organic polymers. On the basis of developments in this field, we have focused on two features that are important i the amorphous structure, and ii the actual molecular charge dipole present in these organic polymers. These two features are responsible for limiting the piezo- and pyroactivity to relatively small values i presently available polymers. By going to crystalline polymers and increasing the magnitude of the charged dipole, we believe the optimum response is achievable in organic polymers. Detailed design features and synthetic procedures for new single crystal polymers being developed for these studies will be reported elsewhere. In this interim report, we briefly describe a convenient experimental apparatus for measuring the low frequency dielectric constants and pyroelectric coefficients of these polymeric solids. The measurement technique can be computer controlled and allows on-line data reduction. First, we summarize the measurement methods adapted for use with polymer samples and then provide a detailed description of the experimental apparatus which has been tested using ferroelectric crystals such as barium titanate BaTi03.

Subject Categories:

  • Crystallography
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE