Accession Number : ADA292276

Title :   Ferroelectric Polarization Mechanism of the Odd-Numbered Nylons.

Descriptive Note : Technical rept. 1 Jun 93-31 May 94,

Corporate Author : RUTGERS - THE STATE UNIV PISCATAWAY NJ

Personal Author(s) : Mei, B. Z. ; Scheinbeim, J. I. ; Newman, B. A.

PDF Url : ADA292276

Report Date : AUG 1994

Pagination or Media Count : 26

Abstract : Following studies of the ferroelectric behavior of the odd-numbered nylons, the ferroelectric switching mechanisms have been investigated in terms of the crystal orientation or reorientation using wide angle X-ray diffraction method. It has been found that the degree of double crystallite orientation resulting from uniaxial stretching below T(sub g) for the odd-numbered nylon films decreases with increasing amide content. The electric field poling results in a reorientation of unit cells without changing the crystal structure or chain packing in the nylon films. Moisture absorbed by the nylon samples can strongly affect the resultant reorientation of the crystal unit cell. With the presence of some level of moisture, a 90 deg reorientation of the unit cells is observed for all the nylons studied. A 72 deg unit cell reorientation is observed for nylon 11 samples when poled using a dry-air purge. This difference may be attributed to the increase in electric field applied to the crystalline phase when moisture is present in the amorphous region during poling. jg

Descriptors :   *POLARIZATION, *NYLON, *FERROELECTRIC MATERIALS, CRYSTAL STRUCTURE, CELLS, X RAY DIFFRACTION, FILMS, ELECTRIC FIELDS, AMORPHOUS MATERIALS, CRYSTALS, CHAINS, SAMPLING, PACKAGING, AMIDES, MOISTURE, SWITCHING, AXIAL LOADS, FERROELECTRICITY.

Subject Categories : Plastics
      Laminates and Composite Materials
      Crystallography
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE