Accession Number:

AD0252571

Title:

A LIGHT SCATTERING STUDY OF THE ANNEALING OF DRAWN POLYETHYLENE

Descriptive Note:

Technical rept.

Corporate Author:

MASSACHUSETTS UNIV AMHERST

Personal Author(s):

Report Date:

1961-02-13

Pagination or Media Count:

11.0

Abstract:

Low-angle light scattering patterns are obtained for stretched polyethylene films which are annealed both with and without the constraint of constant length. The effects of stretching temperature, annealing temperature, temperature of measurement and degree of elongation are studied. Changes in morphology of structures having sizes up to several microns occur upon annealing, as revealed by the low-angle photographic light scattering technique. These parallel previously observed changes in the orientation of the individual crystals. Thus, it appears that the explanation of these orientational changes must also be compatible with the accompanying change in the texture of the superstructure. The scattering patterns for heat shrunk samples prove the coexistence of two phases one having fibrillar symmetry and the other spherical symmetry. The scale of mixing of these two phases has not yet been established. The results are consistent with an annealing mechanism which involves melting of deformed fibrillar crystals and recrystallization in a spherically symmetrical phase. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE