Accession Number:

AD0735709

Title:

Structural Characterization of Isotactic Polypropylene Films of Ultrahigh Orientation. Part I. Determination of Crystalline and Amorphous Orientation.

Descriptive Note:

Technical rept.,

Corporate Author:

ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS

Personal Author(s):

Report Date:

1971-09-01

Pagination or Media Count:

19.0

Abstract:

Preferred orientation of the crystalline and amorphous regions in semicrystalline polymers have long been recognized as important factors influencing physical and mechanical behavior. Nearly perfect crystalline orientation was found in a set of four polypropylene films prepared under different stretching conditions by X-ray diffraction. This demonstrates that neither shear nor pressure is essential to the attainment of ultrahigh crystalline orientation. Sonic modulus measurements give values from 0.38 to 0.69 for the amorphous orientation function. The results indicate that certain variations in structure are possible in polymers with ultrahigh crystalline orientation.

Subject Categories:

  • Plastics
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE