Accession Number : AD0617640

Title :   THE EFFECT OF CRYSTALLIZATION CONDITIONS AND TEMPERATURE ON THE POLYMORPHIC FORMS OF POLYETHYLENE,

Corporate Author : FLORIDA STATE UNIV TALLAHASSEE

Personal Author(s) : Fatou,J. G. ; Baker,C. H. ; Mandelkern,L.

Report Date : SEP 1964

Pagination or Media Count : 7

Abstract : Experimental evidence (using wide-angle X-ray and dilatometric techniques) is presented to indicate development of a second crystalline form as a result of further crystallization from the melt, and the temperature interval covering its formation and disappearance. Three fractionated samples of polyethylene of viscosity average molecular weights 12 500, 425 000 and 1 000 000 and an unfractionated sample of Marlex 50 of molecular weight 180 000 were used. The extra reflections reported were not observed with rapidly cooled samples. (Author)

Descriptors :   (*POLYETHYLENE PLASTICS, CRYSTALLOGRAPHY), CRYSTAL STRUCTURE, X RAY DIFFRACTION, CRYSTALLIZATION, TEMPERATURE, HEAT TREATMENT, POL

Distribution Statement : APPROVED FOR PUBLIC RELEASE