Accession Number : AD0269003

Title :   THE EFFECT OF PRESSURE ON THE CRYSTALLIZATION OF POLYETHYLENE FROM DILUTE SOLUTION,

Corporate Author : CORNELL UNIV ITHACA N Y

Personal Author(s) : Wunderlich,Bernhard

Report Date : 30 DEC 1961

Pagination or Media Count : 20

Abstract : Linear polyethylene was crystallized isothermally from 0.05% toluene solution at atmospheric pressure and up to 6000 atm hydrostatic pressure. At atmospheric pressure a high temperature form of unknown structure was found crystallizing above 90 C. Single crystal lamellae crystallized between 75 and 90 C. Dendrites were formed below 75 C. The temperature dividing the dendritic growth from single crystalline growth increases with increasing pressure. The thickness of crystals grown at approximately constant supercooling, but at elevated temperature and pressure increased only slightly. Determination of the morphology of the crystals and the thickness of single crystal platelets was done using an interference microscope. (Author)

Descriptors :   *CRYSTALLIZATION, *CRYSTALS, *ETHYLENES, *POLYMERS, *SINGLE CRYSTALS, CRYSTAL STRUCTURE, GROWTH(PHYSIOLOGY), HIGH PRESSURE, HIGH TEMPERATURE, LABORATORY EQUIPMENT, MEASUREMENT, MICROSCOPY, PRESSURE, SOLUTIONS(MIXTURES), THEORY, THICKNESS, TOLUENES

Distribution Statement : APPROVED FOR PUBLIC RELEASE