Accession Number : AD0759007

Title :   The Freezing of Crystalline Polymers as Evidenced by Compressibility Measurements,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Warfield,R. W.

Report Date : 23 FEB 1973

Pagination or Media Count : 24

Abstract : The freezing points for a series of semicrystalline and crystalline polymers have been determined as functions of pressure and temperature. It is shown that with increasing temperature a greater pressure must be applied to induce freezing. It was also found that many polymers exhibit a small amount of supercooling. It has been found that crystalline polymers exhibit maximum temperatures above which it is impossible to induce crystallization regardless of the applied pressure. This maximum temperature is discussed in relation to the possible existence of a critical temperature for a polymer. Combining this new information on the freezing of polymers with previously known relations, it is now possible to give a more extended relationship for the various thermal transitions in a polymer. (Author)

Descriptors :   (*POLYMERS, *FREEZING), PRESSURE, TEMPERATURE, SUPERCOOLING, NUMERICAL ANALYSIS, CRYSTALLIZATION, POLYETHYLENE PLASTICS, COMPRESSIVE PROPERTIES

Subject Categories : Physical Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE