Accession Number : AD0807823

Title :   MELTING OF POLYMERS,

Descriptive Note : Technical rept.,

Corporate Author : RENSSELAER POLYTECHNIC INST TROY NY DEPT OF CHEMISTRY

Personal Author(s) : Wunderlich, Bernhard

Report Date : 30 JAN 1967

Pagination or Media Count : 17

Abstract : This report presents a general discussion of polymer melting. Equilibrium crystals of polymers in the form of extended chain crystals are found to follow equilibrium thermodynamics only when heated slowly. On faster experimentation superheating results. Most polymer crystals are metastable folded chain crystals which reorganize badly on heating. Time dependent melting studies are necessary to evaluate the different polymer crystal morphologies. A more detailed discussion of polyethylene, polyoxymethylene, polytetrafluoroethylene, and polycaprolactam is given. Melting point variations are shown to cover as much as 200 C. (Author)

Descriptors :   (*POLYMERS, MELTING POINT), THERMODYNAMICS, MELTING, POLYETHYLENE PLASTICS, SINGLE CRYSTALS, FLUORINE COMPOUNDS, ENTROPY, RECRYSTALLIZATION, OXIDES, STYRENE PLASTICS, ACETAL RESINS, NYLON, CRYSTAL STRUCTURE.

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE