Accession Number : AD0733669

Title :   Amorphous Polyolefins: The Relations between Molecular Structure, Submolecular Motion and Mechanical Behavior.

Descriptive Note : Technical rept. Sep 69-Aug 71,

Corporate Author : PRINCETON UNIV N J DEPT OF CHEMICAL ENGINEERING

Personal Author(s) : Gillham,J. K. ; Martin,J. Ronald

Report Date : NOV 1971

Pagination or Media Count : 28

Abstract : The thermomechanical spectra of two series of amorphous polyolefins represented by ((CH2)m-C(CH3)2)n and ((CH2)m-C(CH3)(C2H5))n where m = 1, 2, and 3, are presented from -180C to a point above the glass transition temperature. The polymers were obtained by cationic polymerization of alpha-olefins. The mechanical spectra show a maximum in glass transition temperature and secondary transition temperature for the second member of each series. This maximum is interpreted in terms of a proposed intermolecular interlocking considered to be at a maximum for the second member of the series, and serving to restrict the submolecular motions associated with the transitions. The proposal is discussed in terms of its consequences upon free volume, density, cohesive energy density, and chain flexibility. (Author)

Descriptors :   (*POLYMERS, MECHANICAL PROPERTIES), THERMAL ANALYSIS, CRYSTALS, GLASS, MOLECULAR STRUCTURE, MOLECULAR ISOMERISM, TRANSITION TEMPERATURE, MOLECULAR ASSOCIATION

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE