Accession Number : AD0719916

Title :   Thermal Stability of Hydrocarbon Networks by Chemical Stress Relaxation.

Descriptive Note : Technical rept.,

Corporate Author : PRINCETON UNIV N J FRICK CHEMICAL LAB

Personal Author(s) : Shaw,Montgomery T. ; Tobolsky,Arthur V.

Report Date : FEB 1971

Pagination or Media Count : 18

Abstract : The thermal stability of hydrocarbon networks by chemical stress relaxation was investigated in vacuum and in the temperature ragne 300C - 350C. The polymers studied were low density polyethylene, high density polyethylene and ethylene-propylene terpolymer. Carbon-carbon crosslinked networks were produced either by dicumyl peroxide or by radiation. The results show that the overall thermal stability is in the order: peroxide cured EPT > peroxide cured LDPE > peroxide cured HDPE > radiation cured HDPE. The results are in apparent contradiction to the belief that linear structures are more stable than branched structures. We believe that this can be explained in terms of weak linkages introduced during curing. Scission probably occurs at weak linkages, at crosslinkages, and along the main chain. (Author)

Descriptors :   (*POLYMERS, THERMAL STABILITY), (*POLYETHYLENE PLASTICS, THERMAL STABILITY), CROSSLINKING(CHEMISTRY), CURING AGENTS, PEROXIDES, RADIATION CHEMISTRY

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE