Accession Number : AD0709797

Title :   MECHANISM OF INITIATION IN THE THERMAL POLYMERIZATION OF STYRENE. THERMAL DECOMPOSITION OF cis-3,6-DIPHENYL-3,4,5,6-TETRAHYDROPYRIDAZINE,

Corporate Author : ALBERTA UNIV EDMONTON DEPT OF CHEMISTRY

Personal Author(s) : Kopecky,Karl R. ; Evani,Syamalarao

Report Date : 12 JUN 1969

Pagination or Media Count : 9

Abstract : Thermal decomposition of cis-3,6-diphenyl-3,4,5,6-tetrahydropyridazine, 1, results in the formation of about 60% styrene, 27% cis-and 13% trans-1,2-diphenylcyclobutane. The relative product yields vary little over the temperature range 64-133C. This indicates that 1 decomposes exclusively to the 1,4-diphenyl-1,4-butadiyl diradical, 2, and nitrogen. The diradical, 2, cannot be trapped by styrene and 1 is not an initiator of styrene polymerization. Therefore, 2 is not the radical intermediate responsible for the thermal initiation of styrene polymerization. (Author)

Descriptors :   (*NITROGEN HETEROCYCLIC COMPOUNDS, *PYROLYSIS), (*STYRENES, *POLYMERIZATION), FREE RADICALS, REACTION KINETICS, CANADA

Subject Categories : Organic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE