The thermolysis of 60/40 mixtures of polyethylene (PE) and polystyrene
(PS) was investigated at temperatures below 440 degrees C. Liquid yie
ld from the mixture, 84.1%, was comparable to yields obtained with the
individual polymers. The yields of styrene monomer, 57.1%, and alpha-
olefins, 27.7%, increased over those obtained when the polymers were p
rocessed individually. A significant interaction was observed between
the polymers in which the addition of PS enhanced the rate of thermoly
sis of PE. It is proposed that this enhancement was due to the abstrac
tion of hydrogen from the PE fraction by polystyryl radicals. The resu
lt of this effect is to increase the rate of volatile production from
the PE and increase the solubility of the residue in chloroform. The d
ata also support a mechanism for dimer production other than the gener
ally accepted 1,3 transfer. (C) 1996 John Wiley & Sons, Inc.