Abstract
A polystyrene-grafted polypropylene sample was prepared by solid-state grafting polymerization in the presence of 2,2,6,6-tetramethyl-piperidinyloxy. Temperature rising elution fractionation of the grafted PP was performed and the fractions were characterized by 1H- and 13C-NMR, FT-IR, GPC, DSC, and WAXD. Results show that the grafted PP fraction eluted at 114°C accounts for 42% of the graft copolymer and has the highest grafting degree, high melting temperature and crystallinity, and high molecular weight. All the phenomena suggest that the grafted polymer contains a major component that has low branch density and long branch chain and a minor component with high branch density and short branches.
Support by the National Natural Science Foundation of China (grant no. 20474053) and Major State Basic Research Programs (grant no. 2005CB623804) is gratefully acknowledged.
Notes
a Melting temperature.
b Degree of crystallization.
c Enthalpy of melting.
d Crystallization peak temperature.