A grafting study on partially dehydrochlorinated poly(vinyl chloride) by atom transfer radical polymerization

Abstract

HCl elimination in low ratio was first carried out from poly(vinyl chloride) to increase allylic chlorines. Partially dehydrochlorinated poly(vinyl chloride), having a macroinitiator effect, was grafted with tert-butyl methacrylate via atom transfer radical polymerization in the presence of CuBr/2',2'-bipyridine at 64 degrees C in tetrahydrofuran. Original poly(vinyl chloride) was also grafted with tert-butyl methacrylate under the same conditions to compare with that of partially dehydrochlorinated poly(vinyl chloride). The graft copolymers were characterized by elemental analysis, FTIR, H-1 and C-13-NMR, differential scanning calorimetry, and gel permeation chromatography (GPC). Thermal stabilities of the graft copolymers were investigated by thermogravimetric analysis as compared with those of the macroinitiators.