Reactive compatibilization of polycarbonate and poly(methyl methacrylate) in the presence of a novel transesterification catalyst SnCl2· 2H2O

Abstract

We compare the effectiveness of various known organometallic transesterification catalysts with a novel SnCl2·2H 2O transesterification catalyst in the formation of homogeneous PC/PMMA blends with single Tg. It is shown that SnCl 2·2H2O works more efficiently than the other organometallic transesterification catalysts. Even 0.1% (wt/wt) of SnCl 2·2H2O is enough to establish an interaction between PC and PMMA phases, leading to the formation of a homogeneous PC/PMMA blend with single Tg and single degradation temperature. FTIR, 1H NMR, and XRD studies provide evidence of the formation of PC-g-PMMA graft copolymer, which acts as a compatibilizer between the PC and PMMA phases. A significant improvement in the optical transparency of the PC/10PMMA blend prepared using SnCl2·2H2O catalyst as compared with PC/10PMMA without any catalyst is observed. There is also a change in the morphology from granular in uncompatibilized blends to lamellar in the compatibilized blends. © 2011 American Chemical Society.