Aminopropyl-terminated polydimethylsiloxane (PDMS)-bisphenol-A polycarbonate block copolymers were synthesized by interfacial phosgenation reaction of 2,2-bis(4-hydroxyphenyl) propane (BPA) and aminopropyl-terminated PDMS. A new synthetic procedure shows better conversion yield of PDMS oligomer. IR, Si nuclear magnetic resonance spectra were used to identify the exact chemical structures of the PDMS-PC block copolymers. The conversions of PDMS of these copolymers were Ç 90% and independent of the PDMS content. The intrinsic viscosities, IV, [ h] studied were in the range between 0.23 and 2.25 dL/g in dichloromethane at 25ЊC with different reaction conditions. The intrinsic viscosity and the glass transition temperature decreased with increasing PDMS content at the same reaction temperature, while the melting flow indices increase with increasing PDMS content. Transparent and colorless films, which showed good oxygen-to-nitrogen permselectivity, could be cast from dichloromethane.

Polycarbonate-polydimethylsiloxane (PDMS) copolymers were synthesized by interfacial phosgenation of 2,2-bis(4-hydroxyphenyl)propane (bisphenol-A) with different types of PDMS oligomers including a,v-amino-organofunctional polydimethylsiloxane (AT-PDMS oligomer), a,v-hydroxy-organofunctional polydimethylsiloxane (HT-PDMS oligomer), and a,v-phenol-organofunctional polydimethylsiloxane (PT-PDMS oligomer).

Polycarbonate-polydimethylsiloxane (PDMS) copolymers were synthesized by interfacial phosgenation of 2,2-bis(4-hydroxyphenyl)propane (bisphenol-A) with different types of PDMS oligomers including a,v-amino-organofunctional polydimethylsiloxane (AT-PDMS oligomer), a,v-hydroxy-organofunctional polydimethylsiloxane (HT-PDMS oligomer), and a,v-phenol-organofunctional polydimethylsiloxane (PT-PDMS oligomer). 1 H-NMR spectra indicated the conversion of AT-PDMS-PC copolymer was in the range between 85 and 95%, HT-PDMS-PC was 45-55%, and PT-PDMS-PC was 70-80%. It was found that the intrinsic viscosity of PDMS-PC copolymers decreased with increasing PT-PDMS oligomer content. The intrinsic viscosity, IV, also decreased with increasing cumylphenol content. The melt indices of PDMS-PC copolymers blended with neat PC increased with increasing PDMS-PC content and the copolymers showed good processability. Izod impact strength of PDMS-PC copolymer was improved while retaining tensile and flexural strengths of neat PC.