Bisphenol-A polycarbonate/polydimethylsiloxane multiblock copolymers. II. Effects of siloxane oligomer structure on the properties of copolymers

✍ Scribed by Chen-Chi M. Ma; Jen-Tau Gu; Wen-Chen Fang; Jen-Chang Yang; Li-Dar Tsai

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 344 KB
• Volume: 66
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19971003)66:1<67::aid-app8>3.0.co;2-m

✦ Synopsis

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.