Blends of polycarbonate and polysulphone–polydimethyl–siloxane block copolymers: analysis of compatibility and impact strength

✍ Scribed by S. S. Pesetskii; B. Jurkowski; I. P. Storozcuk; V. N. Koval

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 347 KB
• Volume: 73
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19990906)73:10<1823::aid-app1>3.0.co;2-7

✦ Synopsis

The possibility of modifying polycarbonates by using dian (Bisphenol A) polysulphone-polydimethyl siloxane block copolymers having multiblock structure and triblocks with end polydimethyl siloxane or a polysulphone block structure was shown. In triblock copolymers the polydimethyl siloxane blocks have a constant molecular weight equal to 2500, while in polyblocks it was assumed to be 2500 and 10,000. The molecular weight of polysulphone blocks varied between 700 and 9000 in triblocks or between 500 and 4500 in polyblocks. It was found that block copolymers of both multiand triblock structure with polydimethyl siloxane end blocks of concentration 45-68 wt % are created with PC microheterogenous blends. These blends, in a wide temperature interval (from cryogenic to the glass transition temperature of PC), have high impact strength when multiple crazes are created independently on testing temperature.