Pivalolactone, 3. Reactive blending of polypivalolactone with polycarbonate

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Tijsma, Edze Jan and Does van der, Leen and Bantjes, Adriaan and Vulic, Ivan and Werumeus Buning, Gerard Hidde (1994) Pivalolactone, 3. Reactive blending of polypivalolactone with polycarbonate. Macromolecular Chemistry and Physics, 195 (5). pp. 1577-1592. ISSN 1022-1352

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Abstract:The occurrence of interchange reactions during heating of polypivalolactone (PPVL) with three polymers and their influence on the blend properties were studied. Physical blends of PPVL and bisphenol-A polycarbonate (PC) were found to be immiscible. By heating of PPVL/PC blends in the melt at 280°C, in diphenyl ether at 260°C and in a twin-screw extruder (TSE) at 280°C partial formation of copolymers was observed, provided that tetrabutyl orthotitanate (TnBT) was added. After heating of equimolar PPVL/PC blends in a TSE for 15 min, a PPVL-PC block copolymer could be isolated containing 25 mol-% pivalolactone (PVL) units. The results from thermal analyses indicated that PPVL/PC blends had become more miscible, due to the presence of copolymers formed by interchange reactions. After heating of equimolar mixtures of PPVL and a polyarylate (PAr) in a TSE for 15 min, PPVL-PAr copolymers with 5 mol-% PVL units could be isolated. Probably due to this low degree of interchange, no effect on the miscibility of the initially immiscible PPVL/PAr blends could be observed. PPVL/poly(butylene terephthalate) (PBT) blends, obtained after heating in a TSE, decomposed at a temperature between the melting temperatures of PPVL and PBT, indicating that interchange reactions may have occurred.
Item Type:Article
Copyright:© 1994 Wiley InterScience
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Link to this item:http://purl.utwente.nl/publications/71109
Official URL:http://dx.doi.org/10.1002/macp.1994.021950510
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