Abstract
To improve the impact strength of polycarbonate (PC) and reduce hardening of PC after sub Tg annealing at 140°C a thermoplastic elastomer, poly(butylene terephthalate-co-tetramethylene glycol) (PBT-PTMG) was melt mixed with PC. A transesterification inhibitor was added to inhibit reaction between PC and PBT segments during mixing and annealing. Partial miscibility between PC and PBT segments observed for as-molded blends prevents the PBT-PTMG added from fully crystallizing upon cooling, thus acting as an impact modifier of PC. However, the phase separation proceeds as the blends are annealed at 140°C, which is below Tg of PC. This causes increase in the crystallinity of PBT segments, which acts as physical crosslinks, and thus enhances the toughness of PC physically aged.
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Ahn, C., Jo, W. & Lee, M. Effects of Sub Tg Annealing on the Mechanical Properties of Polycarbonate/Poly(ether ester) Copolymer Blends. Polym J 32, 471–475 (2000). https://doi.org/10.1295/polymj.32.471
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DOI: https://doi.org/10.1295/polymj.32.471