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Poly(butylene terephthalate)–polyarylate blends
Authors:J Runt  D M Miley  K P Gallagher  X Zhang  C A Barron  S K Kumar
Abstract:In this paper we focus on miscible blends of two engineering polymers: poly(butylene terephthalate) (PBT) and a polyarylate (PAr). The issue of transesterification in these blends will be addressed, followed by a discussion of the crystallization kinetics of PBT, poly(ethylene terephthalate) and several PBT/PAr blends. The ability to estimate polymer–polymer interaction parameters in blends from melting point depression will also be discussed. The amorphous phase behavior of the PBT/PAr blends has been explored primarily using dielectric spectroscopy. For blends in which PBT has crystallized, we observe two relaxations associated with Tg-like motion, and this behavior is interpreted in light of our recent work on order–disorder interphases in crystalline blends.
Keywords:Polymer blends  Crystallization  Relaxation behavior
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