Abstract
The effects of addition of 4,4′-dihydroxy-3,3',5,5′-tetramethyldiphenyl ether (TM-BPL) on the isothermal crystallization kinetics, mechanical properties, and morphologies for the blends of poly(butylene terephthalate) (PBT) with a liquid crystalline copolymer based on p-hydroxybenzoate and ethylene terephthalate, known as Novaccurate E310 (E310), were studied. The flexural strength and modulus of the PBT/E310 blend increased approximately in accordance with the upper-bound composite equation. When TM-BPL (2 phr) was added to the PBT/E310 (80/20) blend as a reactive compatibilizer, the flexural strength and modulus somewhat increased. The crystallization rate of PBT from the melt blend decreased with increasing E310 content and was further depressed by the presence of TM-BPL. The Avrami exponent (n) was evaluated to be approximately 3 in both the binaryl and the ternary blends. The slight improvement in the mechanical properties and the depression of the crystallization of PBT by the addition of TM-BPL are thought to be caused by the chemical reaction of TM-BPL with PBT and/or E310.
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