Transesterification kinetics in the reactive blends of liquid crystalline copolyesters and poly(ethylene terephthalate) |
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Authors: | Chongfu ZhouJinghong Ma Lihua PanBorun Liang |
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Institution: | College of Material Science and Engineering, Donghua University, Shanghai 200051, China |
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Abstract: | The transesterification kinetics of poly(ethylene terephthalate) (PET)/copoly(oxybenzoate-p-terephthalate) (liquid crystalline polymer, LCP) (70/30 by weight) in the presence of small amount of bis(2-oxazoline) (BOZ) as chain extender was studied by using 1H nuclear magnetic resonance. The kinetic data was treated as a second-order reversible reaction, and it was found that the rate constants of transesterification at 270, 280 and 290 °C were 1.55×10−2, 2.20×10−2 and 3.01×10−2 min−1, respectively, the value of which was higher than the blend without addition of BOZ, 1.26×10−2 min−1, and the activation energy of PET/LCP transesterification was 84.4 kJ mol−1. |
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Keywords: | Poly(ethylene terephthalate) Liquid crystalline polymer Transesterification kinetics Bis(2-oxazoline) |
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