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Kinetics of polycondensation and copolycondensation of bis(3-hydroxypropyl terephthalate) and bis(2-hydroxyethyl terephthalate)

机译:双(3-羟丙基对苯二甲酸酯)和双(2-羟乙基对苯二甲酸酯)的缩聚和共缩聚动力学

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The kinetics of polycondensation and copolycondensation reactions of bis(3-hydroxypropyl) terephthalate (BHPT) and bis(2-hydroxyethyl) terephthalate (BHET) as monomers were investigated at 270 degrees C, in the presence of titanium tetrabutoxide (TBT) as a catalyst. BHPT was prepared by ester interchange reaction of dimethyl terephthalate (DMT) and 1,3-propanediol (PD). Applying second-order kinetics for polycondensation, the rate constants of polycondensation of BHPT and BHET, k(11) and k(22), were calculated as 3.975 and 2.055 min(-1), respectively. The rate constants of cross-reactions in the copolycondensation of BHPT and BHET, k(12) and k(21), were obtained by using the results obtained from a proton nuclear magnetic resonance spectroscopy. The rate constants during the copolycondensation of BHPT and BHET at 270 degrees C decreased in the order k(11) > k(12) > k(22) > k(21), indicating the block nature of the copolycondensation. (C) 2000 John Wiley & Sons, Inc. [References: 26]
机译:在四丁氧基钛(TBT)催化剂存在下,在270℃下研究了对苯二甲酸双(3-羟丙基)对苯二甲酸酯(BHPT)和对苯二甲酸双(2-羟乙基)对苯二甲酸酯(BHET)的缩聚和共缩聚反应动力学。 。 BHPT是通过对苯二甲酸二甲酯(DMT)和1,3-丙二醇(PD)的酯交换反应制备的。应用二阶动力学进行缩聚,BHPT和BHET的缩聚速率常数k(11)和k(22)分别计算为3.975和2.055 min(-1)。 BHPT和BHET的共缩聚反应中的交叉反应速率常数k(12)和k(21)是通过使用质子核磁共振波谱获得的结果得出的。在270摄氏度下BHPT和BHET共缩聚过程中的速率常数按k(11)> k(12)> k(22)> k(21)的顺序降低,表明该共缩聚的嵌段性质。 (C)2000 John Wiley&Sons,Inc. [参考:26]

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