The high molecular weight poly (1,5-pentene terephthalate) synthesis and its molecular weight distribution control are still challenging, and one of the critical problems is the lack of efficient catalysts. Based on the coordination activation mechanism, a heavy metal free, hydrolysis-resistant and 1,5-Pentanediol soluble Ti/Zn bimetallic catalyst has been synthesized and characterized. The Ti/Zn bimetallic active center increases electron-absorption effect in catalyst to promote the esterification process, and the diol-metal alkoxide structure increases the production of oligomer ligands, which can effectively improve transesterification efficiency. The optimal polycondensation reaction temperature for PPeT synthesized with Ti/Zn bimetallic catalyst can be reduced to 230 °C, with an average reaction rate of 90.33 g mol·min. The number average molecular weight of PPeT can be increased to 3.02 × 10 g mol, and the polymer dispersive index can be as low as 1.90. As the number average molecular weight increases, poly (1,5-pentene terephthalate) has a tensile strength of 29.80 MPa and an elongation at break of 16.39%. More importantly, Ti/Zn bimetallic catalyst retains excellent catalytic activity after treatment with boiling water and has significantly improved hydrolysis resistance and storage stability. Ti/Zn bimetallic catalyst can significantly increase the molecular weight and melt viscosity of poly (1,5-pentene terephthalate), giving it the potential for a wider range of applications in plastics and fiber fields.

中文翻译：

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基于配位活化机理设计抗水解Ti/Zn双金属催化剂合成高分子量聚对苯二甲酸1,5-戊烯(PPeT)

高分子量聚对苯二甲酸1,5-戊烯酯的合成及其分子量分布控制仍然具有挑战性，其中关键问题之一是缺乏高效的催化剂。基于配位活化机理，合成并表征了一种无重金属、耐水解、1,5-戊二醇可溶的Ti/Zn双金属催化剂。 Ti/Zn双金属活性中心增加了催化剂中的电子吸收效应，促进酯化过程，二醇-金属醇盐结构增加了低聚物配体的产生，可有效提高酯交换效率。 Ti/Zn双金属催化剂合成PPeT的最佳缩聚反应温度可降低至230℃，平均反应速率为90.33 g mol·min。 PPeT的数均分子量可提高至3.02×10 g mol，聚合物分散指数可低至1.90。随着数均分子量的增加，聚对苯二甲酸1,5-戊烯酯的拉伸强度为29.80MPa，断裂伸长率为16.39%。更重要的是，Ti/Zn双金属催化剂经沸水处理后仍保持优异的催化活性，并显着提高了耐水解性和储存稳定性。 Ti/Zn双金属催化剂可以显着提高聚对苯二甲酸1,5-戊烯的分子量和熔体粘度，使其在塑料和纤维领域具有更广泛的应用潜力。