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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis of high molecular weight aromatic polyesters via integrated alternating ring-opening copolymerization and chain extension methods
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Synthesis of high molecular weight aromatic polyesters via integrated alternating ring-opening copolymerization and chain extension methods

机译：通过集成交流开环共聚和链延伸方法合成高分子量芳族聚酯

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摘要

Due to their good mechanical properties, high molecular weight polyesters (PEs) are highly desirable for a wide range of applications especially in the packaging industry. However, the synthesis of high molecular weight polymers by energy efficient methods is difficult. In this study, a series of semi-aromatic PEs were synthesized via the alternating ring-opening copolymerization (ROCOP) of phthalic anhydride (PA) and cyclohexene oxide (CHO) using a salen chromium(III) complex as a catalyst and 4-(dimethylamino)pyridine as a cocatalyst. By varying the molar ratios between CHO and PA, PEs of different molecular weights were obtained. Hexamethylene diisocyanate was used as a chain extender that further increased the molecular weights of these PEs. These chain extended aromatic polyesters (PE-Xs) showed significant improvement in the glass transition temperature (T-g) values. Thus, integration of ROCOP with the chain extension method can be used as an effective strategy to prepare high molecular weight PEs with improved thermal stabilities and enhanced mechanical properties. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47200.
机译：由于其良好的机械性能，高分子量聚酯（PE）非常希望，特别是在包装行业中的各种应用。然而，难以通过节能方法合成高分子量聚合物。在该研究中，通过使用Salen铬（III）复合物作为催化剂和4-（4-（）通过邻苯二甲酸酐（PA）和环己烯（CHO）的交替的开环共聚（Rocop）合成一系列半芳族PE。二甲基氨基）吡啶作为助催化剂。通过改变CHO和PA之间的摩尔比，获得不同分子量的PE。六亚甲基二异氰酸酯用作链延长器，进一步增加了这些PE的分子量。这些链扩展芳族聚酯（PE-XS）显示出玻璃化转变温度（T-G）值的显着改善。因此，通过链延伸方法的抗烃的整合可用作制备具有改善的热稳定性和增强的机械性能的高分子量PE的有效策略。 （c）2018 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47200。

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