Chain extenders for polyester. II. Reactivities of carboxyl-addition-type chain extenders; bis cyclic-imino-ethers
Chain extenders for polyester. II. Reactivities of carboxyl-addition-type chain extenders; bis cyclic-imino-ethers
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DOI：
10.1002/app.1986.070320534
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发表时间：
1986-10
影响因子：
3
通讯作者：
H. Inata;Shunichi Matsumura
中科院分区：
文献类型：
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作者：
H. Inata;Shunichi Matsumura
研究了2，2‘-双(2-恶唑啉)等双环亚胺醚的反应行为，评价了它们作为聚对苯二甲酸乙二酯和聚对苯二甲酸丁二醇酯扩链剂的实用性。已经观察到，大量2，2‘-双(2-恶唑啉)的过量使用导致了几乎相同分子量的聚酯。此外，当加入过量的扩链剂并固定反应条件时，无论初始相对分子质量和羧基含量(CV)如何，偶联羧基末端与初始羧基末端的比例都变得恒定。结果表明，扩链聚酯具有预定的相对分子质量和变异系数，它们只与初始聚合物的相对分子质量和变异系数有关，而与扩链剂的加入量无关。
The reaction behavior of such bis cyclic-imino-ethers as 2, 2′-bis(2-oxazoline), which had been proved in the previous paper to be an effective chain extender to couple carboxyl terminals of linear polyesters through addition reaction, has been studied to evaluate their practical applicability as the chain extenders for poly(ethylene terephthalate) and poly(butylene terephthalate). It has been observed that a wide range of excess use of 2,2′-bis(2-oxazoline) resulted in polyesters of almost similar molecular weight. In addition, when excess amounts of the chain extender were added and the reaction conditions were fixed, the ratio of the coupled carboxyl terminals to the initial carboxyl terminals became constant regardless of the initial molecular weight and carboxyl content (CV). The results indicate that the chain-extended polyesters possess predetermined molecular weight and CV, both of which depend only on the molecular weight and CV of the initial polymers, and not on the amount of the chain extender added.