Chain extenders for polyesters. V. Reactivities of hydroxyl‐addition‐type chain extender; 2,2′‐bis(4h‐3,1‐benzoxazin‐4‐one)
Chain extenders for polyesters. V. Reactivities of hydroxyl‐addition‐type chain extender; 2,2′‐bis(4h‐3,1‐benzoxazin‐4‐one)
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V. 羟基加成型扩链剂的反应性；2,2-双(4h-3,1-苯并恶嗪-4-酮)
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发表时间：
1987
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通讯作者：
Shunichi Matsumura
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作者：
H. Inata;Shunichi Matsumura
在我们的前期研究中，发现1 - 2，2 ′-双（4 H-3，1-苯并恶嗪-4-酮）（BNZ）是通过加成反应偶联线性聚酯羟基末端的最有效扩链剂。用聚对苯二甲酸乙二醇酯和聚对苯二甲酸丁二醇酯作为聚酯，对BNZ化学进行了详细的研究。已经观察到，使用与初始聚合物的羟基末端等量的BNZ导致最高的分子量。与2，2 ′-双（2-恶唑啉）的情况相反，发现其是最有效的羧基加成型扩链剂并且允许其广泛的过量使用，2，3过量使用BNZ导致较低分子量的聚合物。因此，当使用与羟基末端等量的BNZ时，所得聚合物的分子量可由初始聚合物的羧基含量确定，而与其初始分子量无关。
In our previous study,1 2,2′-bis(4H-3,1-benzoxazin-4-one) (BNZ) was found to be most effective among the tested chain extenders in coupling hydroxyl terminals of linear polyesters through addition reaction. Detailed studies on BNZ chemistry have been made using poly(ethylene terephthalate) and poly(butylene terephthalate) as the polyester. It has been observed that use of BNZ, equivalent amount to the hydroxyl terminals of the initial polymer, resulted in the highest molecular weight. In contrast with the case of 2,2′-bis(2-oxazoline), which was found to be the most effective carboxyl-addition type chain extender and a wide range of its excess use was allowed,2,3 an excessive use of BNZ resulted in lower molecular weight polymer. Thus, when an equivalent amount of BNZ to the hydroxyl terminals was used, the molecular weight of the resulting polymer could be determined by the carboxyl content of the initial polymer, regardless of its initial molecular weight.