Abstract

In this article, we reported a new strategy to synthesize of isosorbide-based copolycarbonates with good flexibility and tunable thermal property via one-pot direct melt polycondensation of isosorbide (ISB), dimethyl carbonate (DMC) and 1,4-benzenedimethanol (BDM). The effect of different feed ratio on the chemical structure, molecular weight, thermal and mechanical property of copolycarbonates was in-depth studied. A series of metal ion-containing compounds as catalysts were used, and the copolycarbonates was synthesized with weight average molecular weight (M_w) of 80,300 and dispersity index below 1.78 by sodium tert-butoxide catalyst, and the reaction time was shorted to only 3.5 h with the ISB conversion up to 99.0%. Meanwhile, the T_g values realized controllable and tunable from 69 to 164 °C by varying the ratio of two diol monomers, and the influence of the structure of carbonyl carbon in repeating units of copolycarbonates on the thermal properties were demonstrated. Moreover, the results of dynamic mechanical analysis (DMA) implied that the flexibility of copolycarbonates was increased with increasing BDM content, and the results of scratch resistance and melting index of the copolycarbonates provided enormous prospect for the industrial application.

摘要

在本文中，我们报告了一种新的策略，该方法通过一锅法直接将异山梨醇（ISB），碳酸二甲酯（DMC）和1,4-苯二甲醇（BDM）进行直接熔融缩聚，从而合成具有良好柔韧性和可调热性能的异山梨醇基共聚碳酸酯。深入研究了不同进料比对共聚碳酸酯的化学结构，分子量，热力学性能的影响。使用一系列含金属离子的化合物作为催化剂，并用叔丁醇钠催化剂合成了重均分子量（M _w）为80,300，分散指数低于1.78的共聚碳酸酯，反应时间仅缩短至3.5 h的ISB转换率高达99.0％。同时，T _g通过改变两种二醇单体的比例，可在69至164°C的温度范围内实现可控制和可调的值，并证明了共聚碳酸酯重复单元中羰基碳的结构对热性能的影响。此外，动态力学分析（DMA）的结果表明，共聚碳酸酯的柔性随着BDM含量的增加而增加，并且其耐刮擦性和熔融指数的结果为工业应用提供了广阔的前景。