以乙酰丙酮锂（LiAcac）为催化剂，脂肪族直链二醇（1，4-丁二醇、1，5-戊二醇、1，6-己二醇和1，8-辛二醇）、异山梨醇（IS）和碳酸二苯酯（DPC）为原料，通过熔融酯交换法合成了一系列脂肪族二醇/异山梨醇共聚碳酸酯（PIAC），产品特性黏数为48.3~85.7 mL/g。考察了不同1，4-丁二醇/异山梨醇投料摩尔比对合成反应的影响。结果表明，随丁二醇用量的增大，热稳定性降低，共聚产品T_g下降，但分子链的柔韧性增强，产品力学性能得到改善。同时考察了等摩尔不同种类的直链二醇对性能的影响，结果表明，随着分子链中二醇亚甲基数的增加，共聚产品T_g逐渐降低，但热稳定性逐渐提高，分子链力学性能明显增强，1，8-辛二醇改性产品的断裂伸长率达到575.2%。

A series of polymerized isosorbide/aliphatic diols carbonates (PIACs) with characteristic viscosity numbers ranging from 48.3-85.7 mL·g^-1 are synthesized through melt transesterification with LiAcac as catalyst,and aliphatic straight chain diols (1,4-butanediol,1,5-amyl glycol,1,6-hexanediol and 1,8-octanediol),isosorbide and diphenyl carbonate as raw materials.The effects of different mole ratios of 1,4-butanediol/isosorbide are investigated,indicating that the increase in the amount of butanediol leads to a reduction in thermal stability and T_g of the copolymer,but enhances the flexibility of the molecular chain and improves the mechanical properties of the copolymer.The effects of different equimolar aliphatic diols on the properties of the copolymer are also investigated,showing that the increase of the number of methylene groups in the molecular chain can cause the thermal stability of the copolymer to increase gradually,help the mechanical properties of the molecular chains to increase obviously but make T_g of the copolymer decrease gradually.The elongation at break of the copolymer modified by 1,8-octanediol modified products reaches 575.2%.

陈柳(1993-),女,硕士研究生,主要从事高分子材料研究,emon17@126.com。