采用新的合成方法,以异山梨醇(IS)和氯甲酸三氯甲酯(TCF)为原料,合成了高相对分子质量的生物质聚异山梨醇碳酸酯(PIC),考察了原料配比和反应温度对产品相对分子质量的影响。采用傅里叶变换红外光谱仪、核磁共振氢谱仪、热重分析仪和凝胶渗透色谱仪分别对产物的结构、热稳定性和相对分子质量进行了表征。结果表明:在IS与TCF摩尔比为1∶0.59,反应温度5℃的条件下,合成的PIC数均分子量(Mn)达到53172(远高于用碳酸二苯酯合成的Mn 18300),玻璃化转变温度为118℃,失重5%时热分解温度为326℃,产品透明度良好、热稳定性高。
A high molecular weight poly (isosobide carbonate) (PIC) derived from biomass was synthesized with a new method using isosorbide (IS) and trichloromethyl chloroformate (TCF) as raw materials.The influences of reaction temperature and raw materials ratio on the molecular weight of PIC were investigated.FT-IR,1H-NMR,thermogravimetric (TG) and gel permeation chromatography (GPC) were used to characterize the structure,thermostability and molecular weight of products.The results showed that when the molar ratio of IS and TCF as 1∶0.59,reacting at 5℃,the number average molecular weight(Mn) of PIC was up to 53172(far higher than reported data of 18300) with a Tg of 118℃ and Td,5% of 326℃,exhibited good transparency and thermostability.
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