通过聚乙二醇单甲醚(MPEG)与马来酸酐反应制备具有双端基活性的聚乙二醇单甲醚单马来酸酯(MPEGMA )。利用 POM 研究了 MPEG 和MPEGMA 的结晶形态,结果表明 MPEG 和 MPEG-MA 都存在十字消光现象,但两者结晶形态存在差别。用 DSC 技术研究了非等温结晶动力学,用 Jeziorny 法和 Mo 法描述了 MPEG 和 MPEGMA 非等温结晶动力学,研究表明随降温速率的增大,两种材料的结晶速率均增大；MPEG 的端羟基与马来酸酐发生酯化反应完成端基转化后,MPEG 原有的分子运动受到抑制,导致端基转化产物 MPEGMA 的结晶速率降低, MPEGMA 与 MPEG 结晶成核方式和生长机理产生差异。
Mono polyethylene glycol maleate(MPEGMA)was synthesized by esterification of malefic anhydride and Methoxy polyethylene glycols(MPEG).The crystal morphology of Methoxy PolyEthylene Glycol and Mono Polyethylene Glycol maleate were studied using POM,the results shows that there is cross extinction phenom-menon both in MPEG and MPEGMA,but there is a difference in the crystalline form.The non-isothermal crys-tallization kinetics of MPEG and MPEGMA was investigated by DSC,and described by Jeziorny and Mo,the studies shows that with the increase of cooling rate,the crystallization rate of the two materials are increased. After transforming end-group by esterification between MPEG and MA,the original molecular motion of MPEG was inhibited,which lead to the crrystallization rate of therminal group conversion products-MPEGMA decreased,making differences in nucleation model and growth mechanism of crystallization for MPEGMA and MPEG.
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