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A novel polycarbonate urethane was synthesized by the two-stage solution process of diisocyanates with polycarbonate diols(PCDL),in which PCDL,1,4-butanediol(BD) and mixture of 4,4'-methylenediphenyl diisocy-anate and hexamethylene diisocyanate(HDI) were soft segment,chain extender and rigid segment,respectively.The structures were characterized by using FTIR and 1H-NMR.The thermoanalysis and mechanical properties of products were measured by means of DSC,TG and other systems.The result shows that an import... 相似文献
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研究了六次甲基四胺的过渡金属配合物的固相合成及其热色性.实验发现固相合成较液相合成具有产率高、合成简便等优点.利用热重-差热分析(TG-DSC)探讨了配合物的变色机理,发现热色性是由于加热前后配位场强度的改变所致. 相似文献
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对凝固点降低法测定摩尔质量的实验装置进行了改进.实验结果表明,改进后的装置操作方便,所得结果准确、重现性好.以环己烷作溶剂、萘为溶质测得萘摩尔质量的相对误差均在1%以内. 相似文献
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