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1.以顺式和反式丁烯二酸二乙酯为模型化合物,确定表征聚酯中顺、反构型的红外光谱特征吸收带。顺式为825,1410和3052厘米~(-1),反式为780,1371和3072厘米~(-1)。 2.测定一系列顺式聚酯和反式聚酯混合弑样在825和780厘米(-1)的光密度比值,得到可以定量顺、反构型的工作曲线。 3.缩聚反应温度和反应时间对顺-反异构化有显著的影响。提高温度和延长反应时间都会增加聚酯中反式构型的含量。顺-反异构化反应系属一极反应,反应活化能为19千卡/克分子。 4.在顺丁烯二酸酐和乙二醇的缩聚过程中反式构型的增多是聚合物粘度增大的主要因素。
1. To cis and trans-butenedioic acid diethyl ester model compounds, to identify polyester cis and anti-configuration of the infrared spectral absorption bands. Cis to 825, 1410 and 3052 cm -1, trans to 780, 1371 and 3072 cm -1. 2. Determination of a series of cis-polyester and trans-polyester hybrid samples in optical density ratio of 825 and 780 cm (-1), to be able to quantitative cis and anti-configuration of the working curve. 3. Polycondensation reaction temperature and reaction time on the cis-trans isomerization has a significant impact. Increasing the temperature and prolonging the reaction time increase the trans configuration in the polyester. Cis-trans isomerization reaction is a one-pole reaction, the activation energy of 19 kcal / mole. 4. The increase in trans configuration during the polycondensation of maleic anhydride and ethylene glycol is a major factor in the increase in the viscosity of the polymer.