摘要
通过两步法分别在75、80和85℃下合成了聚四氢呋喃醚二醇/4,4'-二苯基甲烷二异氰酸酯(PTMG-MDI)型聚氨酯弹性体,并通过红外光谱(IR)、核磁共振氢谱(1H-NMR)和高效液相色谱(HPLC)分析了该弹性体的结构。结果表明:在75℃和80℃合成的聚氨酯弹性体内部结构相同,只不过后者的分子量相对较高;而85℃合成的聚氨酯弹性体内部出现了支化结构,HPLC分析表明其在预聚阶段就发生了支化反应。另外通过力学性能测试发现,80℃合成的聚氨酯弹性体性能最优,表明PTMG-MDI型聚氨酯弹性体的最佳合成温度为80℃。
The polytetramethylene ether glycol/4,4＇-diphenylmethane-diisocyanate（PTMG-MDI） type polyurethane elastomer was synthesized through two-step method under 75, 80 and 85℃. The internal structure of the polyurethane elastomer was analyzed through infrared spectrum（IR）, proton nuclear magnetic resonance spectra（1H-NMR） and high performance liquid chromatography（HPLC）. The results show that： the polyurethane elastomers which synthesized at 75 and 80℃ have the same internal structure, and the latter shows a higher molecular weight. But when the temperature is 85℃, the polyurethane elastomer contains branched structure, and the results of HPLC analysis indicate that the branching reaction has taken place at the performed stage. Moreover, the test results of mechanical properties show that： the best synthesis temperature of the polyurethane elastomer is 80℃, and the product has the optimal performance.
出处
《塑料科技》
CAS
北大核心
2017年第1期46-50,共5页
Plastics Science and Technology
