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首页> 外文期刊>Journal of Applied Polymer Science >Kinetics of glycidyl azide polymer-based urethane network formation
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Kinetics of glycidyl azide polymer-based urethane network formation

机译：缩水甘油基叠氮化物聚合物氨基甲酸乙酯网络形成的动力学

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摘要

Reactions between hydroxyl-terminated glycidyl azide polymer (GAP) and different isocyanate curatives Such as toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), and methylene diicyclohexyl isocyanate (MDCI) at various temperatures viz. 30, 40, 50, and 60 degrees C were followed by Fourier transform infra red spectroscopy. The reactions were found to follow second-order kinetics. With TDI and IPDI at 30 degrees C, a two-stage reaction was observed. For GAP-TDI system, the second stage was slower than the first while for GAP-IPDI system, the second stage was faster than the first indicating dominance of autocatalytic effect. The stage separation occurred due to the difference in reactivity of the isocyanate groups and was found to narrow down with increase in temperature. The viscosity build Lip due to the curing reaction was followed for GAP-TDI system for comparison. The stage separation was evident in the viscosity build up also. Rheokinetic analysis done based on data generated showed a linear correlation between viscosity build LIP and fractional conversion. The kinetic and activation parameters evaluated from the data showed the relative difference in reactivity of the three diisocyanates with GAP. Both the approaches suggested that the reactivity of the isocyanates employed for the present study could be arranged as TDI > IPDI > MDCI. (c) 2008 Wiley Periodicals, Inc.
机译：羟基封端的缩水甘油叠氮化物聚合物（GAP）与不同的异氰酸酯固化剂如甲苯二异氰酸酯（TDI），异佛尔酮二异氰酸酯（IPDI）和亚甲基二环己基异氰酸酯（MDCI）之间的反应在不同温度下进行。在30、40、50和60摄氏度下进行傅里叶变换红外光谱。发现反应遵循二级动力学。在30摄氏度下使用TDI和IPDI，观察到两阶段反应。对于GAP-TDI系统，第二阶段要比第一阶段慢，而对于GAP-IPDI系统，第二阶段要比第一阶段快，这表明自催化作用占优势。由于异氰酸酯基团的反应性差异而发生阶段分离，并且发现其随着温度升高而变窄。对于GAP-TDI系统，追踪由于固化反应而产生的粘度Lip，以进行比较。阶段分离在粘度增加上也很明显。根据生成的数据进行的流变动力学分析表明，粘度建立LIP与分数转化之间存在线性关系。由数据评估的动力学和活化参数显示了三种二异氰酸酯与GAP的反应性的相对差异。两种方法均表明，可将本研究中使用的异氰酸酯的反应性排列为TDI> IPDI> MDCI。 （c）2008 Wiley期刊公司

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