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首页> 外文期刊>Journal of Applied Polymer Science >Kinetic study on the reaction of 2,4-and 2,6-tolylene diisocyanate with 1-butanol in the presence of styrene, as a model reaction for the process that yields interpenetrating polyurethane-polyester networks
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Kinetic study on the reaction of 2,4-and 2,6-tolylene diisocyanate with 1-butanol in the presence of styrene, as a model reaction for the process that yields interpenetrating polyurethane-polyester networks

机译：在苯乙烯存在下2,4-和2,6-甲苯二异氰酸酯与1-丁醇反应的动力学研究，作为生成互穿聚氨酯-聚酯网络的过程的模型反应

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A classical method was utilized for determination of free isocyanates to study the kinetics of a model reaction of 2,4- and 2,6-tolylene diisocyanate (TDI) with I-butanol, which was run in the reaction medium of liquid aliphatic hydrocarbons. Such conditions made it possible to find rate constants and activation energy values for the second-order reactions under isothermal conditions. Those reactions can be employed to produce isocyanate prepolymers, which make intermediates for downstream polyurethanes. The findings are commented upon against the background of earlier kinetic data that can widely be found in the research reports published. Further, part of our work utilized the findings to provide interpretation of kinetic parameters for analogous reactions, the kinetic data being found in the presence of styrene-the monomer employed when producing polyurethane-polyester interpenetrating polymer network (IPN) systems. The hypothesis was put forward that styrene and isocyanate component(s) could react at the final stages of the process when the system becomes short in the hydroxyl substrate. That hypothesis was based on disturbances observed in the reactivity of -NCO groups (in 2,4-TDI) in the reaction system studied. The rate constants and activation energy values were determined and presented for the urethanization reaction of 1-butanol. (C) 2003 Wiley Periodicals, Inc. [References: 23]
机译：利用经典方法测定游离异氰酸酯，以研究2，4-和2，6-甲苯二异氰酸酯（TDI）与异丁醇的模型反应动力学，该模型在液态脂肪烃的反应介质中进行。这样的条件使得可以找到等温条件下二阶反应的速率常数和活化能值。那些反应可用于生产异氰酸酯预聚物，其制备下游聚氨酯的中间体。在较早的动力学数据的背景下对这些发现进行了评论，这些数据可以广泛地发表在研究报告中。此外，我们的工作的一部分利用这些发现为类似反应提供动力学参数的解释，该动力学数据是在苯乙烯-生产聚氨酯-聚酯互穿聚合物网络（IPN）系统时使用的单体存在下发现的。提出了这样的假设：当体系中的羟基底物变短时，苯乙烯和异氰酸酯组分可能在反应的最后阶段反应。该假设基于所研究的反应系统中-NCO基团（在2,4-TDI中）的反应性受到干扰。确定了速率常数和活化能值，并给出了1-丁醇的氨基甲酸酯化反应。 （C）2003 Wiley Periodicals，Inc. [参考：23]

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