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借助宏指令发现聚氨酯聚合反应在一定反应程度范围内服从二级反应动力学，催化剂的性质影响二级反应动力学的适用范围。
The reaction order of polyurethane bulk polymerization was found to be 2 below a specific reaction extent which is depended on the nature of the catalyst.
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