PU／PGMA同步互穿网络的固化反应动力学

研究各种动力学因素对同步互穿网络形成的影响。方法用傅里叶红外光谱法跟踪聚氨酯中ＮＣＯ基团及甲基丙烯酸缩水甘油酯中Ｃ＝Ｃ基团特征吸收峰的变化，分别得到其转化率与时间曲线。结果与结论研究了互穿网络中各组分与纯组分反应情况的差异；ＳＩＮ中ＰＵ和ＰＧＭＡ反应均为二级动力学反应，其反应活化能分别为２８．１和３５．６ｋＪ／ｍｏｌ；当改变ＰＵ催化剂时，根据红外跟踪得到转化率曲线，由转化率与凝胶点之间的关系对不同

Kinetic Study on Simultaneous Interpenetrating Network of Polyurethane and Poly(glycidyl methacrylate)

Aim To study the effect of various kinetic factors on the formation of simultaneous interpenetrating network(SIN). Methods The consuming of NCO group of PU and CC group of GMA was monitored through FTIR to obtain the conversion rate vs. time curves. Results and Conclusion The difference between the reaction situations of the respective component in SIN and the pure respective component was investigated. The PU and PGMA reactions in plasticized SIN all follow the second order kinetic mechanism and their activation energies are 28 1 and 35 6 kJ/mol respectively. As the PU catalyst was changed, the different gelation sequences are determined according to the conversion rate curve obtained through FTIR and the relation between conversion rate and gelation point.