对交联型极化聚合物交联温度的实时测量

Real time measurement of cross-linking temperature for cross-linked polymer

交联型聚合物要取得良好的极化效果,要求尽量保证极化取向过程与交联过程的同时进行。准确界定交联过程发生的温度段对于极化效果至关重要,为此提出了一种实时测量交联型极化聚合物交联温度的方法。实验利用基于衰减全反射原理制作的CCD监控系统,监控了交联型聚合物聚氨酯升温过程中薄膜厚度以及折射率的变化。发现在80℃附近以及130℃附近,由于聚氨酯发生交联反应所带来的影响,厚度以及折射率曲线斜率均发生突变,由此得出聚氨酯的交联温度范围即最佳极化温度范围为80℃-130℃。界定交联过程的温度范围,有助于优化交联型聚合物材料的极化条件。

In order to achieve good poling efficiency of cross-linked polymer, the poling process and cross-linking process should go on simultaneously as possible. The temperature range of cross-linking process is very important to poling efficiency. For this reason a real time measurement method for measuring the cross-linking temperature of cross-linked polymer is proposed. Experiments show that when heating up the cross-linked polyurethane at about 80° C and at 130° C around, a transition of both slope of polymer's thickness and refractive index will occur which can be detected and recorded by a real-time CCD detecting system based on attenuated total reflection technique. This phenomenon represents the beginning and ending of cross-linking process i.e. the optimal temperature range of polyurethane is 80°C-130°C. Defining the temperature range of the cross-linking process would be very helpful to optimize the poling conditions of the corresponding cross-linked polymer.