摘要
提出了用导波光学方法测量交联型聚合物材料的交联温度。即在对聚合物薄膜处理时,利用光波导的衰减全反射光谱中导模峰对聚合物材料的折射率敏感的特性,来测量聚合物材料参量。研究了交联型聚氨基甲酸酯材料在升温过程中薄膜折射率的变化。实验结果发现,温度相关的折射率dn/dT会发生不连续变化。整个dn/dT曲线有两个交叉点,这两个交叉点之间的温度范围就是聚合物材料的交联温度范围。第一个和第二个交叉点的温度分别被称之为材料的开始交联温度和完全交联温度。测得的交联型聚氨基甲酸酯材料的交联温度即最佳极化温度范围为85～122℃。通过对不同极化条件(是指开始极化的温度在测得的交联温度范围中变化)下聚氨基甲酸酯材料电光系数的测量验证了交联温度测量结果的准确性。
Guided-wave optics method is used to determine the temperature of the crosslinking polymer films. In the parameters of polymer films are determined according as the guided modes peaks in the attenuated total reflection spectrum depend strongly on the refractive index of polymer films. The refractive index change of the crosslinkable polyurethane is investigated with the ascending temperature. Experimental results show that the curve for the change of refradive index with temperature dn/dT evolues uncontinously, and there exist two intersection points. The temperature range between the two intersection points is regarded as the polymeric crosslinking temperature range. The first and second intersection point are regarded as the beginning temperature of crosslinking and the completing temperature of crosslinking, respectively. The crosslinking temperature range of the polyurethane, namely optimal poling temperature range, is from 85℃ to 122℃. The measured result is examined and convinced by the measurement of electro-optic coefficient of the poled polyurethane film with several temperatures in the range of crosslinking temperature at which the poling process starts.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2007年第3期410-413,共4页
Acta Optica Sinica
基金
国家自然科学基金(60237010)资助课题。
关键词
光波导
交联温度
衰减全反射
折射率
optical waveguide
crosslinking temperature
attenuated total reflection
refractive index
