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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。
It is proposed to measure the cross-linking temperature of the cross-linked polymeric material by guided-wave optics. That is, the polymer material parameters are measured by using the property that the guided mode peak in the attenuated total reflection spectrum of the optical waveguide is sensitive to the refractive index of the polymer material when the polymer film is processed. The changes of the refractive index of the film during the heating process of the crosslinked polyurethane were studied. The experimental results show that the temperature-dependent refractive index dn / dT will change discontinuously. The entire dn / dT curve has two points of intersection, and the temperature range between the two points of intersection is the cross-linking temperature range of the polymer material. The temperatures at the first and second crossover points are called the initial and complete crosslinking temperature of the material, respectively. The measured crosslinking temperature of the crosslinked polyurethane material, that is, the optimum polarization temperature ranged from 85 to 122 ° C. The accuracy of the cross-linking temperature measurement was verified by measuring the electro-optic coefficient of the polyurethane material for different polarization conditions (which means the temperature at which polarization begins to change in the measured cross-linking temperature range).