【摘要】 3,4′-二胺基二苯醚（3,4′-ODA）,3,3′,4,4′-联苯四甲酸二酐（BPDA）和分散红1（DR1）合成了有机聚合物聚酰亚胺;用傅里叶红外光谱、紫外-可见光谱等分析手段对聚酰亚胺进行了结构表征,采用示差扫描量（DSC）、热失重分析（TGA）进行了热稳定性表征。示差扫描量热和热失重分析结果显示,该聚酰亚胺的玻璃化转变温度（Tg）为288℃,在5%的热失重温度为294℃,表明具有非常好的热稳定性。测定了材料在复合光光照射下的折射率（n）和热光系数（dn/dT）;通过热光系数的测量,计算了聚合物的介电常数（ε）、介电热光系数（dε/dT）、体积热膨胀系数β和（dβ/dT）值。该聚合物材料在复合光下的热光系数（dn/dT）值为-2.2714～-2.408 6×10^-4℃^-1,体积热膨胀系数变化率（dβ/dT）为2.19～2.51×10^-7K^-1,对研制新型数字热光开关材料具有一定的意义。更多还原

【Abstract】 The organic polymer polyimide which using 3,4’-Diaminodiphenyl Ether（3,4’-ODA）,3,3’,4,4’- Bisphenyltetracarboxylic（BPDA）and dispersed red 1（DR1）,is synthesized.The chemical structure of polyimide is characterized by FT-IR and UV-Vis spectroscopy.The thermal properties are characterized using the differential scanning calorimeter（DSC）and thermal gravimetric analysis（TGA）.The DSC and TGA exhibited high Tg and the temperature at which 5% mass loss occurred of polyimide were 288 and 294℃,respectively.The material has good thermal stability.The measurements of refractive index（n）and thermo-optic coefficient（dn/dT）of polyimide are demonstrated at complex light.The values of n and dn/dT are used to calculated the dielectric constant（ε）,its variation with temperature（dε/dT）,volume expansion coefficient（β）and（dβ/dT）.The dn/dT and dβ/dT are -2.271 4～-2.408 6×10^-4·C^-1 and 2.19～2.51×10^-7℃^-1.The conclusion had a little significance to develop new the digital optical switch（DOS）.更多还原