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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~(-7)K~(-1),对研制新型数字热光开关材料具有一定的意义。
Organic polymerization of 3,4’-diaminodiphenylether (3,4’-ODA), 3,3 ’, 4,4’-biphenyltetracarboxylic dianhydride (BPDA) and Disperse Red 1 (DR1) Polyimide was characterized by means of Fourier transform infrared spectroscopy and ultraviolet-visible spectroscopy. The thermal stability of the polyimide was characterized by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) . Differential scanning calorimetry and thermogravimetric analysis showed that the polyimide had a glass transition temperature (Tg) of 288 ° C and a 5% weight loss temperature of 294 ° C, indicating very good thermal stability. The refractive index (n) and the thermo-optic coefficient (dn / dT) of the material under complex light irradiation were measured. The dielectric constant (ε), dielectric thermal coefficient dε / dT), volumetric thermal expansion coefficient β and (dβ / dT) values. The thermo-optic coefficient (dn / dT) of the polymer material under composite light is -2.2714 ~ -2.408 6 × 10 -4 ℃ -1, the rate of change of volumetric thermal expansion coefficient (dβ / dT) is 2.19 ~ 2.51 × 10 ~ (-7) K ~ (-1), which is of great significance for the development of new digital thermo-optic switch materials.