【摘要】 用3,3’,4,4’-联苯四甲酸二酐(BPDA)、4,4’-二胺基二苯醚(4,4’-ODA)和分散红1(DR1)合成了可制作光波导器件的聚酰亚胺(PI)有机聚合物,采用示差扫描量热(DSC)、热失重分析(TGA)和紫外吸收光谱等方法对其热稳定性和光学性质进行了表征。DSC和TGA结果显示,该PI的玻璃化转变温度(Tg)为248℃,在5%的热失重温度为285℃,表明具有非常好的热稳定性。演示了用阿贝折射仪测定该材料的折射率(n)和热光系数(dn/dT)的方法;通过改变PI含量的方法,方便地实现了聚合物体系的折射率控制;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)和体积热膨胀系数β及其变化率(dβ/dT)。制得的聚合物材料的dn/dT为-2.2615~-3.7028×10-4K-1,dβ/dT为2.22~6.14×10-7K-1,表明该聚合物在低驱动功率的新型数字热光开关、光通信器件等领域具有潜在的应用前景。更多还原

【Abstract】 The organic polymer(polyimide) which uses 3,3’,4,4’-Bisphenyltetracarboxylic (BPDA),4,4’-Diaminodiphenyl(4,4’-ODA) and dispersed red 1(DR1),was synthesized to make optical waveguide devices.The differential scanning calorimeter(DSC) and thermal gravimetric analysis(TGA) exhibited high Tg and temperature which were 248 and 285 ℃ respectively when 5% mass loss of polyimide occurred.The measurements of refractive index (n) and thermo-optic coefficient (dn/dT) of organic polymer polyimide using Abbé refractometer was demostrated.The values of n and (dn/dT) were used to calculate the dielectric constant (ε),its variation with temperature (dε/dT),volume expansion coefficient (β) and (dβ/dT).The dn/dT and dβ/dT were -2.261 5～-3.702 8×10 -4 K -1 and 2.22～6.14×10 -7 K -1 respectively.The proposed polymer had a little significance to develop new digital optical switch with low driving power and optical communication.更多还原