三阶非线性光学材料聚氨酯-酰亚胺的合成研究

以甲苯-2，4-二异氰酸酯（TDI）和分散红-19（DR-19）合成含染料发色团的聚氨酯，进一步和二酐单体均苯四甲酸二酐（PMDA）缩合生成具有光学性能的聚氨酯-酰亚胺（PUI）；采用红外光谱（FT—IR）、示差量热扫描（DSC）、热失重分析（TGA）等手段对合成的PUI进行了表征。示差扫描量热和热失重分析结果显示，其玻璃化转变温度（％）为194℃，在5％的热失重温度为217℃，表明具有很好的热稳定性；测定了聚合物的发色团密度，其结果和理论计算值非常接近，表明聚合反应是按计量进行的；采用简单的比色法测定了聚合物材料的三阶非线性光学系数Х^（3）为2．42×10^14esu。

Synthesis of Third-order Nonlinear Optical Material of Poly(urethane-imide)

The polyurethane containing dioxynitrostilbenyl groups as NLO - chromophores was synthesized by toluene diisocyanate （TDI） and dispersed red 19 （DR-19）, then it was used to synthesized poly （urethaneimide） （PUI）with pyromellitic dianhydride （ PMDA ）.The PUI was characterized by infrared spectrum （FT - IR）, differential scanning calorimeter （DSC） and thermal gravimetric analysis （TGA）.The results of DSC and TGA indicated that the PUI exhibited high thermal stability up to its glasstransition temperature （Tg） of 194℃ and 5% heat loss temperature of 217℃ .At the same time, the chromophore density of PUI was measured, and was found to be expected. In addition, the third - order non- linear optical coefficient by spectrophotometry was determined.