m,m′-二氨基二苯酮与均苯四酸二酐的微波辐射聚合

POLYMERIZATION OF m,m′-DIAMINOBENZOPHENONE AND PYROMELLITIC DIANHYDRIDE BY MICROWAVE RADIATION

研究 m,m′-二氨基二苯酮 (m,m′- DABP)与均苯四酸二酐 (PMDA)的缩聚及亚酰化 ,并运用微波辐射和常规加热两种方式对反应进行了比较。考察了微波辐射时间 (功率 )、单体浓度、单体配比和温度等因素对缩聚物的特性粘数、转化率的影响。用红外光谱对亚酰化度进行了表征 ,并用简并四波混频技术首次测量了该缩聚物的三阶光学非线性极化率系数及其响应时间。实验结果表明 ,微波辐射对提高聚合物的特性粘数和转化率都有显著作用 ;合成的缩聚物具有较大的三阶光学非线性极化率系数 (聚酰亚胺的 χ(3) =1.642× 10 -13 esu)和较快的时间响应

Polycondensation and imidization of m,m′ diaminobenzophenone and pyromellitic dianhydride under microwave irradiation were studied. The imidization degree of polyimide was characterized by Infrared absorption spectrum. The effect of microwave irradiation time(power), the composition of monomer, the concentration of monomer and the temperature on the intrinsic viscosity and the conversion of polymer were studied. At the same time, the microwave radiation polymerization with thermopolymerization was compared. The polycondensate′s third order optical nonlinearities and time responses were measured by Picosecond forward three dimensional degenerate four wave mixing technique for the first time. The results show that the intrinsic viscosity and the conversion of polymer are improved greatly by microwave radiation, the polycondensate prepared has high third order nonlinear optical coefficients (PAA χ (3) = 1.642 ×10 -13 esu) and fast time responses (19 ps).