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通过均苯四甲酸二酐(PMDA)与4,4-二氨基二苯基醚(ODA)缩聚反应制备出聚酰胺酸(PAA),而后采用溶胶-凝胶(sol-gel)法和超声波机械共混法制备出含纳米二氧化硅(nano-SiO2)、纳米三氧化铝(nano-Al2O3)、纳米二氧化钛(nano-TiO2)不同量的PPA/无机纳米共混胶液,经高温亚胺化得到聚酰亚胺(PI)/无机纳米复合材料。利用热学综合分析仪,在N2的保护下,以1℃/min升温速度,对复合材料的热失重、分解温度等热学性能进行分析比较。结果表明:无机纳米颗粒对聚酰亚胺材料的热失重温度的影响较小,提高聚酰亚胺的热失重、分解温度需要从改善聚酰亚胺分子结构出发。
The polyamic acid (PAA) was prepared by polycondensation of pyromellitic dianhydride (PMDA) and 4,4-diaminodiphenyl ether (ODA), and then the sol-gel method and ultrasonic mechanical The blends were prepared with different amounts of PPA / inorganic nanocomposite glue containing nano-SiO2, nano-Al2O3 and nano-TiO2, A polyimide (PI) / inorganic nanocomposite was obtained. Using thermal comprehensive analyzer, under the protection of N2, with the heating rate of 1 ℃ / min, the thermal properties of composites such as TG, decomposition temperature were analyzed and compared. The results show that the effect of inorganic nanoparticles on the thermogravimetric temperature of polyimide is small, and it is necessary to improve the molecular structure of polyimide by improving the thermal weight loss and the decomposition temperature of polyimide.