【作者】 李光珠； 王连才； 曾心苗； 李淑凤； 曹巍； 翟彤；

【Author】 Li Guangzhu,Wang Liancai,Zeng Xinmiao,Li Shufeng,Cao Wei,Zhai Tong (Beijing Radiation Center of Research and Application,Beijing,China,100012)

【机构】 北京市射线应用研究中心；

【摘要】 本文利用多亚甲基多苯基多异氰酸酯(PAPI)与芳香二酐的反应取代合成聚酰亚胺最普遍使用的二胺与二酐的反应来制备聚酰亚胺泡沫,并通过微波(2450MHz)辐照设备和真空烘箱进行固化和热酰亚胺化。过程如下:3,3′,4,4′-二苯甲酮四羧酸二酐(BTDA)溶解在适量N,N’-二甲基甲酰胺(DMF)中,逐渐升温并保持温度在120℃,搅拌溶液。待溶液澄清后,向溶液中加入适量的催化剂、表面活性剂、甲醇和去离子水,充分搅拌形成前体溶液Ⅰ。将前体溶液Ⅰ与PAPI按一定质量比混合,快速搅拌5～10秒后,注入模具中,使之发泡。待泡沫脱粘后,使用功率为3KW微波炉辐照2小时进行固化。最后,通过真空烘箱在250℃处理2h使之完全酰亚胺化而制得琥珀色柔软聚酰亚胺泡沫。更多还原

【Abstract】 In this study,we prepared polyimide foams by the reaction of aromatic dianhydride and polyaryl polymethylene isocyanate(PAPI),and cured the foamed product via microwave irradiation and thermal energy.The polymerization procedures are as follow:benzophenone tetracarboxylic dianhydride(BTDA) was dissolved in appropriate amount of dimethyl formamide(DMF),the solution was held at 120℃and stirred until the solution became clear.Then appropriate amount of catalysts,surfactant,methanol,and deionized water were added into the solution and stirred to form the solution-state precursor.The precursor and PAPI solution were mixed vigorously for approximately 5-10 seconds and poured into the mold,and then the content began to rise/foam.Once the foam was somewhat rigid,it was cured in a 3- kilowatt microwave oven adjustable on 60% power for 2h and cured in vacuum oven at 250℃for 2h to be fully imidized.The resultant foam was amber in color and very soft with low density.更多还原