文章摘要
异氰酸酯一步法制备聚酰亚胺模塑粉的分析表征和模压性质
Analysis, Characterization and Moldability of Polyimide Molding Powders by One-Step Prepared From Isocyanate
  
DOI:10.16865/j.cnki.1000-7555.2018.06.015
中文关键词: 异氰酸酯法  聚酰亚胺  模塑粉  热稳定性  粒径分布
英文关键词: isocyanate method  polyimide  molding powder  thermal stability  particle size distribution
基金项目:国家自然科学基金资助项目(51273054)
作者单位
钱 莹, 陆 飞, 陈 杨, 史铁钧, 何 涛 合肥工业大学 化学与化工学院安徽 合肥 230009 
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中文摘要:
      使用联苯四甲酸二酐(BPDA)、4,4′-二苯甲烷二异氰酸酯(MDI)、均苯四甲酸二酐(PMDA)和2,4-甲苯二异氰酸酯(TDI),通过异氰酸酯法制备了4种具有不同分子结构的聚酰亚胺(PI)胶体,经水洗、干燥后得PI模塑粉。用二正丁胺法测定生成七元环阶段的反应终点时间为4 h;用红外光谱法分析了PI模塑粉的化学结构,证实所得为目标产物;用热重分析了PI模塑粉的热稳定性,用动态力学热分析测试表征了PI模塑粉的耐热性;用激光粒度分析表征了PI模塑粉的粒径分布,用平板硫化机对PI模塑粉进行了模压成型。结果表明,用BPDA、MDI制备的PI模塑粉热稳定性最好,失重5%的温度为526 ℃;用PMDA、MDI和TDI制备的PI模塑粉玻璃化转变温度(Tg)最高,为419 ℃;PI模塑粉粒径分布为双峰分布;模压温度对模压制品的性能和外观有很大的影响。
英文摘要:
      Four polyimide (PI) colloids with different molecular structures were prepared by isocyanate method using biphenyltetracarboxylicdianhydride (BPDA), 4,4′-diphenylmethane diisocyanate (MDI), pyromelliticdianhydride (PMDA) and 2,4-toluene diisocyanate (TDI) . PI molding powders were obtained after colloids were washed with water and dried. The reaction end time of the seven-membered ring phase was determined by the di-n-butylaminemethod which is 4 h. The PI molding powder were successfully synthesized manifested from the structure confirmed by FT-IR. The thermal stability and heat resistance of PI molding powders were characterized by TGA and DMA respectively. The particle size distribution of PI molding powder was characterized by laser granulometer, and PI molding powders were molded by plate vulcanization machine. The results show that the PI molding powder prepared with BPDA and MDI has the best thermal stability, the temperature of 5% mass loss is 526 ℃. The glass transition temperature (Tg) of PI molding powder prepared with PMDA, MDI and TDI is the highest, that is 419 ℃. Double peaks exist in the range of particle size distribution of the PI molding powders. Molding temperature has a great impact on the product performance and appearance.
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