摘要
为了提高聚酰亚胺材(PI)料的耐热性能,以2,6-二(对氨基苯)苯并[1,2-d;5,4-d']二噁唑为单体,采用两步法与均苯四甲酸二酐(PMDA)合成出了新型聚酰亚胺薄膜。采用红外光谱、热分析等手段对其结构与性能进行了表征。测定了聚酰亚胺的预聚体-聚酰胺酸(PAA)的特性黏度达到1.18dL/g,玻璃化温度343℃,在空气中热失重温度为626℃,表现出优异的热氧化稳定性。评价了聚酰亚胺在各种溶剂中的溶解性能,均不溶于常规的极性溶剂,甚至在浓硫酸中也不溶解。经红外光谱测定,聚酰胺酸基本转化成聚酰亚胺。
An aromatic polyimide based on 2,6 - bis （ p - aminophenyl） - benzo [ 1,2 - d ; 5,4 - d′] bisoxazole had been synthesized via a conventional two - stage procedure with PMDA in order to improve its thermal stability. The structure and properties of the polyimide were characterized by FT- IR, DSC and TG. The poly（ amic -acid） which was the prepolymer of polyimide had a inherent viscosity of 1.18dL/g and could be thermally converted into a yellow film. The glass transition temperatures （Tg） was 343℃, and the weight -loss temperature was 626℃ in air atmosphere, which showed an excellent thermal stability. The solubility of the polyimide in various solvents was evaluated, it would not solute in common polar solvent, even in concentrated sulfuric acid. The IR spectra identified that the poly （amic acid） basically converted into polyimide.
出处
《化学与粘合》
CAS
2007年第5期347-350,共4页
Chemistry and Adhesion
基金
黑龙江省杰出青年基金资助(编号:JC04-12)
关键词
苯并噁唑环
均苯四甲酸二酐
聚酰亚胺
制备
2,6 - benzobisoxazole units
pyromellitic dianhydride
polyimide
synthesis
