摘要
以3,5-二硝基苯甲酰氯和邻氨基苯酚为原料合成了含苯并噁唑基团的二胺,然后将其与二氨基二苯醚(ODA)和二苯醚四甲酸二酐(ODPA)进行常温共聚合成聚酰胺酸,最后采用两步法合成了含苯并噁唑支链的可溶性聚酰亚胺(PI)。采用红外光谱(FT-IR)、差示扫描量热法(DSC)和热重分析(TGA)等测试手段分析了该PI的结构、热性能和在各溶剂中的溶解性能。实验结果表明,经300℃热处理1h后,聚酰胺酸转化为酰亚胺化比较完全;引入苯并噁唑支链基团可以提高PI的耐热性,其玻璃化转变温度(Tg)在300℃左右,初始热分解温度为552.5℃;该PI在强极性溶剂中溶解性能良好,但不溶于一般的极性溶剂中,说明其在提高加工性能的同时仍能保持耐一般溶剂的性能。
The diamine with benzoxazole group was synthesized with the 3,5-dinitrobenzoyl chloride and o-aminophenol as raw material, then the polyamide acid was synthesized by copolymerization at ambient temperature between the diamine with benzoxazole group, diaminodiphenyl ether（ODA ） and tetracarboxydiphthalic ether dianhydride（ODPA）. Finally the soluble polyimide（PI） with benzoxazole branched chain was synthesized by twostep method. The PI＇s structure, thermal characteristics and solubility in various solvent were analyzed respectively by FT-IR, DSC, TGA and other testing methods. The experiment results showed that the polyamide acid could more fully translate into imide after heat treatment at 300 ℃ for 1 h. The PI＇s thermal stability was improved when the benzoxazole with branched chain was introduced, its glass transition temperature（Ts） was about 300 ℃, and initial thermal decomposition temperature was 552.5 ℃. The PI which had better processing performance could still keep better solvent resistance for common solvent because the PI＇s solubility was better in strong polar solvent, but PI can＇t dissolve in common polar solvent.
出处
《中国胶粘剂》
CAS
北大核心
2009年第1期6-10,共5页
China Adhesives
