论文部分内容阅读
合成了AB型顺式聚对苯撑苯并二噁唑(PBO)新单体:5-氨基-6-羟基-2-(对甲氧羰基苯基)苯并噁唑(MAB)和5-氨基-6-羟基-2-(对羧基苯基)苯并噁唑(ABA),阐述了AB型新单体的分子结构特征,并测定了抗氧化及热分解性能,探索了新单体在自缩聚反应制备PBO树脂中的应用。结果表明:采用以4-氨基-6硝基间苯二酚盐酸盐和对苯二甲酸单甲酯为原料,依次经酰氯化、缩环合、加氢还原及其碱性水解的合成路线,可分别成功地获得纯度98%的MAB和99%的ABA,它们在高温均缩聚的应用中无需抗氧剂即可方便制得PBO树脂。最后为进一步提升PBO材料的性能,以新的思路提出PBO改性等方面的研究途径。
A new class of cis-p-phenylenebenzobisoxazole (PBO) AB monomer was synthesized: 5-amino-6-hydroxy-2- (p- methoxycarbonylphenyl) benzoxazole (MAB) Amino-6-hydroxy-2- (p-carboxyphenyl) benzoxazole (ABA). The molecular structure characteristics of new type AB monomer were described. The antioxidative and thermal decomposition properties were also investigated. Application of Polycondensation to PBO Resin. The results showed that the synthetic routes of 4-amino-6-nitro-resorcinol hydrochloride and monomethyl terephthalate as raw materials were followed by acid chlorination, condensation reaction, hydrogenation and alkaline hydrolysis Successfully obtained 98% pure MAB and 99% ABA, respectively, which are readily prepared without the need for antioxidants in high-temperature homopolymerization applications. Finally, in order to further enhance the performance of PBO materials, a new way of research on PBO modification is put forward.