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通过在聚合过程中添加少量2,5-二羟基对苯二甲酸(DHTA)部分替代对苯二甲酸(TPA)与4,6-二氨基间苯二酚(DAR)盐酸盐进行共聚,合成了一系列大分子链上含有羟基基团的DHPBO共聚物,并制得其初生纤维.利用FTIR、接触角等分析手段对其化学结构和纤维表面性能进行了表征,通过单丝拔出实验和SEM考察了DHPBO纤维与环氧树脂基体的界面剪切强度,并采用轴向压缩弯曲实验和紫外光加速老化实验评价了羟基基团的引入对提高纤维压缩性能和抗紫外性能的影响.结果表明,羟基基团的引入使得DHPBO纤维的表面亲水性、与环氧树脂的界面剪切强度以及纤维的压缩性能和抗紫外性能都有了显著提高.
By copolymerization of terephthalic acid (TPA) and 4,6-diaminoresorcinol (DAR) hydrochloride by partial addition of a small amount of 2,5-dihydroxyterephthalic acid (DHTA) in the polymerization process, A series of DHPBO copolymers with hydroxyl groups on the macromolecular chains were prepared and their primary fibers were prepared.The chemical structure and surface properties of the fibers were characterized by means of FTIR, contact angle and so on. The interfacial shear strength between DHPBO fiber and epoxy matrix was investigated by SEM and the effects of hydroxyl group introduction on fiber compression and UV resistance were evaluated by axial compression bending test and UV accelerated aging test. The introduction of hydroxyl groups makes DHPBO fiber surface hydrophilicity, interfacial shear strength with epoxy resin and fiber compression performance and UV resistance have been significantly improved.