以2,5-二羟基对苯二甲酸(DHTA)为改性单体,采用化学共聚改性的方法,合成了大分子链上含有羟基基团的聚对苯撑苯并二噁唑(PBO)与DHTA的共聚物(DHPBO),并通过液晶纺丝技术得到了DHPBO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,并通过微脱粘实验和SEM评价了DHPBO纤维与环氧树脂基体的界面剪切强度.结果表明:50mol% DHTA的加入使水在PBO纤维表面的接触角由71.4°减小到50.7°,乙醇在PBO纤维表面的接触角由37.2°减小到27.4°;当DHTA含量为20 mol%时,DHPBO 纤维的表面自由能增加到43.96 mJ/m2,比PBO纤维提高了23.83%.当DHTA含量为10 mol%时,DHPBO纤维与环氧树脂的界面剪切强度为18.87 MPa,比PBO纤维与环氧树脂的界面剪切强度提高了92.55%.
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