【摘要】 PBO作为增强纤维存在与环氧树脂基体界面粘结性能差的问题。通过在聚合过程中添加少量5-磺酸钠-间苯二甲酸部分替代对苯二甲酸与4,6-二氨基间苯二酚盐酸盐进行共聚,合成了大分子链上含有离子基团的SPBO共聚物,并制得SPBO初生纤维。通过接触角测试和XPS研究了纤维的表面性能,通过微脱粘实验和SEM评价了纤维与环氧树脂基体的界面粘结性能。结果表明:与PBO纤维相比,SPBO纤维表面浸润性能提高,表面含氮、氧量均增加,与环氧树脂的界面剪切强度从8.2 MPa提高到10.1 MPa,提高了23%。更多还原

【Abstract】 The modified poly（p-phenylene benzoxazole）（PBO） containing ionic groups in polymer chains（sulfonated poly p-phenylene benzoxazole,SPBO） was obtained by copolymerization from 1,3-diamino-4,6-dihydroxybenzenedihydrochloride（DAR） and terephthalic acid（TPA）,with addition of certain amounts of 5-sulfoisophthalic acid monosodium salt in replace of TPA,in polyphosphoric acid.The SPBO fiber was obtained for the first time through a dry-jet wet-spinning technique.After incorporation of ionic groups into PBO macromolecular chains,the wetting properties of PBO fiber are improved.The contact angles of water and ethanol on PBO fiber surface decrease from 71.4° and 37.2° to 66.3° and 30.6° respectively.And the surface free energy of SPBO fiber increases to(38.9 mJ·m^-2),which is 9.6% higher than that of PBO fiber.XPS analysis shows that the surface nitrogen-to-（carbon） ratio is increased from 0.0157 to 0.0471 and oxygen-to-carbon ratio is increased from 0.2331 to 0.3070,and the ionization energy（or binding energy） of C_1s and O_1sdecreases.The interfacial shear strength（IFSS） was determined by the microbond pull out test.The introduction of ionic groups leads to a 23% increase in IFSS from（8.2MPa） for PBO/epoxy to 10.1MPa for SPBO/epoxy.In addition,the surface morphology of the pull-outed PBO and SPBO fibers was observed by scanning electron microscopy.It is found that the failure mode changed from（fiber/matrix） interface adhesive failure to partly cohesive failure mode.更多还原