环氧氯丙烷修饰的对位和间位芳纶涂覆剂研究

制备了具有环氧丙基侧链的对位芳纶(PPTA-ECH)和间位芳纶(PMIA-ECH),并将其用做对位芳纶(PPTA)织物/环氧树脂复合材料中PPTA织物的涂覆剂。采用场发射扫描电子显微镜(FE-SEM)及XPS等方法对PPTA织物表面的PPTA-ECH涂层结构进行了表征。考察了PPTA-ECH和PMIA-ECH涂覆的PPTA织物/环氧树脂复合材料的层间剪切强度和面内剪切强度,并与未经涂覆的PPTA织物复合材料的性能作比较。结果表明,PPTA-ECH和PMIA-ECH可显著改善PPTA织物和环氧树脂之间的界面性能。涂覆了PPTA-ECH及PMIA-ECH的PPTA织物/环氧树脂复合材料的层间剪切强度(ILSS)比未经涂覆的复合材料分别提高了26.20%和14.76%,面内剪切强度(ISS)分别提高了26.98%和11.86%。由于PPTA-ECH对PPTA纤维具有更强的亲和能力,因此PPTA-ECH在层间剪切强度和面内剪切强度方面的增强效果均优于PMIA-ECH。对PPTA-ECH在PPTA纤维表面铺展与吸附及对复合材料的增强机理也进行了初步探讨。作为新型涂覆剂,PPTA-ECH在对位芳纶复合材料的开发应用方面具有潜在的应用前景。

Modified Ploy(p-phenylene terephthalamide) and Poly (m-phenylene isophthalamide) with Epichlorohydrin as Coating Agent

Epichlorohydrin modified poly (p-phenylene terephthamide) (PPTA-ECH) and poly (m-phenylene isophthalamide) (PMIA-ECH) were prepared and used as coating agents for PPTA fabric in PPTA fabric/epoxy resin composites.Field emission scanning electron microscopy (FE-SEM),Fourier Transform Infrared Spectroscopy (FTIR),and x-ray photoelectron spectroscopy (XPS) were used to characterize the structure of PPTA-ECH coating on the surface of PPTA fibers.The interlaminar shear strength (ILSS) and in-plane shear strength (ISS) of composites of PPTA-ECH and PMIA-ECH coated PPTA fabric/epoxy resins were investigated,which were compared with that of the pristine PPTA fabric/epoxy resin.The results showed that the coatings of PPTA-ECH and PMIA-ECH can significantly improve the interfacial properties of PPTA fabric with epoxy resins.The ILSS values of PPTA-ECH and PMIA-ECH coated PPTA fabric/epoxy resin composites were increased by 26.20％ and 14.76％,and the ISS values of them were increased by 26.98％ and 11.86％,respectively,compared with that of pristine PPTA fabric/epoxy resin.The reinforcement effects of PPTA-ECH on ILSS and ISS are better than those of PMIA-ECH due to the stronger affinity of the former for PPTA fiber.The spreading and adsorption of PPTA-ECH on the surface of PPTA fibers and its reinforcement mechanism for PPTA fabric/epoxy resin composite were discussed.Thus PPTA-ECH has great potential as new coating agent for the fabrication of PPTA materials.