聚氨酯上浆剂处理PBO纤维复合材料的界面性能
Interface properties of composites from PBO fibers modified by polyurethane sizing agent
蒋磊 1徐任信 1吴书广 2刘国权 3丁安心 1陈杨1
作者信息
- 1. 武汉理工大学 材料科学与工程学院,武汉 430070
- 2. 宜昌测试技术研究所,湖北 宜昌 443003
- 3. 河南省特种防护材料重点实验室,河南 洛阳 471023
- 折叠
摘要
为了提高聚对苯撑苯并二噁唑(poly-p-phenylenebenzobisoxazole,PBO)纤维/环氧树脂复合材料的界面性能,采用γ-氨丙基三乙氧基硅烷(KH550)改性水性聚氨酯得到上浆剂,然后对酸化后的PBO纤维进行表面涂覆处理.采用XPS和EDS分析PBO纤维表面的化学组成,利用SEM研究PBO纤维表面及其复合材料撕裂面的形貌,并对PBO纤维的单丝及复合材料的力学性能进行分析.结果表明:经过上浆剂包覆的PBO纤维表面活性基团明显增多,表面O/C(原子比)由0.16提升至0.25,上浆剂能有效修复纤维表面的缺陷;通过调控纤维表面上浆剂含量和结构,可使PBO纤维/环氧树脂单向复合材料的层间剪切强度提高到41.3 MPa,拉伸强度增加到1.70 GPa,相较于未处理的复合材料分别提高了44.9%和15.6%.
Abstract
To improve the interfacial properties of poly-p-phenylenebenzobisoxazole(PBO)fiber/epoxy resin(EP)composites,the surfaces of acidified PBO fibers were coated with the sizing agents of waterborne polyurethane modified using γ-aminopropyltriethoxysilane(KH550).The surface chemical composition of PBO fibers was characterized by X-ray photoelectron spectroscopy(XPS)and energy dispersive spectroscopy(EDS).Scanning electron microscopy(SEM)was employed to characterize the surface morphology of PBO fibers and the tear surface morphology of PBO/EP composites.Furthermore,the mechanical properties of single PBO fibers and PBO/EP composites were analyzed.The results show that the active groups on the surfaces of PBO fibers increase significantly with the values of O/C(atomic ratio)from 0.16 to 0.25 after being coated with the sizing agents,and the defects on the surfaces of PBO fibers can be repaired effectively.By adjusting the contents and structure of the sizing agents on the fibers,the interlaminar shear strength and tensile strength of PBO/EP unidirectional composites reach 41.3 MPa and 1.70 GPa,respectively.In contrast to the untreated ones,the interlaminar shear strength and tensile strength of modified composites increase by 44.9%and 15.6%,respectively.
关键词
PBO纤维/水性聚氨酯/上浆剂/界面性能/剪切强度Key words
PBO fiber/waterborne polyurethane/sizing agent/interface property/shear strength引用本文复制引用
基金项目
民用航天预先研究项目(D010505)
国家自然科学基金项目(21401145)
出版年
2024
国家科技期刊平台
NSTL
万方数据