张晶威,董杰,滕翠青
ZHANG Jing-wei,DONG Jie,TENG Cui-qing

• 1:纤维改性国家重点实验室东华大学材料科学与工程学院

摘要(Abstract)：

利用L-3,4-二羟基苯丙氨酸(L-DOPA)的氧化自聚合,在杂环芳纶表面修饰聚L-3,4-二羟基苯丙氨酸(PDOPA)活性涂层来提高芳纶的表面活性及耐紫外辐照性能。结果表明:改性后芳纶表面粗糙度显著提高,同时,PDOPA涂层上大量的羧基、羟基等活性单元均有利于增强与环氧树脂的机械锁合力,改性后芳纶/环氧树脂复合材料的界面剪切强度提高了32.0%。此外,上述改性过程对杂环芳纶本身力学性能影响较小,纤维的拉伸强度保持率可以达到100%,基本实现了无损改性。同时,由于PDOPA的保护作用,改性后芳纶的耐紫外辐射性能显著提高;经过168 h紫外线辐照处理后,其拉伸强度保持率可达到92.5%,显著提升了杂环芳纶的耐紫外线辐照特性。
The surface of the heterocyclic aramid fibers was coated with L-3,4-dihydroxyphenylalanine(LDOPA), which could be oxidized and self-polymerized to poly L-3,4-dihydroxyphenylalanine(PDOPA) to improve the surface activity and UV-resistance of aramid fibers. The microstructure, chemical properties of modified fibers and interfacial properties to the epoxy resin were investigated by scanning electron microscopy, X-ray photoelectron spectroscopy and microsphere debonding experiments. As a result, the surface roughness of the modified aramid fibers is significantly improved and achieved a strong mechanical interlock with the polymer matrix. The interfacial shear strength of modified aramid fibers/epoxy composites increases by 32.0% and the tensile strength retention rate of the modified aramid can reach 100%. The above modification process has little effect on the thermal stability and mechanical properties of aramid fibers, indicating it is a non-destructive modification method. Under the protection of PDOPA, the modified fibers possess excellent UV radiation resistance. The tensile strength retention rate of modified fibers reaches92.5% after 168 h of UV irradiation.

关键词(KeyWords)： 芳纶;L-3,4-二羟基苯丙氨酸;界面性能;耐紫外线辐照性能
aramid fiber;L-3,4-dihydroxyphenylalanine;interfacial property;UV-resistance

Abstract:

Keywords:

基金项目(Foundation): 中国纺织工业联合会应用基础研究项目(J201803)

作者(Author): 张晶威,董杰,滕翠青
ZHANG Jing-wei,DONG Jie,TENG Cui-qing

DOI: 10.16090/j.cnki.hcxw.2020.04.009

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