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首页> 外文期刊>Journal of Applied Polymer Science >Surface modification of polyimide fibers by novel alkaline-solvent hydrolysis to form high-performance fiber-reinforced composites
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Surface modification of polyimide fibers by novel alkaline-solvent hydrolysis to form high-performance fiber-reinforced composites

机译：新型碱性溶剂水解的聚酰亚胺纤维的表面改性，形成高性能纤维增强复合材料

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摘要

We modified polyimide (PI) fibers by a novel hydrolysis approach and fabricated PI-fiber-reinforced novolac resin (NR) composites with enhanced mechanical properties. We first used an alkaline-solvent mixture containing potassium hydroxide liquor and dimethylacetamide (DMAc) for the surface modification of the PI fibers. The results indicate that the surface roughness and structure of the PI fibers were controlled by the hydrolysis time and the content of DMAc. With the optimized hydrolysis conditions, the tensile modulus of modified PI fibers improved 15% without compromises in the fracture stress, fracture strain, or thermal stability. The interfacial shear strength between the modified PI fibers and NR increased 57%; this indicated a highly enhanced interfacial adhesion. Finally, the tensile and flexural strengths of the composites increased 72 and 53%, respectively. This research provides an effective method for the surface modification of PI fibers and expands their applications for high-performance composites. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46595.
机译：我们通过新型水解方法改性聚酰亚胺（PI）纤维，并制造了具有增强的机械性能的PI纤维增强酚醛清漆树脂（NR）复合材料。我们首先使用含有氢氧化钾液和二甲基乙酰胺（DMAC）的碱性溶剂混合物，用于PI纤维的表面改性。结果表明，PI纤维的表面粗糙度和结构由水解时间和DMAC的含量控制。利用优化的水解条件，改性PI纤维的拉伸模量在断裂应力，断裂应变或热稳定性中提高了15％而不会折衷。改性PI纤维和NR之间的界面剪切强度增加了57％;这表明了高度增强的界面粘附。最后，复合材料的拉伸和弯曲强度分别增加了72％和53％。本研究提供了一种有效的PI纤维表面改性方法，并扩展其用于高性能复合材料的应用。 （c）2018 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,46595。

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