Tensile and interfacial properties of polyacrylonitrile-based carbon fiber after different cryogenic treated condition
注意：本论文已在 Composites Part B 99 (2016) 358-365 发表
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Yinnan Zhang a, b, Fujun Xu a, b, *, Chuyang Zhang b, c, Junjie Wang d, Zhemin Jia e,
David Hui f, Yiping Qiu a, b, **
a Key Laboratory of Textile Science & Technology, Ministry of Education (Donghua University), Shanghai 201620, PR China
b College of Textiles, Donghua University, Shanghai 201620, PR China
c College of Textiles and Apparels, Xinjiang University, Urumqi, Xinjiang Uyghur Autonomous Region 830046, PR China
d Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
e School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, PR China
f Department of Mechanical Engineering, University of New Orleans, New Orleans, LA 70148, USA
Abstract
Polyacrylonitrile-based carbon fibers are cryogenically conditioned both through a low cooling rate and a quench rate to explore the effects of cryogenic treatments on properties and micro-structures of carbon fibers. The internal structure, tensile properties and surface morphologies of the fiber are investigated.Increase in crystallinity and tighter packing of molecules of the fiber after the cryogenic treatments are observed regardless the cooling rate. After slow cooling cryogenic treatment, the inter-planar distance increases in the fiber axial direction and decreases in the fiber radial direction, resulting in 3% shrinkage of fiber diameter and extension in fiber axial direction. Scanning electron microscopy and atomic force microscopy analysis show slightly wider and deeper rill-like folds and 41% roughness increase for the fiber surfaces, leading to an increase in interfacial shear strength between the fiber and epoxy by 30.2%. In contrast, after sharp cooling cryogenic treatment, no obvious change is detected in inter-planar distance,fiber diameter, surface morphology and interfacial shear strength with epoxy. The bimodal additive Weibull distributions of tensile strengths for the cryogenic treated fibers show an increase of the bimodality parameter a and a decrease in scale parameter s indicating higher probability of extrinsicdefects but no significant mechanical degradation of the fiber after cryogenic treatments.
Keywords: Carbon fibers;Fibre/matrix bond;Mechanical testing;Surface analysis
摘要：对聚丙烯腈基碳纤维进行了低冷却速率和淬火速率的低温处理，以探讨低温处理对碳纤维性能和微观结构的影响。
研究了纤维的内部结构、拉伸性能和表面形貌，发现无论冷却速度如何，低温处理后纤维的结晶度增加，分子紧密堆积。
慢冷深冷处理后，纤维轴向的平面间距增大，径向的间距减小，导致纤维直径收缩3%，轴向伸长。
扫描电镜和原子力显微镜分析表明，纤维表面呈细沟状褶皱，粗糙度增加41%，纤维与环氧树脂的界面剪切强度提高了30.2%。
相反，经急冷深冷处理后，环氧树脂的晶面间距、纤维直径、表面形貌和界面剪切强度均未发生明显变化。
低温处理后纤维的拉伸强度呈双峰Weibull分布，双峰参数a增大，尺度参数s减小，表明深冷处理后纤维出现挤压缺陷的概率较高，但纤维的力学性能没有明显的退化。
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