High-temperature vapor deposition polymerization polyimide coating for elimination of surface nano-flaws in high-strength carbon fiber
High-temperature vapor deposition polymerization polyimide coating for elimination of surface nano-flaws in high-strength carbon fiber
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DOI：
10.1016/j.carbon.2011.05.026
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发表时间：
2011-10-01
期刊：
影响因子：
10.9
通讯作者：
Yang, Jenn-Ming
中科院分区：
文献类型：
--
作者：
Naganuma, Tamaki;Naito, Kimiyoshi;Yang, Jenn-Ming
采用浸渍法和高温气相沉积聚合法（VDP）对高强度聚丙烯腈基碳纤维进行了聚酰亚胺涂层处理，研究了聚酰亚胺涂层对碳纤维单丝拉伸强度的影响。与冷基材上的VDP不同，高温VDP具有在加热至200摄氏度的基材上由二胺和二氢化物单体直接合成并各向同性存款聚酰亚胺的潜力，而没有任何副产物。所有聚酰亚胺涂层的使用，提高的平均长丝拉伸强度的温度敏感的碳纤维。然而，对于相同的单体，高温VDP涂层工艺是有利于高效的表面裂纹愈合相比，浸涂工艺，导致在25%的碳纤维的平均拉伸强度的增加。这些结果不仅对于没有人工纳米切口的碳纤维是明显的，而且对于具有深度小于30 nm的人工切口的碳纤维也是明显的。因此，我们清楚地表明了VDP聚酰亚胺涂层修复碳纤维表面纳米缺陷的潜力。表征了涂层在纳米切口中的不同渗透及其对长丝拉伸性能的影响，并讨论了涂层与纤维之间具有夹层的VDP涂层的影响。(C)2011爱思唯尔有限公司版权所有。
The effect of polyimide coatings on the filament tensile strength of high-strength polyacrylonitrile-based carbon fiber was studied by using dip and high-temperature vapor deposition polymerization (VDP) coating processes. Unlike a VDP on a cold substrate, high-temperature VDP has the potential to directly synthesize and isotropically deposit a polyimide, from diamine and dihydride monomers without any by-products, on a substrate heated up to 200 degrees C. The average filament tensile strength of the flaw-sensitive carbon fiber improved with all the polyimide coatings used. Nevertheless, for the same monomers, the high-temperature VDP coating process was advantageous for high-efficiency surface flaw healing compared to the dip-coating process, resulting in a 25% increase in the average tensile strength of the carbon fiber. These results were evident not only for the carbon fibers without artificial nano-notches but also for those with artificial notches less than 30 nm in depth. Thus, we clearly showed the potential for the VDP polyimide coating to heal surface nano-flaws of the carbon fiber. The different infiltrations of the coating into nano-notches and its effect on the filament tensile properties were characterized, as well as discussing the impact of the VDP coating with an interlayer between the coating and the fiber. (C) 2011 Elsevier Ltd. All rights reserved.