碳纤维<strong>/</strong>环氧复合材料界面改性的不均匀性

doi:10.11901/1005.3093.2022.352

材料研究学报

2023, Vol. 37

Issue (9): 668-674 DOI: 10.11901/1005.3093.2022.352

研究论文

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碳纤维/环氧复合材料界面改性的不均匀性

王乾¹, 蒲磊¹, 贾彩霞¹(

), 李志歆², 李俊¹

^1.沈阳航空航天大学航空宇航学院沈阳 110136
^2.中国南方航空股份有限公司沈阳维修基地沈阳 110169

Inhomogeneity of Interface Modification of Carbon Fiber/Epoxy Composites

WANG Qian¹, PU Lei¹, JIA Caixia¹(

), LI Zhixin², LI Jun¹

^1.College of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China
^2.Shenyang Aircraft Maintenance & Overhaul Base, China Southern Airlines Company Limited, Shenyang 110169, China

引用本文:

王乾, 蒲磊, 贾彩霞, 李志歆, 李俊. 碳纤维/环氧复合材料界面改性的不均匀性[J]. 材料研究学报, 2023, 37(9): 668-674.
Qian WANG, Lei PU, Caixia JIA, Zhixin LI, Jun LI. Inhomogeneity of Interface Modification of Carbon Fiber/Epoxy Composites[J]. Chinese Journal of Materials Research, 2023, 37(9): 668-674.

全文: PDF(6484 KB) HTML

摘要:

研究了等离子体表面改性和等离子体接枝改性碳纤维/环氧树脂基复合材料界面的不均匀性。层间剪切强度(ILSS)测量及其偏差评估的结果表明，在相同等离子体条件下，等离子体表面改性对ILSS的提升率只有8.6%，而等离子体接枝改性的提升率高达37%；但是，接枝改性ILSS的离散程度比较高。扫描电镜、金相显微镜和红外光谱分析的结果进一步表明，接枝改性可通过取代反应将较多的活性基团键接在碳纤维表面从而更容易实现界面提升，但是接枝层的不均匀及其产生的纤维粘连使ILSS的离散程度提高。

关键词 ：材料表面与界面, 不均匀性, 等离子体改性, 离散程度

Abstract：

The effect of plasma surface modification and plasma grafting modification on the inhomogeneity of interfacial properties of the modified carbon fiber/epoxy composites was comparatively studied by means of interlaminar shear strength (ILSS) test, metallography, SEM, attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIS) in terms of the relevant affecting factors. Firstly, the interlaminar shear strength (ILSS) of the composites was measured and its variation was evaluated.Results showed that the enhancement rate of ILSS by plasma surface modification was only 8.6%, while that by plasma grafting was 37% by the same plasma treatment conditions. However, compared with the plasma surface modification, the plasma graft modification aggravated the dispersion of ILSS. Then the surface morphology and the adhesion situation to the resin matrix of the carbon fibers modified by the two methods were studied by scanning electron microscope and metallographic microscope, respectively. Fourier transform infrared spectroscopy was used to reveal the chemical reactions on the fiber surface. The results showed that compared with the plasma surface modification, the plasma grafting modification could graft more active groups onto carbon fibers through substitution reaction, which may result in the improvement of interfacial properties. However, due to the inhomogeneity of grafting layer, which may cause the increase of the fiber adhesion and aggregation, thereby the ILSS dispersion of composites after grafting modification was expanded. Therefore, the control of plasma grafting modification on the homogeneity of interfacial property for composites deserves more attention. This study can provide some theoretical guidance for composite interface modification and its homogeneitycontrol.

Key words： surface and interface in the materials degree of dispersion plasma modification inhomogeneity

收稿日期: 2022-06-28

ZTFLH:

TB332

基金资助:中国学位与研究生教育学会重点项目(2020ZDB80);辽宁省教育厅科学研究项目(JYT2020012&JYT2020014)

通讯作者: 贾彩霞，副教授，jiacaixia@sau.edu.cn，研究方向为航空复合材料制造及维修技术

Corresponding author: JIA Caixia, Tel: (024)89723720, E-mail: jiacaixia@sau.edu.cn

作者简介: 王乾，男，1985年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.352 或 https://www.cjmr.org/CN/Y2023/V37/I9/668

图1 碳纤维改性及其复合材料的制备过程

表1 碳纤维及碳纤维/环氧树脂复合材料试样编号

表2 不同等离子体处理的复合材料的层间剪切强度

图2 不同接枝浓度改性后ILSS及其偏差的变化

图3 不同处理前后碳纤维的SEM照片

图4 不同改性前后复合材料的金相照片

图5 表面和接枝改性前后碳纤维表面的红外光谱

图6 不同接枝浓度碳纤维的红外光谱

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