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碱处理对加捻竹纤维/环氧复合材料润湿性与拉伸失效的影响

顾少华 李昊远 张文福 王翠翠 李明鹏 程海涛 王戈

顾少华, 李昊远, 张文福, 等. 碱处理对加捻竹纤维/环氧复合材料润湿性与拉伸失效的影响[J]. 复合材料学报, 2024, 41(4): 1870-1878. doi: 10.13801/j.cnki.fhclxb.20230904.002
引用本文: 顾少华, 李昊远, 张文福, 等. 碱处理对加捻竹纤维/环氧复合材料润湿性与拉伸失效的影响[J]. 复合材料学报, 2024, 41(4): 1870-1878. doi: 10.13801/j.cnki.fhclxb.20230904.002
GU Shaohua, LI Haoyuan, ZHANG Wenfu, et al. Effect of alkali treatment on the wettability and tensile failure of twisted bamboo fiber/epoxy composites[J]. Acta Materiae Compositae Sinica, 2024, 41(4): 1870-1878. doi: 10.13801/j.cnki.fhclxb.20230904.002
Citation: GU Shaohua, LI Haoyuan, ZHANG Wenfu, et al. Effect of alkali treatment on the wettability and tensile failure of twisted bamboo fiber/epoxy composites[J]. Acta Materiae Compositae Sinica, 2024, 41(4): 1870-1878. doi: 10.13801/j.cnki.fhclxb.20230904.002

碱处理对加捻竹纤维/环氧复合材料润湿性与拉伸失效的影响

doi: 10.13801/j.cnki.fhclxb.20230904.002
基金项目: 国家自然科学基金(32371979);国家重点研发计划(2022YFD2200903)
详细信息
    通讯作者:

    程海涛,博士,研究员,博士生导师,研究方向为竹纤维复合材料 E-mail: htcheng@icbr.ac.cn

  • 中图分类号: TB332

Effect of alkali treatment on the wettability and tensile failure of twisted bamboo fiber/epoxy composites

Funds: National Natural Science Foundation of China (32371979); National Key R&D Program of China (2022YFD2200903)
  • 摘要: 采用加捻竹纤维(TBF)为增强相、环氧树脂-酸酐体系为基体相,制备加捻竹纤维/环氧树脂(TBF/EP)复合材料,通过改变NaOH溶液浓度(1wt%~5wt%),研究碱处理对TBF/EP复合材料润湿性和拉伸失效的影响。采用SEM、表面张力测试、原位加载等纳米和微观试验手段,对纤维-树脂结合状态、润湿性能和拉伸力学特性进行了分析。结果表明:碱处理降低了纤维表面能和极性,使TBF与基体润湿力从0.45 mN降至0.1 mN;3wt%NaOH溶液改性的TBF/EP复合材料含胶量降低至62%,拉伸强度(TS)达到273.70 MPa,比未处理复合材料提高178.64%;原位分析显示,TBF失效过程包括纤维断裂和纤维间滑移,而TBF/EP复合材料失效过程包括基体剪切屈服和纤维断裂,且随着浸润性提高,BF抑制屈服的效果增加。因此,TBF/EP复合材料的强度主要来源于纤维和界面的增强,受TBF与基体的浸润性、应力传递效果的影响。

     

  • 图  1  加捻竹纤维(TBF)的制备过程:(a) 竹材;(b) 竹条;(c) 竹纤维束;(d) 竹纤维(BF);(e) 加捻设备;(f) TBF;(g) TBF的SEM图像;(h) TBF制备示意图

    Figure  1.  Preparation process of twisted bamboo fiber (TBF): (a) Bamboo; (b) Bamboo strips; (c) Bamboo fiber bundles; (d) Bamboo fiber (BF); (e) Equipment of twisting; (f) TBF; (g) SEM image of TBF; (h) Schematic diagram of preparation of TBF

    图  2  TBF/环氧树脂(EP)复合材料的制备工艺

    Figure  2.  Preparation process of TBF/epoxy resin (EP) composite

    MeTHPA—Methyl tetrahydrophthalic anhydride

    图  3  TBF的润湿性测试模型

    Figure  3.  Wettability test model of TBF

    θF1, θF2, θF3, θF4, θF5—Different infiltration angles of the bamboo fiber units of TBF

    图  4  TBF的SEM图像:((a)~(c)) TBF;(d) 1wt%-TBF;(e) 2wt%-TBF;(f) 3wt%-TBF;((g)~(i)) 5wt%-TBF (NaOH溶液浓度:1wt%、2wt%、3wt%、5wt%)

    Figure  4.  SEM images of TBF: ((a)-(c)) TBF; (d) 1wt%-TBF; (e) 2wt%-TBF; (f) 3wt%-TBF; ((g)-(i)) 5wt%-TBF (NaOH solution concentrations: 1wt%, 2wt%, 3wt%, 5wt%)

    图  5  TBF/EP复合材料形态分析:((a)~(c)) 表面形态;((d)~(f)) 横截面;((g)~(i)) 横截面的黑白二值图

    Figure  5.  Morphological analysis of TBF/EP composites: ((a)-(c)) Surface morphology; ((d)-(f)) Cross section; ((g)-(i)) Black and white binary graph of cross section

    图  6  TBF的直径和含胶量

    Figure  6.  Diameter and resin amount of TBF

    图  7  (a) TBF在正己烷下的润湿力;(b) BF和TBF的表面能

    Figure  7.  (a) Wetting force of TBF under the n-hexane; (b) Surface energy of BF and TBF

    ΔSE—Difference of surface energy between BF and TBF; FF, θF—Balance force and contact angle during falling; FR, θR—Balance force and contact angle during rising

    图  8  TBF在EP基体中的动态润湿力

    Figure  8.  Dynamic wetting force of TBF under the EP matrix

    图  9  TBF的原位拉伸失效分析:((a), (b)) 拉伸力学;((c)~(f)) 0.05、0.10、0.20、0.22 mm时TBF拉伸形貌

    Figure  9.  In-situ tensile failure analysis of TBF: ((a), (b)) Tensile mechanics; ((c)-(f)) Tensile morphologies of TBF at 0.05, 0.10, 0.20 and 0.22 mm

    图  10  TBF/EP复合材料原位拉伸失效分析:((a), (b)) 拉伸强度;((c)~(f)) 0.05、0.10、0.24、0.25 mm时3wt%-TBF/EP复合材料拉伸形貌

    Figure  10.  In-situ tensile failure analysis of TBF/EP composite: ((a), (b) ) Tensile strength; ((c)-(f)) Tensile morphologies of 3wt%-TBF/EP composite at 0.05, 0.10, 0.24 and 0.25 mm

    表  1  TBF的基本性质

    Table  1.   Basic properties of TBF

    BFLength/cmWidth/mmThickness/mmStrength/MPa
    100.36-0.70.13-0.2180±16
    TBFDiameter/mmTensile/NLinear density/(g·m−1)Twist angle/(°)
    1.28±0.1248.81264
    下载: 导出CSV

    表  2  加捻竹纤维的接触角和表面能

    Table  2.   Contact angle and surface energy of TBF

    IndexWetting boundary/mmAdvancing contact angle/(°)Owens-Wendt worth/mNSurface energy/mN
    WaterEthylene glycolDiiodomethaneDispersionPolar
    0wt%21.9461.7548.5640.4822.4910.2332.72
    1wt%11.4661.6741.9644.3422.73 8.5131.24
    2wt%12.8661.9146.1247.1923.72 7.5831.30
    3wt%10.4264.7645.7054.5821.00 7.0928.08
    5wt%11.2669.9147.3059.0122.03 4.2126.23
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-07-05
  • 修回日期:  2023-08-11
  • 录用日期:  2023-08-20
  • 网络出版日期:  2023-09-06
  • 刊出日期:  2024-04-15

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