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热氧老化对纬编双轴向多层衬纱织物增强复合材料力学性能的影响

杨晨 姜亚明 项赫 李佳楠

杨晨, 姜亚明, 项赫, 等. 热氧老化对纬编双轴向多层衬纱织物增强复合材料力学性能的影响[J]. 复合材料学报, 2022, 40(0): 1-13
引用本文: 杨晨, 姜亚明, 项赫, 等. 热氧老化对纬编双轴向多层衬纱织物增强复合材料力学性能的影响[J]. 复合材料学报, 2022, 40(0): 1-13
Chen YANG, Yaming JIANG, He XIANG, Jianan LI. Effect of thermo-oxidative aging on the mechanical properties of multi-layered biaxial weft knitted fabric reinforced composites[J]. Acta Materiae Compositae Sinica.
Citation: Chen YANG, Yaming JIANG, He XIANG, Jianan LI. Effect of thermo-oxidative aging on the mechanical properties of multi-layered biaxial weft knitted fabric reinforced composites[J]. Acta Materiae Compositae Sinica.

热氧老化对纬编双轴向多层衬纱织物增强复合材料力学性能的影响

基金项目: 航空科学基金项目(201829Q2002);天津市自然科学基金重点项目(18JCZDJC10020);中国国家留学基金项目(202008120134)
详细信息
    通讯作者:

    姜亚明,博士,教授,博士生导师,研究方向为先进纺织增强材料及其复合材料 E-mail: jiangyaming@tiangong.edu.cn

  • 中图分类号: TB332

Effect of thermo-oxidative aging on the mechanical properties of multi-layered biaxial weft knitted fabric reinforced composites

  • 摘要: 通过改变预制体结构衬纱取向的方法制备了几种含不同剪切角的纬编双轴向多层衬纱(Multilayered biaxial weft knitted, MBWK)织物增强复合材料。基于Arrhenius模型和Ozawa法设计了热氧老化试验,采用力学性能测试、DSC、FTIR和DMA测试对老化前后的试样热-物理性能进行了表征。实验结果表明:预制体的纱线剪切角不同,其复合材料受热氧老化后力学性能的保留率也显著不同,由于乙烯基酯树脂在热氧老化环境中会发生后固化现象,因此复合材料的弯曲模量在老化过程中呈现先增加后下降的趋势,而拉伸性能则受到增强体结构的影响,纤维/基体界面的结合力退化使得拉伸模量在老化过程中持续下降;随着老化时间的延长,树脂的固化度逐渐增加,玻璃化转变温度Tg逐渐升高,储能模量峰值在老化初期由于分子链交联上升,老化后期分子链断裂占据主导作用致使峰值逐渐下降。

     

  • 图  1  纬编双轴向多层衬纱(MBWK)织物

    Figure  1.  Multilayered biaxial weft knitted (MBWK) fabric

    图  2  复合成型工艺

    Figure  2.  Composite forming process

    图  3  预制体剪切角控制流程

    Figure  3.  Control flow of preform shear Angle

    图  4  不同剪切角的MBWK复合材料试样

    Figure  4.  MBWK composite samples with different shear angles

    图  5  VER温度-失重率曲线

    Figure  5.  Temperature-mass loss curves of VER

    图  6  100℃热氧环境下VER表面氧化层红外光谱图

    Figure  6.  Infrared spectra of oxide layer on VER at 100℃

    图  7  不同老化时间VER红外光谱局部图

    Figure  7.  Partial infrared spectra of VER at different aging time

    图  8  VER浇铸体热氧老化后的玻璃化温度Tg和损耗因子tanδ峰值

    Figure  8.  Peak values of glass transition temperature Tg and loss factor tanδ before and after aging of the VER casting body

    图  9  VER浇铸体热氧老化后储存模量变化趋势

    Figure  9.  Changing trend of storage modulus of VER casting body after thermo-oxidative aging

    图  10  VER浇铸体老化前后的拉伸性能

    Figure  10.  Tensile properties before and after aging of the VER casting body

    图  11  Z组MBWK复合材料试样老化前后的拉伸性能

    Figure  11.  Tensile properties before and after aging of the Z series sample of MBWK composites

    图  12  N组MBWK复合材料试样老化前后的拉伸性能

    Figure  12.  Tensile properties before and after aging of the N series sample of MBWK composites

    图  13  VER浇铸体老化前后的弯曲性能

    Figure  13.  Flexural properties change before and after aging of the VER casting body

    图  14  Z组MBWK复合材料试样老化前后的弯曲性能

    Figure  14.  Flexural properties before and after aging of the Z series sample of MBWK composites

    图  15  N组MBWK复合材料试样老化前后的弯曲性能

    Figure  15.  Flexural properties before and after aging of the N series sample of MBWK composites

    表  1  MBWK织物参数

    Table  1.   MBWK fabrics parameters

    TypeParameter
    Weft inserting yarnsKevlar-494740dtex(1580dtex×3)
    Warp inserting yarnsKevlar-499480dtex(1580dtex×6)
    Stitching yarnsPolyester166.7dtex(83.3dtex×2)
    Layer structure90°/0°/90°
    Warp density/(tows·inch-1)12
    Weft density(tows·inch-1)12
    Thickness/mm1.5
    下载: 导出CSV

    表  2  RIPOXY R-806 乙烯基酯树脂(VER)成品性能指标

    Table  2.   RIPOXY R-806 vinyl ester resin (VER) finished product performance indicators

    ParameterValue
    Tensile strength/MPa69-89
    Tensile modulus/GPa2.9-3.3
    Tensile elongation at break/%3.2-4.0
    Flexural strength/MPa120-150
    Flexural modulus/GPa2.9-3.3
    Distortion temperature/℃108-118
    Barcol hardness40
    Volume shrinkage/%7.5-8.5
    下载: 导出CSV

    表  3  VER浇铸体活化能计算数据

    Table  3.   Calculation data of activation energy of the VER casting body

    Mass loss ratioSlopeActivation energy/eVAverage valueDeviation/%
    0.9−4315.240.83150.80293.56
    0.85−4238.740.79410.8
    0.8−4227.990.78321.97
    下载: 导出CSV

    表  4  MBWK复合材料和VER浇铸体的热氧老化实验时间与自然老化时间对应关系

    Table  4.   Relationship between the thermo-oxidative aging experimental time and the natural aging time of the MBWK composite and VER casting body

    Temperature/
    Thermo-oxidative
    aging/h
    Natural aging
    time/M
    100 0.5 1
    3.5 7
    6.5 13
    10 20
    13.5 27
    18 36
    下载: 导出CSV

    表  5  VER液态体系DSC测试结果

    Table  5.   DSC test results of VER liquid system

    Heating rate/(℃·min−1)Initial temperature/℃Peak temperature/℃Final temperature/℃Total enthalpy of reaction/(J·g−1)
    283.688.993.0266.1
    589.398.6113.6235.1
    10125.1138.4155.5279.5
    12149.9164.1173.9249.9
    15155.5172.8185.3256.6
    下载: 导出CSV

    表  6  VER浇铸体热氧老化后DSC测试结果

    Table  6.   DSC test results of the VER casting body after thermo-oxidative aging

    Aging time/hHeating rate/
    (℃·min−1)
    Initial
    temperature/℃
    Peak
    temperature/℃
    Final
    temperature/℃
    Heat enthalpy/
    (J·g−1)
    Degree of
    cure/%
    0561.480.5132.673.2771.54
    0.5576.593.9131.337.7785.33
    3.55128.9135.3148.711.4695.55
    6.55129.7137.1150.811.495.57
    105111.4120.3134.911.3195.6
    13.55119.4137.6146.44.07898.42
    185123.1136.1150.33.63598.6
    下载: 导出CSV
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  • 收稿日期:  2021-12-28
  • 录用日期:  2022-02-11
  • 修回日期:  2022-02-05
  • 网络出版日期:  2022-03-09

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