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木粉/低熔点尼龙6复合材料的非等温结晶动力学

许世华 房轶群 王清文

许世华, 房轶群, 王清文. 木粉/低熔点尼龙6复合材料的非等温结晶动力学[J]. 复合材料学报, 2021, 38(7): 2218-2223. doi: 10.13801/j.cnki.fhclxb.20200902.002
引用本文: 许世华, 房轶群, 王清文. 木粉/低熔点尼龙6复合材料的非等温结晶动力学[J]. 复合材料学报, 2021, 38(7): 2218-2223. doi: 10.13801/j.cnki.fhclxb.20200902.002
XU Shihua, FANG Yiqun, WANG Qingwen. Non-isothermal crystallization kinetics of wood powder/low melting point polyamide 6 composites[J]. Acta Materiae Compositae Sinica, 2021, 38(7): 2218-2223. doi: 10.13801/j.cnki.fhclxb.20200902.002
Citation: XU Shihua, FANG Yiqun, WANG Qingwen. Non-isothermal crystallization kinetics of wood powder/low melting point polyamide 6 composites[J]. Acta Materiae Compositae Sinica, 2021, 38(7): 2218-2223. doi: 10.13801/j.cnki.fhclxb.20200902.002

木粉/低熔点尼龙6复合材料的非等温结晶动力学

doi: 10.13801/j.cnki.fhclxb.20200902.002
基金项目: 国家自然科学基金(31870547);十三五”国家重点研发计划项目(2019YFD1101203);五邑大学教学质量工程与教学改革工程(JX2019012;JX2019064;GDJX2019008);五邑大学博士科研启动项目(BSQD1902)
详细信息
    通讯作者:

    王清文,博士,教授,博士生导师,研究方向为木塑复合材料 E-mail:qwwang@scau.edu.cn

  • 中图分类号: TB332

Non-isothermal crystallization kinetics of wood powder/low melting point polyamide 6 composites

  • 摘要: 利用LiCl改性尼龙6 (PA6),并将其与木粉熔融共混制备了木粉/低熔点PA6复合材料,通过DSC法研究了木粉/低熔点PA6复合材料的非等温结晶动力学行为。结果表明,LiCl降低了PA6的熔点、结晶温度、结晶度和结晶速率,提高了PA6的结晶活化能。木粉是良好的成核剂,能够加快PA6的结晶速率,但却降低了其结晶度。通过Mo法分析木粉/低熔点PA6复合材料的非等温结晶动力学,结果表明,与纯PA6和木粉/PA6复合材料相比,低熔点PA6的F(T)值(表征聚合物结晶快慢参数)最大,LiCl提高了PA6在单位结晶时间内达到一定结晶度时所需的冷却速率,而木粉则与之相反。

     

  • 图  1  纯尼龙6 (PA6)、LPA6和木粉/LPA6复合材料在升/降温速率为10℃/min的DSC曲线

    Figure  1.  Heating and cooling DSC curves at 10℃/min of polyamide 6 (PA6), LPA6 and wood powder/LAP6 composites

    图  2  不同相对结晶度Xt的PA6、LPA6和W10/LPA6复合材料的lgR-lgt曲线

    Figure  2.  Curves of lgR-lgt of PA6, LPA6 and W10/LPA6 composite at different relative crystallinities Xt

    表  1  木粉/低熔点尼龙6 (LPA6)复合材料的组成

    Table  1.   Formulation of wood powder/low melting point polyamide 6 (LPA6) composites

    SampleLPA6/wt%Wood powder/wt%
    LPA6 100 0
    W10/LPA6 90 10
    W20/LPA6 80 20
    W30/LPA6 70 30
    下载: 导出CSV

    表  2  纯PA6、LPA6和木粉/LPA6复合材料的非等温结晶过程参数

    Table  2.   Parameters of non-isothermal crystallization process of pure PA6、LPA6 and wood powder/LAP6 composites

    SampleTm/℃To/℃Tp/℃t1/2/sXc/%
    PA6 221.81 185.99 176.20 54 21.43
    LPA6 199.27 160.80 151.85 68 13.64
    W10/LPA6 198.90 164.65 156.77 59 10.57
    W20/LPA6 199.08 166.60 158.96 58 10.01
    W30/LPA6 198.77 163.26 155.85 53 10.43
    Notes: Tm—Melting temperature; To—Initial crystallization temperature; Tp—Peak temperature of crystallization; t1/2—Half-time of crystallization; Xc—Crystallinity.
    下载: 导出CSV

    表  3  不同相对结晶度的PA6、LPA6和木粉/LPA6复合材料的非等温结晶动力学参数

    Table  3.   Non-isothermal crystallization kinetic parameters of PA6, LPA6 and wood powder/LPA6 composites at different relative crystallinities

    SampleXt/%αF(T)
    PA6 20 1.2522 4.3944
    40 1.3020 7.3706
    60 1.3196 10.4352
    80 1.3367 13.5863
    LPA6 20 1.4405 5.2024
    40 1.4088 9.6672
    60 1.3964 14.5512
    80 1.3613 21.9180
    W10/LPA6 20 1.4718 4.2924
    40 1.5326 7.4268
    60 1.4627 11.8222
    80 1.4170 18.1761
    W20/LPA6 20 1.5201 4.0973
    40 1.4478 7.7232
    60 1.4254 11.7598
    80 1.3978 17.6076
    W30/LPA6 20 1.7152 3.0953
    40 1.6408 6.2431
    60 1.6259 9.9632
    80 1.5400 15.8380
    Notes: Xt—Relative crystallinity; α—Ratio of Avrami to Ozawa’s exponent; F(T)—Cooling rate at unit crystallization.
    下载: 导出CSV

    表  4  PA6、LPA6和木粉/LPA6复合材料非等温结晶过程中的成核活性和结晶活化能

    Table  4.   Nucleation activity and crystallization activation energy in process of non-isothermal crystallization of PA6, LPA6 and wood powder/LPA6 composites

    SampleB or B*θΔE/(kJ·mol−1)
    PA6 7927 −138.73
    LPA6 6112 0.77 −76.80
    W10/LPA6 4276 0.54 −87.92
    W20/LPA6 3933 0.50 −101.23
    W30/LPA6 4798 0.61 −102.25
    Notes: B—Constant which is in state of homogeneous nucleation; B*—Constant which is in state of heterogeneous nucleation; θ—Nucleation activity; ΔE—Crystallization activation energy
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-07-09
  • 录用日期:  2020-08-20
  • 网络出版日期:  2020-09-03
  • 刊出日期:  2021-07-15

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