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热拉伸对三维编织聚乳酸复合材料性能的影响

王静 卢潇楠 吕东阳 焦亚男

王静, 卢潇楠, 吕东阳, 等. 热拉伸对三维编织聚乳酸复合材料性能的影响[J]. 复合材料学报, 2024, 42(0): 1-9.
引用本文: 王静, 卢潇楠, 吕东阳, 等. 热拉伸对三维编织聚乳酸复合材料性能的影响[J]. 复合材料学报, 2024, 42(0): 1-9.
WANG Jing, LU Xiaonan, LV Dongyang, et al. Effect of hot drawing on the properties of Three-dimensional braided polylactic acid composites[J]. Acta Materiae Compositae Sinica.
Citation: WANG Jing, LU Xiaonan, LV Dongyang, et al. Effect of hot drawing on the properties of Three-dimensional braided polylactic acid composites[J]. Acta Materiae Compositae Sinica.

热拉伸对三维编织聚乳酸复合材料性能的影响

详细信息
    通讯作者:

    王静,博士,副研究员,博士生导师,研究方向为先进纺织复合材料 E-mail: jingwang@tiangong.edu.cn

  • 中图分类号: TB332

Effect of hot drawing on the properties of Three-dimensional braided polylactic acid composites

  • 摘要: 三维编织热塑性复合材料有着更易回收,生产周期短的特点。其中,聚乳酸(polylactic acid, PLA)的生物相容性较好,且成本较低,得到广泛关注。热压成型(hot pressing, HP)工艺有着较高的设计自由度,然而,采取HP工艺制备三维编织聚乳酸复合材料因模具合模时对预制体挤压,可能会破坏编织结构,造成纤维的分布不匀,破坏界面性能,导致力学性能下降。热拉伸成型工艺(hot drawing, HD)作为一种自增强技术,在HP工艺的基础上于三维编织预制体的轴向施以拉伸力,可以有效提高PLA的结晶度和复合材料的力学性能。本实验分别采取HD和HP两种成型工艺制备玻璃纤维(glass fiber, GF)增强PLA复合材料并进行测试,发现:HD复合材料较HP复合材料的剪切强度高出了33.03%,弯曲强度高出了26.92%,拉伸强度高出了39.67%,结晶度提高了20.03%,并略微提升热稳定性。热拉伸工艺促进了PLA分子晶体沿轴向有序排列和晶核的生长,使得PLA分子链排列更加简单,提高了PLA的结晶度,同时提高了复合材料的力学性能。结合宏观以及3D轮廓观察,发现HD工艺改善了编织结构遭到破坏的问题,保证了三维编织花节的完整性,GF纤维束排列有序,利于复合材料整体性能的提升。

     

  • 图  1  PLA纤维的DSC曲线

    Figure  1.  DSC curve of PLA fibers

    图  2  热拉工艺成型模具

    Figure  2.  Hot-drawing process molding tooling

    图  3  热拉工艺流程曲线图

    Figure  3.  Hot drawing process flow curves

    图  4  热压工艺流程曲线图

    Figure  4.  Hot pressing process flow curves

    图  5  热拉伸成型工艺(HD)和热压成型(HP)复合材料的剪切载荷位移曲线对比

    Figure  5.  Comparison of shear load displacement curves for hot drawing (HD) and hot pressing (HP) composites

    图  6  HD和HP复合材料的剪切强度对比

    Figure  6.  Comparison of shear strength of HD and HP composites

    图  7  HD和HP复合材料的弯曲载荷位移曲线对比

    Figure  7.  Comparison of bending load displacement curves for HD and HP composites

    图  8  HD和HP复合材料的弯曲强度对比

    Figure  8.  Comparison of bending strength of HD and HP composites

    图  9  HD和HP复合材料的拉伸载荷位移曲线对比

    Figure  9.  Comparison of tensile load displacement curves for HD and HP composites

    图  10  HD和HP复合材料的拉伸强度对比

    Figure  10.  Comparison of tensile strength of HD and HP composites

    图  11  HD和HP复合材料的DSC曲线对比

    Figure  11.  Comparison of DSC curves of HD and HP composites

    图  12  HD和HP复合材料(a) TG, (b) DTG曲线对比

    Figure  12.  Comparison of (a) TG, (b) DTG curves of HD and HP composites

    图  13  (a) HD和(b) HP复合材料的宏观形貌对比

    Figure  13.  Comparison of macroscopic morphology of (a) HD and (b) HP composites

    图  14  HD复合材料的(a) 表面形貌,(b) 3D扫描轮廓图

    Figure  14.  (a) Surface morphology, (b) 3D scanning contour of HD composites

    图  15  HP复合材料的(a) 表面形貌,(b) 3D扫描轮廓图

    Figure  15.  (a) Surface morphology, (b) 3D scanning contour of HP composites

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出版历程
  • 收稿日期:  2024-03-06
  • 修回日期:  2024-04-13
  • 录用日期:  2024-04-21
  • 网络出版日期:  2024-05-24

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