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竹纤维和海藻酸钠提升聚乳酸的降解性能

柴喜存 周凌蕾 何春霞

柴喜存, 周凌蕾, 何春霞. 竹纤维和海藻酸钠提升聚乳酸的降解性能[J]. 复合材料学报, 2023, 40(6): 3553-3561. doi: 10.13801/j.cnki.fhclxb.20220901.003
引用本文: 柴喜存, 周凌蕾, 何春霞. 竹纤维和海藻酸钠提升聚乳酸的降解性能[J]. 复合材料学报, 2023, 40(6): 3553-3561. doi: 10.13801/j.cnki.fhclxb.20220901.003
CHAI Xicun, ZHOU Linglei, HE Chunxia. Study on bamboo fiber and sodium alginate enhancing the degradability of polylactic acid[J]. Acta Materiae Compositae Sinica, 2023, 40(6): 3553-3561. doi: 10.13801/j.cnki.fhclxb.20220901.003
Citation: CHAI Xicun, ZHOU Linglei, HE Chunxia. Study on bamboo fiber and sodium alginate enhancing the degradability of polylactic acid[J]. Acta Materiae Compositae Sinica, 2023, 40(6): 3553-3561. doi: 10.13801/j.cnki.fhclxb.20220901.003

竹纤维和海藻酸钠提升聚乳酸的降解性能

doi: 10.13801/j.cnki.fhclxb.20220901.003
基金项目: 自治区区域协同创新专项(2019 E0241);江苏省研究生科研与实践创新计划项目(KYCX21_0574)
详细信息
    通讯作者:

    何春霞,博士,教授,博士生导师,研究方向为新型工程材料、可降解高分子材料 E-mail: chunxiahe@tom.com

  • 中图分类号: TB332

Study on bamboo fiber and sodium alginate enhancing the degradability of polylactic acid

Funds: Regional Cooperative Innovation in Autonomous Region (2019 E0241); Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX21_0574)
  • 摘要: 为提高聚乳酸(PLA)的降解性,将竹纤维(BF)和海藻酸钠(SA)与PLA共混制备复合材料,并进行土壤降解试验以探究其降解性能,检测降解后复合材料的质量损失率、表面微观结构、官能团变化、热性能和结晶度等指标。结果表明:SA和BF均可提升PLA复合材料降解的质量损失率。降解21天后,BF/PLA和SA-BF/PLA复合材料的质量损失率分别为0.83%和2.54%,相较于纯PLA的0.11%分别提高了7.55和23.09倍。降解后,SA-BF/PLA复合材料的表面出现大量的裂痕与凹陷,这增大了复合材料与土壤中的接触面积,进而加速了复合材料的降解。纯PLA在降解过程中质量损失率很低,但降解后其羰基含量明显上升,表明土壤降解会导致部分PLA长链高分子断裂为小分子。相比于纯PLA,BF/PLA和SA-BF/PLA复合材料的结晶度大幅度降低,表明SA和BF可降低PLA复合材料的结晶度,提高其降解性。由此可见,SA和BF可提升PLA复合材料的降解性能。此研究结果将为高降解性PLA复合材料的制备提供理论参考。

     

  • 图  1  土壤降解过程中聚乳酸(PLA)、竹纤维(BF)/PLA、海藻酸钠(SA)-BF/PLA复合材料的质量损失率

    Figure  1.  Msss loss rate of polylactic acid (PLA), bamboo fiber (BF)/PLA, sodium alginate (SA)-BF/PLA composites during degradation

    图  2  降解前后不同PLA复合材料试样照片

    Figure  2.  Pictures of different PLA composites before/after degradation

    图  3  土壤降解对PLA复合材料力学性能的影响:(a) 拉伸强度;(b) 弯曲强度;(c) 冲击强度;(d) 硬度

    Figure  3.  Effects of soil degradation on mechanical properties of PLA composites: (a) Tensile strength; (b) Flexural strength; (c) Impact strength; (d) Rockwell hardness

    图  4  土壤降解后不同PLA复合材料接触角的变化

    Figure  4.  Changes of contact angle of different PLA composites after soil degradation

    图  5  土壤降解对不同PLA复合材料表面微观结构的影响

    Figure  5.  Effects of soil degradation on microstructure of different PLA composites

    图  6  土壤降解后不同PLA复合材料和原材料的FTIR图谱:(a) PLA;(b) BF/PLA;(c) SA-BF/PLA;(d) 原材料

    Figure  6.  FTIR spectra of different PLA composites after degradation and the raw materials: (a) PLA; (b) BF/PLA; (c) SA-BF/PLA; (d) Raw materials

    图  7  土壤降解对不同PLA复合材料热性能的影响

    Figure  7.  Effects of soil degradation on thermal properties of different PLA composites

    *—Composites which were degradation for 21 days

    图  8  降解前后不同PLA复合材料的XRD图谱

    Figure  8.  XRD patterns of different PLA composites before/after soil degradation

    表  1  土壤降解前后不同PLA复合材料的热重分析数据

    Table  1.   Thermogravimetric analysis data of different PLA composites before/after soil degradation

    TreatmentsInitial temperature/℃Peak temperature/℃Final temperature/℃Residue at 800℃/%
    PLA349.5377.3384.05.51
    PLA*354.7376.7387.59.58
    BF/PLA331.8345.8358.415.79
    BF/PLA*346.6356.3368.417.64
    SA-BF/PLA304.3313.6331.419.19
    SA-BF/PLA*334.8343.3361.017.58
    下载: 导出CSV
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  • 收稿日期:  2022-07-06
  • 修回日期:  2022-08-08
  • 录用日期:  2022-08-26
  • 网络出版日期:  2022-09-02
  • 刊出日期:  2023-06-15

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