中国塑料 ›› 2022, Vol. 36 ›› Issue (8): 56-61.DOI: 10.19491/j.issn.1001-9278.2022.08.009

• 材料与性能 • 上一篇    下一篇

聚乙二醇对聚乳酸/淀粉纳米晶复合材料性能的影响

曲玉婷1,2, 王立梅2,3, 齐斌1,3()   

  1. 1.苏州大学药学院,江苏 苏州 215000
    2.苏州市食品生物技术重点实验室,江苏 常熟 215500
    3.常熟理工学院生物与食品工程学院,江苏 常熟 215500
  • 收稿日期:2022-04-08 出版日期:2022-08-26 发布日期:2022-08-22
  • 通讯作者: 齐斌(1965—),男,教授,从事生物化工研究,qibin65@126.com
    E-mail:qibin65@126.com
  • 基金资助:
    江苏省科技厅重点研发计划(BE2020386);苏州市科技计划项目(SS202120)

Effect of poly(ethylene glycol) on properties of poly(lactic acid)/starch nanocrystal composites

QU Yuting1,2, WANG Limei2,3, QI Bin1,3()   

  1. 1.College of Pharmaceutical Sciences,Soochow University,Suzhou 215000,China
    2.Key Laboratory of Food and Biotechnology of Suzhou,Changshu 215500,China
    3.College of Biological and Food Engineering,Changshu Institute of Technology,Changshu 215500,China
  • Received:2022-04-08 Online:2022-08-26 Published:2022-08-22
  • Contact: QI Bin E-mail:qibin65@126.com

摘要:

以聚乳酸(PLA)和淀粉纳米晶(SNC)为主要原料,聚乙二醇(PEG)为增塑剂,采用溶剂蒸发法制备PLA/SNC和PLA/SNC/PEG复合材料,通过差示扫描量热仪(DSC)、热台偏光显微镜(PLM)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)等研究了PEG对复合材料结晶行为、力学性能及界面相容性的影响。结果表明,PEG能够与SNC协同促进PLA结晶,使PLA/SNC/PEG复合材料的结晶速率明显提高;PEG的添加未改变PLA/SNC复合材料的结晶结构;随着PEG含量的增加,PLA/4 %(质量分数,下同)SNC复合材料的拉伸强度先升高后下降,断裂伸长率不断提高;当PEG含量为2 %时,PLA/4 %SNC/2 %PEG复合材料的力学性能最佳,拉伸强度为47.86 MPa,断裂伸长率为10.20 %,PLA与SNC间界面相容性得到改善。

关键词: 聚乳酸, 淀粉纳米晶, 界面相容性, 复合材料, 聚乙二醇

Abstract:

poly(lactic acid) (PLA)/starch nanocrystal (SNC) and PLA/SNC/poly(ethylene glycol) (PEG) composites were prepared through solvent evaporation using PLA and SNC as raw materials and PEG as a plasticizer. The effects of PEG on the crystallization behavior, mechanical properties, and interfacial compatibility of the composites were investigated using differential scanning calorimetry, hot?stage polarizing microscopy, X?ray diffractometry, and scanning electron microscopy. The results indicated that PEG could synergistically promote the crystallization of PLA together with SNC, resulting in a significant increase in the crystallization rate of PLA/SNC/PEG composites. The crystalline structure of PLA/SNC composites was not changed with the addition of PEG. The composite containing 4 wt% SNC showed an increase at first and then a decrease in tensile strength with an increase in the PEG content. However, its elongation at break kept an increasing trend. The composite containing 4 wt% SNC and 2 wt% PEG obtained optimal mechanical properties with tensile strength of 47.86 MPa and elongation at break of 10.20 %. The interfacial compatibility between PLA and SNC was improved.

Key words: poly(lactic acid), starch nanocrystal, interfacial compatibility, composite material, poly(ethylene glycol)

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