中国塑料 ›› 2024, Vol. 38 ›› Issue (12): 37-42.DOI: 10.19491/j.issn.1001-9278.2024.12.006

• 材料与性能 • 上一篇    下一篇

基于原位成纤与立构复合的PBAT复合材料增强与耐热性能研究

李杨阳1, 张涛1, 乔珉2, 蒋晶2(), 王小峰1, 李倩1   

  1. 1.郑州大学力学与安全工程学院,郑州 450001
    2.郑州大学机械与动力工程学院,郑州 450001
  • 收稿日期:2024-05-06 出版日期:2024-12-26 发布日期:2024-12-25
  • 通讯作者: 蒋晶(1983-),男,副教授,从事聚合物材料高性能和功能化研究,jiangjing@zzu.edu.cn
    E-mail:jiangjing@zzu.edu.cn
  • 基金资助:
    河南省重点研发专项(221111520200)

Study on strengthening and heat resistance of PBAT composites based on in⁃situ fiber formation and stereo⁃composite

LI Yangyang1, ZHANG Tao1, QIAO Min2, JIANG Jing2(), WANG Xiaofeng1, LI Qian1   

  1. 1.School of Mechanics and Safety Engineering,Zhengzhou University,National Center for International Research of Micro?Nano Molding Technology,Zhengzhou 450001,China
    2.School of Mechanical & Power Engineering,Zhengzhou University,Zhengzhou 450001,China
  • Received:2024-05-06 Online:2024-12-26 Published:2024-12-25
  • Contact: JIANG Jing E-mail:jiangjing@zzu.edu.cn

摘要:

基于自行搭建的“熔融共混⁃高速热拉伸”加工设备,将原位成纤与立构复合技术相结合,研究了聚乳酸(PLA)分散相含量对微纤形貌、聚己二酸/对苯二甲酸丁二醇酯(PBAT)基体黏弹性和结晶行为、PLA立构复合晶体(sc⁃PLA)以及PBAT/sc⁃PLA复合材料力学和耐热性能的影响。结果表明,连续制备出纤维直径最小210 nm的PBAT/sc⁃PLA微纤复合材料,PLA微纤在PBAT基体中相互缠结形成网络结构且分散均匀;sc⁃PLA微纤网络结构的存在使复合材料出现显著“类液”向“类固”的黏弹行为转变;纤维诱导作用下,sc⁃PLA相对结晶度和晶体含量得到显著提升,添加30 %(质量分数,下同)PLA后,PBAT/sc⁃PLA复合材料中sc⁃PLA相对结晶度达46.4 %,屈服强度和弹性模量相比纯PBAT分别提升175.3 %和404 %,维卡软化温度(VST)达到近90 ℃。

关键词: 原位成纤, 聚己二酸/对苯二甲酸丁二醇酯, 立构复合晶体, 耐热性, 力学性能

Abstract:

Based on the self⁃built processing equipment for melt blending ⁃ high speed hot drawing, the effects of dispersed phase content of polylactic acid (PLA) on the microfiber morphology, the viscoelasticity, and crystallization behavior of poly(adipate⁃butylene terephthalate) (PBAT) matrix, PLA stereo⁃composite crystal (sc⁃PLA), and the mechanical and thermal properties of PBAT/sc⁃PLA composites were investigated through a combination of in⁃situ fiber formation and stereo⁃composite technologies. The results indicated that the PBAT/sc⁃PLA microfiber composites with a minimum fiber diameter of 210 nm could be continuously prepared, and the PLA microfibers were intertangled in the PBAT matrix to form a network structure and also obtained a uniform dispersion. The presence of the sc⁃PLA microfiber network makes the viscoelastic behavior of the composites change from the “liquid⁃like” to “solid⁃like” state. Under the fiber induction, the relative crystallinity and crystal content of sc⁃PLA in the PBAT/sc⁃PLA composites were significantly increased. After adding 30 wt% PLA, the relative crystallinity of sc⁃PLA in the PBAT/ SC⁃PLA composite reached 46.4 %, and its yield strength and elastic modulus were higher than that of pure PBAT by 175.3 % and 404 %, respectively. Their Vica softening temperatures reached nearly 90 ℃. These research results provide a technical means for the large⁃scale preparation of reinforced and heat⁃resistant PBAT composites.

Key words: in situ fiber formation, polyadipate/butylene terephthalate, stereo?composite crystal, heat resistance, mechanical property

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