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  

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

作　　者：李杨阳 张涛[1] 乔珉 蒋晶[2] 王小峰[1] 李倩[1] LI Yangyang;ZHANG Tao;QIAO Min;JIANG Jing;WANG Xiaofeng;LI Qian(School of Mechanics and Safety Engineering,Zhengzhou University,National Center for International Research of Micro-Nano Molding Technology,Zhengzhou 450001,China;School of Mechanical&Power Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[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

出　　处：《中国塑料》2024年第12期37-42,共6页China Plastics

基　　金：河南省重点研发专项(221111520200)。

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(scPLA)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℃。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 fi-ber 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 in-duction,the relative crystallinity and crystal content of sc-PLA in the PBAT/sc-PLA composites were significantly in-creased.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%,respec-tively.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.

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 

分 类 号：TQ325.5[化学工程—合成树脂塑料工业]