PBAT含量对PLA基可降解共混切片及复合熔喷非织造布性能的影响  

Effect of PBAT content on performance of PLA based degradable blend slice and composite meltblown nonwovens

作　　者：和玉光 郝思嘉 田俊鹏 杨程 HE Yuguang;HAO Sijia;TIAN Junpeng;YANG Cheng(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Institute of Graphene Technology,Beijing 100094,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]北京石墨烯技术研究院有限公司,北京100094

出　　处：《材料工程》2024年第3期82-89,共8页Journal of Materials Engineering

基　　金：中国航发北京航空材料研究院基金项目(KJGR210328)。

摘　　要：以聚乳酸(PLA)为基体,聚己二酸-对苯二甲酸-丁二酯(PBAT)为增韧剂,聚乙二醇(PEG)为增塑增容剂,利用双螺杆造粒机,通过熔融共混的方法制备了不同PBAT含量的PLA/PBAT/PEG共混切片,并对共混切片的熔融指数、热稳定性、脆断截面的微观形貌进行了分析,结果表明:PEG对PLA/PBAT复合基体增塑增容效果良好,使得PBAT可均匀分散在PLA基体中,呈现出典型的“海岛”结构,提高了PLA基体的韧性。利用往复式熔喷机,制备了PLA/PBAT/PEG复合熔喷非织造布。通过同步热分析仪、扫描电镜、电子万能试验机研究了PBAT含量对复合熔喷非织造布的热性能、微观结构和力学性能的影响。拉伸测试结果表明,适量的PBAT与PEG可以对PLA基复合熔喷非织造布起到协同增强增韧的作用,其中PLA-3(PBAT在PLA/PBAT复合基体中的质量分数为3%)复合熔喷非织造布与同工艺纯PLA熔喷非织造布相比,横向断裂强力提高48.8%,纵向断裂强力提高28.7%,横纵向断裂伸长率均提高一倍以上。Taking polylactic acid(PLA)as matrix,poly(butylene adipate-co-terephthalate)(PBAT)as toughening agent and polyethylene glycol(PEG)as plasticizer and compatibilizer,PLA/PBAT/PEG blends with different PBAT contents were prepared by melt-blending method using twin-screw granulator,and the melt index,thermal stability and brittle fracture section morphology of the blended slices were analyzed.The results show that PEG has a good plasticizing and capacitating effect on PLA/PBAT composite matrix,which makes PBAT uniformly dispersed in PLA matrix,showing a typical"island"structure and improving the toughness of PLA matrix.The PLA/PBAT/PEG composite meltblown nonwovens were fabricated by a reciprocating meltblown machine.The effects of PBAT content on the thermal properties,microstructure and mechanical properties of composite meltblown nonwovens were investigated by synchronous thermal analyzer,scanning electron microscopy and electronic universal testing machine.The tensile test results show that proper amount of PBAT and PEG can play a synergistic role in strengthening and toughening PLA-based composite meltblown nonwovens.Compared with pure PLA meltblown nonwovens fabricated by identical process,the PLA-3(mass fraction of PBAT in PLA/PBAT composite matrix is 3%)meltblown nonwovens displays a 48.8%increment in transverse breaking strength and a 28.7%reinforcement in longitudinal breaking strength,meanwhile the transverse and longitudinal breaking elongation shows an improvement higher than two-fold.

关 键 词：PLA PBAT 熔喷非织造布 增强增韧 

分 类 号：TS171[轻工技术与工程—纺织材料与纺织品设计]