林业工程学报2017，Vol.2Issue(4)：77-83,7.DOI:10.13360/j.issn.2096-1359.2017.04.013
有机蒙脱土协同壳聚糖基膨胀型阻燃剂阻燃聚乳酸研究
Synergistic effect of organic montmorillonite and chitosan-based intumescent flame retardant on flame retardant properties of polylactic acid
摘要
Abstract
In order to improve the flame retardancy of PLA,anovel intumescent flame retardant (IFR) polylactic acid (PLA) system (PLA/PAMC/MPP/OMMT) was prepared through direct melting-blending technique.The IFR system was composed of phytic acid modified chitosan (PAMC) and melamine phosphate (MPP) together with organic montmorillonite (OMMT) as a synergistic agent.The flammability,burning behavior and thermal stability of the composites were evaluated through the limiting oxygen index (LOI),cone calorimeter test,vertical burning test (UL94) and thermogravimetric analysis (TGA).The char residues of the composites were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) to investigate the synergetic effect of OMMT and PAMC/MPP on the flame retardant properties of PLA composites.After incorporation of 25 wt％ of PAMC/ MPP,compared with PLA1,the LOI value,UL-94 grade and the residue rate at 800℃C of PLA2 were respectively improved from 21.0,no class and 0.61 wt％ to 27.5,V-1 and 17.28 wt％,and the PHRR and THR values respectively decreased from 533.5 kW/m2 and 81.7 MJ/m2to 270.2 kW/m2 and 63.7 MJ/m2.Compared with PLA2,when 0.5 wt％ of PAMC/MPP were replaced by OMMT,the LOI value and the residue rate at 800℃C of PLA3 respectively increased to 30.0 and 18.58％,and the PHRR and THR values decreased to 251.6 kW/m2and 60.6 MJ/m2.The UL-94 test could pass V-0 rating and melt-dripping phenomenon disappeared.The above results indicated that the synergistic flameretardant effect between OMMT and PAMC/MPP showed a satisfied synergistic effect on the flame retardant properties of the PLA composites.The results from this study could provide theoretical basis for the preparation of green flame retardant PLA composites.关键词
聚乳酸/植酸改性壳聚糖/有机蒙脱土/阻燃性能/协效Key words
polylactic acid/phytic acid modified chitosan/organic montmorillonite/flame retardancy/synergistic effect分类
化学化工引用本文复制引用
黎航,刘志鹏,杨政,凌敏,张蕤..有机蒙脱土协同壳聚糖基膨胀型阻燃剂阻燃聚乳酸研究[J].林业工程学报,2017,2(4):77-83,7.基金项目
江苏省自然科学基金项目(BK2012821). （BK2012821）
