赤泥对聚乳酸热性能、力学性能和发泡行为的影响研究  

Effect of Red Mud on Thermal,Mechanical Property and Foaming Behavior of PLA

作　　者：刘伟[1] 吴显 张纯[1] LIU Wei;WU Xian;ZHANG Chun(School of Materials and Energy Engineering,Guizhou Institute of Technology,Guiyang 550003,China)

机构地区：[1]贵州理工学院材料与能源工程学院,贵阳550003

出　　处：《中国塑料》2021年第11期49-54,共6页China Plastics

基　　金：贵州省科技计划项目(黔科合支撑[2019]2877号);国家自然科学基金项目(51863003)。

摘　　要：通过熔融共混法制备了二苯基甲烷二异氰酸酯(MDI)改性的聚乳酸/赤泥(PLA/RM)复合材料,并利用超临界CO_(2)固相发泡法对复合材料进行发泡,采用差示扫描量热仪、万能试验机和固相发泡法对复合材料的结晶行为、力学性能和发泡行为进行了研究。结果表明,RM对PLA具有促进结晶的效果,结晶度由5.34%提高至13.89%;RM含量对材料的泡孔参数具有明显控制作用;当加入5%(质量分数,下同)的RM时,发泡材料的泡孔密度降低至1.82×10^(7)个/cm^(3),发泡倍率达到2.25倍,当RM为3%时添加MDI时,泡孔密度由3.28×10^(7)个/cm^(3)提高到12.46×10^(7)个/cm^(3),发泡倍率由2.26倍提高到12.40倍;RM和MDI协同作用对PLA泡沫的泡孔形态和力学性能具有显著的调控作用。Poly(lactic acid)(PLA)/red mud(RM)composites were prepared by melt⁃mixing method,and their crystalli⁃zation,mechanical and foaming behaviors were investigated.The results indicated that RM improved the crystallization of PLA,resulting in an increase in crystallinity from 5.34 wt%to 13.89 wt%.The PLA/RM composites were foamed using a solid⁃state foaming method with supercritical CO_(2) as a blowing agent.The foaming behavior showed that the cellular parameters could be controlled by the RM content.With the addition of 5 wt%RM,the cellular density and expansion ratio of the composites decreased down to 1.82×10^(7) cell/cm^(3) and 2.25 times,respectively.However,the cel⁃lular density and expansion ratio increased up to 12.46×10^(7) and 12.40 fold with the addition of MDI.A combination of RM and MDI could improve the foaming behavior and mechanical property of PLA foams.

关 键 词：聚乳酸 赤泥 发泡材料 复合体系 

分 类 号：TQ321[化学工程—合成树脂塑料工业]