聚乙二醇增塑PLA/La-OMMT纳米复合材料的制备及性能研究  

Preparation and properties of plasticized poly(lactic acid) nano-composite with modified organo-montmorillonites

作　　者：雷海芬[1] 王鹏[1] 张英民[1] 袁维波[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院绿色化学与技术研究中心,哈尔滨150090

出　　处：《材料科学与工艺》2009年第4期457-461,共5页Materials Science and Technology

基　　金：哈尔滨市科技攻关项目(2005AA4CS112)

摘　　要：为改善聚乳酸(PLA)性脆、断裂形变小、韧性差、热稳定性差等问题,采用稀土镧表面改性有机蒙脱土(La-OMMT)对聚乳酸(PLA)进行熔融插层改性,并利用聚乙二醇400(PEG-400)进行增塑改性,最终制备出聚乙二醇增塑聚乳酸/蒙脱土纳米复合材料PLA/La-OMMT/PEG-400.实验结果表明,La-OMMT的加入,提高了复合材料的拉伸强度、弯曲强度和无缺口冲击强度,而PEG-400的加入,在保证复合材料具备一定强度的前提下,显著提高了复合材料的韧性和断裂伸长率.XRD,TEM和SEM结果表明,La-OMMT主要以剥离状态分散在PLA基体中,且La-OMMT和PEG-400的加入,使材料拉伸断面由脆性断裂向韧性断裂转变,由此扩大了PLA的应用范围.In order to resolve the drawbacks of pure poly lactic acid, such as the brittleness, weakness in deformation at break, and lack of thermal stability, poly （ lactic acid） （PLA）/La-OMMT nano-composites plasticized with polyethylene glycol400 were prepared by melt intercalation method. Test on mechanical properties of PLA/La-OMMT shows that the tensile strength, flexural strength and Charpy impact of PLA/La-OMMT are improved with the addition of La-OMMT. The toughness and elongation at break are increased a lot with the addition of PEG-400 as plasticizer. Results of scanning electron microscope （SEM） confirm that the addition of La-OMMT and PEG-400 improves the toughness of PLA. Observation of the micro-structure of nano-composires by X-ray diffraction （XRD） and transmitting electron microscope （TEM） indicates that La-OMMT is exfoliated in PLA/La-OMMT/PEG-400. As a result, the application field of PLA is expanded.

关 键 词：聚乳酸 有机蒙脱土 纳米复合材料 熔融插层 

分 类 号：TB333[一般工业技术—材料科学与工程]