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陈利， 盛春英， 张建明
（青岛科技大学 橡塑材料与工程教育部重点实验室， 山东 青岛 266042）
摘要：用溶液法制备了聚乳酸/多壁碳纳米管（PLA/MWNTs）复合材料，研究了退火处理对该复合材料拉伸性能的影响，并通过DSC和XRD表征对因退火导致的PLA/MWNTs复合材料拉伸性能的变化原因进行了研究。结果表明，硅烷偶联剂可提高MWNTs在PLA中的分散性，并提高所得复合材料的强度。80 ℃退火处理可以提高纯PLA和PLA/MWNTs复合材料的结晶度和拉伸强度，用硅烷对MWNTs进行表面处理可大大提高复合材料的屈服强度。MWNTs或f-MWNTs可作为异相成核剂，在制备过程或退火处理过程中诱导PLA分子链有序排列，提高复合材料的结晶速度、结晶度和强度。
关键词：聚乳酸； 碳纳米管； 复合材料； 拉伸性能； 退火
中图分类号： TQ 32文献标志码： A
Investigation of Effects of Annealing on Tensile Properties of Poly(lactide acid)/Multi-walled Carbon Nanotubes Composites
CHEN Li, SHENG Chun-ying, ZHANG Jian-ming
(Key Laboratory of Rubber-plastics，Ministry of Education, Qingdao University of Science and Technology, Qingdao 266042, China)
Abstract: Polylactide acid(PLA) composites filled with multi-walled carbon nanotbues(MWNTs)were prepared using solution mixing and the effects of annealing on tensile properties of composites were investigated via DSC and XRD characterizations. The results indicated that silane coupling agent could improve the dispersion of MWNTs in PLA matrix and also the tensile strength of the composites. The annealing at 80 ℃ could increase the crystallinity and strengths of PLA and PLA/MWNTs composite. Surface treatment by using silane could greatly enhance the yield strength of PLA/MWNTs composites. MWNTs acting as a heterogeneous nucleating agent could induce the PLA molecular chain to form orderly alignment and increase the crystallization rate, crystallinity and strength of the composites in preparing or annealing PLA composites.
Key words: poly (lactide acid) (PLA); multi-walled carbon nanotubes(MWNTs); composites; tensile properties; annealing
收稿日期： 2010-11-18
基金项目：青岛科技大学博士基金项目（0022145）；山东省泰山学者建设工程基金项目（TS20081120）.
作者简介：陈利(1972—)，男，副教授.
