纳米CaCO_3对木纤维增强生物可降解复合材料力学性能的影响  

Effect of Nano CaCO_3 on the Mechanical Performance of Wood Fiber Reinforced Biodegradable Composites

作　　者：吴义强[1] 秦志永[1] 李新功[1] 卿彦[1] 

机构地区：[1]中南林业科技大学材料科学与工程学院

出　　处：《林产工业》2012年第2期19-22,共4页China Forest Products Industry

基　　金：国家"948"资助项目(2009-4-51);国家"十一五"科技支撑计划课题(2008BADA9B0102);国家林业公益性行业科研重大专项(2011432004);湖南省教育厅高校产业化培育项目(11cy027)

摘　　要：为探索纳米CaCO_3对增强生物可降解复合材料力学性能的影响,采用混炼、注射成型工艺制备纳米CaCO_3改性木纤维/聚乳酸复合材料,研究了纳米粒子添加量(1wt%,2wt%,3wt%,4wt%)及粒子预处理(偶联剂,硬脂酸,偶联剂-硬脂酸)对材料拉伸性能与冲击性能的影响。随着CaCO_3添加量增加,复合材料力学强度先增大后减小,质量分数2%时材料拉伸强度和冲击强度分别提高8%与20%,粒子的增韧效果明显。预处理不仅能增强木纤维与聚乳酸的结合,也提高了纳米粒子分散性,增强材料整体力学性能。纳米粒子在聚合物基体中的分散性及其与聚合物界面结合是影响材料性能的关键。In order to explore the influence of nano CaCO3 on the mechanical performance of plant fiber reinforced biodegradable composites.Wood fiber/polylactic acid composites were manufactured by mixing and twin-screw extruding,and the effects of nano-particles content（ranging from 1wt%to 4wt%） and pretreatments （coupling,stearic acid,coupling-stearic acid） on composites tensile and impact properties were investigated. Results showed that mechanical performance of the composites presented an increase trend when content of nanoparticles ranging from 1wt%to 2wt%,and reduced sharply later.The tensile and impact strength increased by 8%and 20%respectively when the mass content was 2wt%and the enhancement effect of nanoparticles on the composite toughness was obvious.Pretreatments could not only improve the bonding strength between wood fibers and polymers,but also improved the dispersibility of nanoparticles which could not only improve the integral mechanical performance.Dispersibility and interfacial efficiency of nanoparticles were the fundamental factors affecting the composites mechanical performance.

关 键 词：纳米CACO3 生物可降解复合材料 拉伸强度 冲击强度 

分 类 号：TB332[一般工业技术—材料科学与工程]