聚乳酸接枝硅烷偶联剂的制备及对聚乳酸/木粉复合材料的影响  

Preparation of Poly(Lactic Acid)Grafted with Silane Coupling Agent and Its Influence on Poly(Lactic Acid)/Wood Flour Composites

作　　者：杨琳强 金立维[1,2] 

机构地区：[1]中国林业科学研究院林产化学工业研究所生物质化学利用国家工程实验室国家林业局林产化学工程重点开放性实验室江苏省生物质能源与材料重点实验室,江苏南京210042 [2]中国林业科学研究院林业新技术研究所,北京100091

出　　处：《高分子材料科学与工程》2016年第7期125-130,共6页Polymer Materials Science & Engineering

基　　金：国家科技支撑"十二五"计划项目(2012BAD32B03)

摘　　要：通过反应挤出制备了聚乳酸接枝γ-(甲基丙烯酰氧基)丙基三甲氧基硅(PLA-g-MPS),研究其在聚乳酸/木粉(PLA/WF)复合材料中的偶联作用。核磁共振氢谱证实MPS已接枝到PLA上。使用溶剂洗脱复合材料粒子中的PLA相从而得到WF相,对其红外光谱的分析表明PLA-g-MPS可与WF发生共价键偶联作用。力学性能测试表明,在大分子偶联剂用量仅为3%时,相比未添加的复合材料,拉伸强度、弯曲强度和冲击强度分别提高17.5%,12.4%和88.4%。对复合材料的动态力学分析表明,添加大分子偶联剂会提升PLA与WF间相互作用力从而使材料在玻璃态下的储能模量升高。Poly（lactic acid）grafted withγ-methacryloxy propyl trimethoxyl silane（PLA-g-MPS）was prepared through reactive extrusion and the coupling effect was studied by composites of poly（lactic acid）/wood flour（PLA/WF）.MPS was proved to be grafted on PLA by 1 H-nuclear magnetic resonance（1 H-NMR）.PLA in composites was eluted with solvent and the residual WF was determined by FT-IR spectra.FT-IR spectra indicate that PLA-g-MPS has a function of coupling with WF by covalent bond.Compared with composite without PLA-g-MPS,mechanical property tests show that tensile strength,flexural strength and impact strength of the composite containing 3% macromolecular coupling agent are enhanced by 17.5%,12.4% and 88.4% respectively.Dynamic mechanical analysis（DMA）reveals that interaction force between PLA and WF is improved with the addition of macromolecular coupling agent so that storage modulus under glass state increases.

关 键 词：聚乳酸 γ-(甲基丙烯酰氧基)丙基三甲氧基硅烷 反应挤出 偶联作用 

分 类 号：TQ316.343[化学工程—高聚物工业]