Properties of montmorillonite/ silane-modif ied wood flour/ PVC composites
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摘要: 用硅烷YH-62 对木粉(WF) 和插层蒙脱土(OMMT) 进行表面改性, 熔融共混挤出制备了OMMT/ 硅烷改性木粉(STWF) / 聚氯乙烯( PVC) 复合材料。分析了硅烷改性和添加蒙脱土含量对材料力学性能的影响。用X射线衍射(XRD) 、透射电镜( TEM) 和扫描电镜(SEM) 观察了蒙脱土的插层和分散效果, 用傅立叶红外光谱( FTIR) 、X 射线光电子能谱(XPS) 研究了硅烷改性效果, 分析了表面接枝反应机理。结果表明, 硅烷偶联剂与木粉形成了有效的化学键, 并能够与OMMT 表面产生化学连接, 改善木粉与PVC 及蒙脱土间的界面相容性, 提高了木塑材料的力学性能。在适量加入OMMT 后, 木塑材料的力学性能得到了进一步改善。但含量过高, 会形成厚界面层, 甚至使OMMT 和木粉团聚, 分布不均匀, 引起性能降低。Abstract: The surfaces of intercalated montmorillonite (OMMT) and wood flour (WF) were modified by silanecoupling agent Ti-14. They were melt-blended and ext ruded into wood plastic composites samples. The effect s ofthe content s of OMMT and WF on the composites mechanical properties were investigated. The intercalation anddispersion of OMMT were observed by XRD , TEM and SEM. FTIR and XPS were used to analyze the silane modification effect s. The reaction mechanisms were proposed. The graf ting improves the interfacial compliance betweencomponent s and result s in higher properties of the composites. Adding OMMT can reinforce further the composites.However , a thicker interfacial layer which is weak will form and the st ress-concent ration will impair the compositesproperties when the content s of OMMT or coupling agent are higher.
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Key words:
- wood-plastic composites /
- wood flour /
- silane coupling agent /
- intercalated montmorillonite /
- PVC
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