改性木粉/PVC复合材料的制备与性能研究

采用在水相中进行木粉表面接枝聚甲基丙烯酸甲酯（PMMA）的方法对木粉进行改性,通过红外光谱法分析了改性木粉表面结构的变化并讨论了接枝反应机理。制备了改性木粉/PVC复合材料,并进行了力学性能的测试。结果显示,通过水相接枝PMMA的方法,木粉表面的部分羟基被PMMA链取代。改性木粉/PVC复合材料的拉伸强度和冲击强度均高于未改性木粉体系。扫描电子显微镜（SEM）显示了改性木粉与PVC基体间的界面粘结较紧。实验证明了表面接枝PMMA的方法有效的改善了木粉和PVC基体之间的相容性。

Study on Preparation and Properties of Modified Wood-flour/PVC Composite

The method that wood fiber was modified by grafting PMMA in water phase was investigated. The structur- al change in surface of wood was confirmed by infrared spectrum technique and the grafting reaction mechanism was discussed. The modified wood flour/PVC composites were prepared and their mechanical properties were measured. The result showed that the partial hydroxyl groups of surface were substituted by PMMA chain. The tensile and impact strength of composite were improved by the modified wood-flour. Under a scanning electron microscope （SEM）, it was observed that the interface between modified wood flour and PVC matrix was closely bond. The experiment proved that the method of grafting PMMA effectively improved the compatibility between a wood-flour and PVC matrix.