中文摘要：

采用聚乙烯醇（PVA）交联对洋麻（KF）增强聚丙烯（PP）、棕榈（PF）增强聚丙烯（PP）复合材料进行改性,通过模压成型工艺制备KF/PP和PF/PP复合材料。研究不同交联方法对复合材料的结构和性能的影响,采用SEM、DMA等技术研究了改性对复合材料的界面结合及力学性能影响。结果表明：PVA协同偶联剂交联改性对天然纤维/PP复合材料的综合改性效果最好,当用5%PVA＋3%偶联剂对KF/PP改性时,KF/PP复合材料的弯曲强度提升25.2%,弯曲模量提升35.49%,剪切强度提升28%,分别达到了50.90 MPa、5.76 GPa、5.4MPa。当用5%PVA＋2%偶联剂对PF/PP改性时,PF/PP复合材料的弯曲强度提升31.46%,弯曲模量提升27.07%,剪切强度提升21.75%,分别达到44.33MPa、2.32GPa、5.18MPa。改性后KF/PP、PF/PP复合材料的含水率分别下降了46.89%、10.63%,吸水率分别下降了8.57%、6.12%。KF/PP改性后储能模量提高20.93%,PF/PP改性后Tg值由90.1℃上升到113.8℃。SEM表明：PVA协同偶联剂交联改性有效改善了纤维与PP间的粘结,纤维与PP间的界面结合得到改善。

英文摘要：

The composites of kenaf（KF）reinforced polypropylene（PP）and palm（PF）reinforced polypropylene（PP）were modified by PVA crosslinking.PF/PP and KF/PP composites were prepared by compression molding process.The effects of different crosslinking methods on the structure and properties of composites were studied.SEM and DMA were used to describe the interfacial bonding and mechanical properties of the composites.The results reveal that the PVA and coupling agent have the best effect on the natural fiber reinforce PP composite.When the KF/PP is modified by 5%PVA and 3% coupling agent,the flexural strength increases by 25.2%,the flexural modulus increases by 35.49%,and the shear strength increases by 28%,which reach 50.90 MPa,5.76 GPa,5.4MPa,respectively.When the PF/PP is modified by 5%PVA and 2%coupling agent,the flexural strength increases by 31.46%,the flexural modulus increases by 27.07%,and the shear strength increases by 21.75%,which reach44.33 MPa,2.32 GPa,5.18 MPa,respectively.The water content of the modified KF/PP and PF/PP composites are reduced by 46.89% and 10.63%,respectively,the water absorption of the modified KF/PP and PF/PP composites are reduced by 8.57% and 6.12%,respectively.After the modification of KF/PP,the storage modulus in-creases by 20.93%.The Tgvalue of the modified PF/PP composite increase from 90.1℃to 113.8℃,which increases by 26.30%.SEM reveal that the crosslinking modification of PVA and coupling agent effectively improve the adhesion between fiber and polypropylene,and the interface bonding between the fiber and polypropylene is also improved.