表面改性纳米SiO2增强木质纤维/聚氯乙烯复合材料性能

摘要

SiO2粒子经偶联剂γ-氨丙基三乙氧基硅烷(KH550)表面改性后,与木质纤维、聚氯乙烯(PVC)及其它助剂通过熔融混炼制备改性 SiO2-木质纤维/PVC复合材料,用 FTIR、SEM和同步热分析仪(STA)对 SiO2粒子和SiO2-木质纤维/PVC复合材料的结构与性能进行测试与表征.FTIR 分析表明,SiO2粒子表面接枝了 KH550的特征官能团,KH550成功地接枝到 SiO2粒子表面;SEM分析表明,改性纳米 SiO2粒子能在木质纤维/PVC复合材料中均匀分散,其粒径在100 nm左右;添加改性的SiO2粒子后,木质纤维和PVC结合更加紧密,孔洞间隙减少.纳米 SiO2质量分别占木质纤维质量的10%、8%和10%时,SiO2-木质纤维/PVC复合材料的弹性模量、拉伸强度、冲击强度分别达到最优值4.66 GPa、31.12 MPa和4.11 kJ/m2,与未添加 SiO2的复合材料相比分别提高了50.29%、28.91%和16.65%.%The surface modification of nano SiO2particles withγ-aminopropyl triethoxysilane(KH550)was carried out,The SiO2-wood fiber/polyvinyl chloride(PVC)composites were prepared by melt-mixing with wood fiber,PVC and other additives.The structure and properties of SiO2particles and SiO2-wood fiber/PVC composites were tested and characterized by FTIR,SEM and STA.FTIR analysis shows that the surface of SiO2particles bond KH550 characteristic organic functional group,KH550 successfully grafts to the surface of SiO2particles.SEM analysis shows that the modified nano-SiO2particles can be dispersed uniformly in the SiO2-wood fiber/PVC composites with a particle size of about 100 nm;After adding the modified SiO2particles,the combination of wood fiber and PVC is more tight,the hole gap is reduced.When the mass ratio of nano SiO2to wood flour mass is 10%,8%,10%,the me-chanical property of the SiO2-wood fiber/PVC composites will reach the optimal state:elastic modulus,tensile-strength and impact-strength are 4.66 GPa,31.12 MPa and 4.11 kJ/m2,increased by 50.29%,28.91% and 16.65%,respectively.