表面改性纳米SiO2增强木质纤维/聚氯乙烯复合材料性能
Properties of wood fiber/polyvinyl chloride composites reinforced by surface modified nano SiO2

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 SiO2 particles with γ-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 SiO2 particles and SiO2-wood fiber/PVC composites were tested and characterized by FTIR, SEM and STA.FTIR analysis shows that the surface of SiO2 particles bond KH550 characteristic organic functional group, KH550 successfully grafts to the surface of SiO2 particles. SEM analysis shows that the modified nano-SiO2 particles can be dispersed uniformly in the SiO2-wood fiber/PVC composites with a particle size of about 100 nm; After adding the modified SiO2 particles, the combination of wood fiber and PVC is more tight, the hole gap is reduced. When the mass ratio of nano SiO2 to wood flour mass is 10%, 8%, 10%, the mechanical 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. 国家林业公益性行业科研专项资助项目（201504503）；国家自然科学基金（31770606）；湖南省科技重大专项（2017NK1010）