纳米Al_2O_3/PP/木纤维复合材料力学性能研究

Study on the mechanical properties of nano-Al_2O_3 /PP/wood fiber composites

通过偶联剂KH550改性纳米Al_2O_3后加入到木纤维中,再与PP进行混炼,热压成型,制得复合材料。测试其力学性能并利用红外、扫描电镜进行表征。分析表明KH550能够很好地改性纳米Al_2O_3,添加纳米Al_2O_3改善了PP和木纤维之间的界面相容性,宏观上表现为力学性能提高。当纳米Al_2O_3添加质量分数为5%时,复合材料的力学性能提升最大,其弯曲强度、弯曲模量、冲击强度分别是43.79 MPa,3817 MPa,7.515 KJ·M2,对比未添加纳米粒子的复合材料分别提升55%、34%、21%。

The nano-Al2O3 modified and dispersed by KH550 joined into the wood fiber, then mixing and hot press molding with polypropylene（PP）, then wood plastic composites was made out, then characterized by means of Fourier Transform infrared spectroscopy（FTIR） and Search Engine Marketing（SEM）. The result show that 3-Triethoxysilylpropylamine APTES（KH550） was successfully grafted, and that with adding nano-Al2O3 the compatibility of composites in the blend system was enhanced and the interfacial adhesion between wood fiber and PP was also improved, thus it exhibited the elevation of the mechanical property. When the mass fraction of nano-Al2O3 after adding was 5%, the improvement of mechanical properties was the largest to composites, the flexural strength, the flexural modulus, the impact strength were 43.79 MPa, 3817 MPa, 7.515 KJ·M^2, respectively increased by 55%,34%, 21%.