纳米SiO_(2)增强HDPE复合材料的力学性能和耐热性能研究

Study on Mechanical Properties and Heat Resistance Properties of Nano-SiO_(2) Reinforced HDPE Composites

文章利用硅烷偶联剂(KH-570)改性纳米SiO_(2)(nano-SiO_(2)),将nano-SiO_(2)与高密度聚乙烯(HDPE)混合,制备了HDPE/nano-SiO_(2)复合材料。对HDPE/nano-SiO_(2)复合材料的力学性能和耐热性能进行探究。结果表明:KH-570成功接枝到nano-SiO_(2)表面。随着nano-SiO_(2)掺量的增加,HDPE/nano-SiO_(2)复合材料的拉伸强度、弯曲强度和冲击强度均先升高后降低。当nano-SiO_(2)掺量为3%时,HDPE/3%nano-SiO_(2)复合材料的力学性能和耐热性能达到最优,其拉伸强度、弯曲强度和抗冲击强度,分别达到39.6 MPa、32.5 MPa和16.9 kJ/m2,比纯HDPE分别提高了73.7%、59.3%和36.3%。HDPE/3%nano-SiO_(2)复合材料的初始热分解温度比纯HDPE提高了101℃,质量保留率为6.2%。

The HDPE/nano-SiO_(2) composites were prepared using silane coupling agent(KH-570)to modify nano-SiO_(2) and mix nano-SiO_(2) with high-density polyethylene(HDPE).The mechanical properties and heat resistance of HDPE/nano-SiO_(2) composites were explored.The results showed that KH-570 was successfully grafted onto the surface of nano-SiO_(2).With the increase of nano-SiO_(2) content,the tensile strength,flexural strength and impact strength of HDPE/nano-SiO_(2) composites first increased and then decreased.When the nano-SiO_(2) content is 3%,the mechanical properties and heat resistance of HDPE/3%nano-SiO_(2) composites reach the best,and their tensile strength,bending strength and impact strength reach 39.6 MPa,32.5 MPa and 16.9 kJ/m2,respectively,which are 73.7%,59.3%and 36.3%higher than those of pure HDPE,respectively,and the initial thermal decomposition temperature of HDPE/3%nano-SiO_(2) composites is increased by 101℃compared with pure HDPE,the quality retention rate of HDPE/3%nano-SiO_(2) is 6.2%.