摘要
采用动态保压注塑成型技术(DPIM),通过在熔融共混体系中施加往复的剪切应力以改善多壁碳纳米管(MWNT)与高密度聚乙烯(HDPE)注塑制品的结构与性能。偏光显微镜结果显示,成型过程中的剪切有助于碳纳米管在HDPE中的分散,剪切形成的动态样品中碳纳米管的团聚与未施加剪切应力的静态样品相比明显减小。力学性能测试表明动态保压获得的制品,拉伸强度与模量大幅提高,但断裂伸长率降低。在MWNT质量分数为1%时动态复合材料的拉伸强度及模量提高了20%。DSC结果显示,由于碳纳米管充当了成结晶核点的作用,使得复合物的结晶温度提高。
Through a so-called dynamic packing injection molding technology（DPIM）,imposed the back and forth in the shear stress in melt blending system to improve the multi-walled carbon nanotube（MWCNT）and high-density polyethylene（HDPE）plastic injection products structure and properties.Polarizing microscope showed that the shearing in the process of forming contribute to carbon nanotubes to the dispersion in the HDPE,the size of MWCNTs aggregation in the DPIM bar was significantly less than that in the bar obtained by conventional injection.Mechanical properties test showed that tensile strength and modulus of the product by dynamic pressure increased,but elongation at break decreased.Addition of 1% MWCNTs caused an increase of 20% in both of tensile strength and modulus.Moreover,different scanning calorimeter（DSC）showed the crystallization temperature of composite was improved as a result of the crystallization of carbon nanotubes to act as a nuclear point.
出处
《塑料工业》
CAS
CSCD
北大核心
2009年第A02期26-29,共4页
China Plastics Industry
关键词
碳纳米管
高密度聚乙烯
剪切
Carbon Nanotube
High Density Polyethylene
Shearing
