聚丙烯/碳纳米管微孔注塑发泡行为及力学性能  

Microcellular Injection Foaming Behaviors and Mechanical Properties of Polypropylene/Carbon Nanotubes Composites

作　　者：袁洪跃 金章勇 蒋晶[2] 刘宪虎 赵振峰[1] YUAN Hongyue;JIN Zhangyong;JIANG Jing;LIU Xianhu;ZHAO Zhenfeng(National Engineering Research Center for Advanced Polymer Processing Technology,Zhengzhou University,Zhengzhou 450002,China;School of Mechanical Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学橡塑模具国家工程研究中心,郑州450002 [2]郑州大学机械与动力工程学院,郑州450001

出　　处：《中国塑料》2020年第6期20-26,共7页China Plastics

摘　　要：研究了不同含量单壁碳纳米管(CNT)的加入对聚丙烯(PP)流变、热稳定性及微孔注塑发泡行为和力学性能的影响。结果表明,随着CNT含量从不足1.0%(质量分数,下同)逐渐增加,PP熔体黏度显著增大,热稳定性逐渐提升,即使CNT的加入量仅为0.15%也会产生团聚现象,但团聚体尺寸较小且与基体结合紧密;微孔发泡注塑样品中泡孔分布不均匀,泡孔尺寸范围在10~70μm,直径随着CNT含量增加呈现先减小后增大;PP/CNT复合材料微孔发泡成型后,弹性模量、屈服应力下降不大,但断裂伸长率平均提升了近400%,不同组分发泡样品间力学性能指标变化不大。The effect of the content of single-walled carbon nanotubes(CNTs)on the rheology,thermal stability,foaming behavior and mechanical properties of microcellular injection-molded polypropylene(PP)/CNTs composites was investigated.The results indicated that the complex viscosity of the composites gradually increased with an increase of CNTs content,and their thermal stability was also improved.The agglomeration occurred with the addition of 0.15 wt%CNTs,and however the size of agglomerates was fairly small and the substrates were tightly bound.The distribution of pores in the microcellular injection-molded samples was nonuniform,and the pore size ranged from 10 to 70μm.The pore diameter decreased at first and then tended to increase with an increase of CNTs content.The elastic modulus and yield stress were found to decrease slightly after the microcellular foaming process according to the uniaxial tensile test results,and however the elongation at break increased by approximately 400%.Moreover,there is no significant change in the mechanical properties of the foamed samples.

关 键 词：聚丙烯 碳纳米管 微孔注塑 泡孔结构 力学性能 

分 类 号：TQ320[化学工程—合成树脂塑料工业]