Wang Ruoyu, Kuan Hsu-Chiang, Qiu Aidong, Su Xiao, Ma Jun
School of Engineering and Future Industries Institute, University of South Australia, SA5095, Australia. Department of Energy Application Engineering, Far East University, Tainan County 744, Taiwan.
Nanotechnology. 2020 May 8;31(19):195706. doi: 10.1088/1361-6528/ab5a28. Epub 2019 Nov 21.
Disentangling and dispersing multiwalled carbon nanotubes (MWCNTs) in thermoplastics by the existing melt compounding facilities where neither solvent nor liquid chemicals are allowed remains a great challenge. This challenge is addressed herein by combining ball milling with melt compounding. Specifically, ball milling is applied to disentangle MWCNTs and to eventually liberate each tube from agglomeration, and then the tubes are melt compounded with SSFs (PA6). A uniformly distributed MWCNT network is observed; obvious load transfer from the matrix to the tubes is evidenced by the presence of many firmly embedded tubes on the fracture surface. The electrical conductivity percolation threshold of PA6/MWCNT composites is found to be 2.5-3.0 wt%, in comparison with 5.0-8.0 wt% for PA6/stainless steel fiber composites. The PA6/MWCNT composite at 10.0 wt% shows a 76% increase in flexural modulus and 58% in flexural strength.
在既不允许使用溶剂也不允许使用液态化学品的现有熔融共混设备中，解开并分散热塑性塑料中的多壁碳纳米管（MWCNT）仍然是一项巨大的挑战。本文通过将球磨与熔融共混相结合来应对这一挑战。具体而言，采用球磨来解开MWCNT并最终使每根管子从团聚体中分离出来，然后将这些管子与短切纤维增强材料（PA6）进行熔融共混。观察到形成了均匀分布的MWCNT网络；断裂表面上存在许多牢固嵌入的管子，证明了从基体到管子有明显的载荷传递。发现PA6/MWCNT复合材料的导电渗流阈值为2.5 - 3.0 wt%，相比之下，PA6/不锈钢纤维复合材料的渗流阈值为5.0 - 8.0 wt%。含10.0 wt% MWCNT的PA6/MWCNT复合材料的弯曲模量提高了76%，弯曲强度提高了58%。
