Effect of length of carbon nanotubes on electromagnetic interference shielding and mechanical properties of their reinforced epoxy composites

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• 作者：B. P. Singh (1) (2)
  Kamal Saini (1)
  Veena Choudhary (2)
  Satish Teotia (1)
  Shailaja Pande (1)
  Parveen Saini (3)
  R. B. Mathur (1)
  
• 关键词：Multiwalled carbon nanotubes ; Electromagnetic interference shielding ; Epoxy resin ; Nanocomposites
• 刊名：Journal of Nanoparticle Research
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：16
• 期：1
• 全文大小：
• 作者单位：B. P. Singh (1) (2)
  Kamal Saini (1)
  Veena Choudhary (2)
  Satish Teotia (1)
  Shailaja Pande (1)
  Parveen Saini (3)
  R. B. Mathur (1)
  
  1. Physics and Engineering of Carbon, Division of Materials Physics and Engineering, CSIR-National Physical Laboratory, New Delhi, 12, India
  2. Centre for Polymer Science and Engineering, Indian Institute of Technology Delhi, Delhi, 16, India
  3. Polymeric and Soft Materials Section, CSIR-National Physical Laboratory, New Delhi, 12, India
  
• ISSN：1572-896X

文摘

The high performance-multiwalled carbon nanotubes (MWCNTs) reinforced epoxy resin nanocomposites have been fabricated using industrially viable fast process of dispersion with high speed homogenizer (~30,000 rpm). This high energy homogenizer was found to be a successful technique for uniformly dispersion of MWCNTs and confirmed by scanning electron microscopy. Herein, two different lengths of MWCNTs, i.e., long length of ~350 aligned bundle (l-MWCNT) and short length of 1.5 (s-MWCNT) were used as reinforcement in epoxy resin. The effect of length of MWCNTs on the mechanical, electrical, and electromagnetic interference (EMI) shielding properties of MWCNTs/epoxy nanocomposites is investigated. The percolation threshold was obtained at 0.02wt% for l-MWCNT compared to 0.11 for s-MWCNT. Due to very low percolation threshold and enhanced electrical conductivity (1.37103Scm1 for 0.5wt% l-MWCNT and 0.95103Scm1 for 0.5wt% s-MWCNT), absorption dominated EMI shielding effectiveness was achieved 16dB for l-MWCNT compared to 11.5dB for s-MWCNT with 0.5wt% loading in Ku-band (12.48GHz). This is the highest reported value for MWCNTs-epoxy composites for low loading level of 0.5wt% at 2.5-mm thickness. In addition to this, flexural strength of the composites was found to be 125MPa at 0.3wt% for l-MWCNT and 113MPa at 0.3wt% for s-MWCNT from 95MPa of pure cured epoxy suggesting the usefulness of this of material as strong microwave absorber.