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<p>Multi-walled carbon nanotubes-filled polyvinyl chloride (MWCNTs/PVC) composites are prepared using four processing methods: a conical twin-screw (CTS) extruder, a Haake mixing apparatus, and parallel twin-screw (PTS) extruders with screw length/diameter ratios of 40:1 and 48:1, respectively. The influences of processing methods on filler dispersion, electrical, dynamic, mechanical properties, as well as thermal stability of MWCNTs/PVC composites are investigated. There are many large-sized (hundreds of micrometers) MWCNTs bundles and aggregates in the CTS extruded samples, and the dispersion is the worst. The PTS extruded MWCNTs/PVC composites have relatively better dispersion and the dispersion improves with increase in length/diameter ratio of the screw. The MWCNTs/PVC sample, prepared using the Haake mixer, mixed for 10&#xa0;min, shows the best dispersion. Improvement of MWCNTs dispersion affects the thermal, electrical and mechanical properties of the composites, leading to increases in surface conductivity, glass transition temperature, flexural modulus, Young’s modulus, and impact strength of the MWCNTs/PVC composites.</p>

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Influence of processing methods on dispersion, electrical and mechanical properties of MWCNTs/PVC composites

  • 期刊论文

  • 发表日期：

    2025年4月21日

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  • Yueqing Ren,
  • Xiaojie Sun,
  • Meng Jiang,
  • Bo Feng,
  • Zhihua Han,
  • Yafei Li

摘要

Multi-walled carbon nanotubes-filled polyvinyl chloride (MWCNTs/PVC) composites are prepared using four processing methods: a conical twin-screw (CTS) extruder, a Haake mixing apparatus, and parallel twin-screw (PTS) extruders with screw length/diameter ratios of 40:1 and 48:1, respectively. The influences of processing methods on filler dispersion, electrical, dynamic, mechanical properties, as well as thermal stability of MWCNTs/PVC composites are investigated. There are many large-sized (hundreds of micrometers) MWCNTs bundles and aggregates in the CTS extruded samples, and the dispersion is the worst. The PTS extruded MWCNTs/PVC composites have relatively better dispersion and the dispersion improves with increase in length/diameter ratio of the screw. The MWCNTs/PVC sample, prepared using the Haake mixer, mixed for 10 min, shows the best dispersion. Improvement of MWCNTs dispersion affects the thermal, electrical and mechanical properties of the composites, leading to increases in surface conductivity, glass transition temperature, flexural modulus, Young’s modulus, and impact strength of the MWCNTs/PVC composites.