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<p>We investigated the effects of carbon nanotubes (CNTs) on morphology, rheological and mechanical properties, crystallization behavior and thermal conductivity of polypropylene (PP)/propylene-ethylene random copolymer (PEC)/CNT nanocomposites. PP and PEC showed immiscibility, and CNTs were selectively located at the phase interface. Adding CNTs into PP/PEC blends with mass ratio at 70/30 resulted in a significant increase in the melt viscoelasticity of the nanocomposites. At a CNT content of 7.5 wt% relative to the polymer weight, a percolation network of CNTs was formed. CNTs acted as a nucleating agent accelerating the crystallization rate of PP. Significant improvement in the flexibility and toughness of PP was achieved by the introduction of PEC and CNTs. Compared with neat PP, the impact strength and elongation at break of the PP/PEC/CNT nanocomposite containing 10 wt% CNT increased by 1056% and 550% respectively. Furthermore, PP/PEC/CNT nanocomposites showed enhanced thermal conductivity. The combination of controllable mechanical and rheological properties and thermal conductivity would widen the application range of PP-based nanocomposites.</p>

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Effects of multiwall carbon nanotube on the crystallization, rheological and mechanical properties of polypropylene/propylene-ethylene random copolymer blends

  • 期刊论文

  • 发表日期：

    2025年10月21日

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  • Yi Li,
  • Shubo Liu,
  • Hongda Cheng,
  • Changyu Han,
  • Hongliang Hu,
  • Liguang Xiao

摘要

We investigated the effects of carbon nanotubes (CNTs) on morphology, rheological and mechanical properties, crystallization behavior and thermal conductivity of polypropylene (PP)/propylene-ethylene random copolymer (PEC)/CNT nanocomposites. PP and PEC showed immiscibility, and CNTs were selectively located at the phase interface. Adding CNTs into PP/PEC blends with mass ratio at 70/30 resulted in a significant increase in the melt viscoelasticity of the nanocomposites. At a CNT content of 7.5 wt% relative to the polymer weight, a percolation network of CNTs was formed. CNTs acted as a nucleating agent accelerating the crystallization rate of PP. Significant improvement in the flexibility and toughness of PP was achieved by the introduction of PEC and CNTs. Compared with neat PP, the impact strength and elongation at break of the PP/PEC/CNT nanocomposite containing 10 wt% CNT increased by 1056% and 550% respectively. Furthermore, PP/PEC/CNT nanocomposites showed enhanced thermal conductivity. The combination of controllable mechanical and rheological properties and thermal conductivity would widen the application range of PP-based nanocomposites.