Strong and high void fraction PP/CNS nanocomposite foams fabricated by core-back foam injection molding

Long Wang, Minghui Wu, Qian Ren, Zhengsheng Weng, Wanwan Li, Xiuyu Zhu, Wenge Zheng, Xiaosu Yi

Research output: Journal PublicationArticlepeer-review

3 Citations (Scopus)

Abstract

Polypropylene/carbon nanostructure (PP/CNS) nanocomposite foams with a void fraction as high as 78% were successfully prepared by foam injection molding (FIM) with core-back operation. Rheological curves and differential scanning calorimetry results showed that the added CNS significantly improved the melt strength and accelerated the crystallization process of PP, respectively. A high mold temperature was applied to overcome the adverse effect of CNS, which had a high thermal conductivity and went against the preparation of high void fraction (VF) products. Thus, adding CNS could dramatically increase cell density by three orders of magnitude. With a CNS loading of 5 wt%, the PP/CNS nanocomposite foam with a cell size of about 60 μm, cell density over 107 cells/cm3, and a void fraction of 78% was obtained. More interestingly, the specific flexural modulus of the PP/CNS composite foam with 50% void-fraction was increased by 37% relative to the neat solid injection-molded PP. PP/CNS composite foams with adjustable cell structure and good mechanical properties show great potential for electromagnetic interference (EMI) shielding and sensors applications.

Original languageEnglish
Article numbere53521
JournalJournal of Applied Polymer Science
Volume140
Issue number8
DOIs
Publication statusPublished - 20 Feb 2023

Keywords

  • CNS
  • foam injection molding
  • polypropylene foams

ASJC Scopus subject areas

  • General Chemistry
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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