Foam injection molding of polypropylene/stainless steel fiber composites for efficient EMI shielding

A. Ameli, M. Nofar, M. Saniei, S. Wang, C. B. Park*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

Lightweight polypropylene/stainless-steel fiber (PP-SSF) composites with 15-35% density reduction were fabricated using foam injection molding and supercritical carbon dioxide (CO2). The electrical percolation threshold, through-plane electrical conductivity, and electromagnetic interference (EMI) shielding effectiveness (SE) of the PP-SSF composite foams were characterized and compared against the solid samples. The effects of the plasticizing gas and the void fraction on fiber breakage and orientation were also investigated. Microstructure characterization showed that the presence of dissolved CO2 decreased fiber breakage by about 30%, and together with foaming action, contributed to less preferential orientation of fibers. Consequently, the percolation threshold decreased up to four folds from 0.85 to 0.21 vol.% as the void fraction increased from 0 to 35%. The specific EMI SE was also significantly enhanced. A maximum specific EMI SE of 75 dB.g-1cm3 was achieved in PP-1.1 vol.% SSF composite foams, which was highly superior to 38 dB.g-1cm3 of the solid PP-1.0 vol.% SSF composites. The results reveal that light and efficient products with a lower fiber content can be developed by foam for EMI shielding applications.

Original languageEnglish
Title of host publicationProceedings of PPS 2015
Subtitle of host publicationThe 31st International Conference of the Polymer Processing Society - Conference Papers
EditorsByungohk Rhee
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735413603
DOIs
Publication statusPublished - 9 Mar 2016
Externally publishedYes
Event31st International Conference of the Polymer Processing Society, PPS 2015 - Jeju Island, Korea, Republic of
Duration: 7 Jun 201511 Jun 2015

Publication series

NameAIP Conference Proceedings
Volume1713
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference31st International Conference of the Polymer Processing Society, PPS 2015
Country/TerritoryKorea, Republic of
CityJeju Island
Period7/06/1511/06/15

Bibliographical note

Publisher Copyright:
© 2016 AIP Publishing LLC.

Keywords

  • Conductive Polymer Composites
  • Electrical properties
  • EMI Shielding
  • Foaming
  • Injection Molding

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