Cell development in microcellular injection molded polyamide-6 nanocomposite and neat resin

Alexander Chandra, Shaoqin Gong, Lih Sheng Turng*, Paul Gramann

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

16 Scopus citations


The effects of nanoclay addition into polyamide-6 (PA-6) neat resin and processing parameters on cell density and size in microcellular injection molded components are investigated. The analyses are performed on the sprue section of standard ASTM D 638-02 tensile bars molded based on a fractional four-factorial, three-level, L9 Taguchi design of experiments (DOE) with varying melt temperature, injection speed, super critical fluid (SCF) concentration, and shot size. It is found that the presence of nanoclay greatly reduced the cell size and increased the cell density when compared to neat resin processed under identical molding conditions. In addition, cell size distribution at the sprue center was, in general, the largest, gradually decreasing toward the skin for both the neat resin and the nanocomposite. Finally, in contrast to neat resin, in which shot size and injection speed were important to cell density and all molding parameters affected cell growth, the cell size and density for nanocomposite only depended strongly on shot size.

Original languageEnglish
Pages (from-to)371-382
Number of pages12
JournalJournal of Cellular Plastics
Issue number5
StatePublished - 09 2004
Externally publishedYes
EventANTEC 2004 - Annual Technical Conference Proceedings - Chicago, IL., United States
Duration: 16 05 200420 05 2004


  • Cell morphology
  • Microcellular injection molding
  • Montmorillonite (MMT)
  • Nanocomposites
  • Polyamide-6


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