Three-dimensional pore connectivity in bi-axially stretched microporous composite membranes

D. L. Green, L. McAmish, A. V. McCormick

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26 Scopus citations


Confocal laser scanning microscopy (CLSM) and three-dimensional (3D) image reconstruction were used to visualize the interconnecting pores that result from the bi-axial stretching of CaCO3/polyolefin composite membranes. The following three effects on pore connectivity were examined: (1) amount of membrane stretching-unstretched, low-stretched, and overstretched; (2) polymer matrices-polyethylene and polypropylene; (3) particle coatings-uncoated CaCO3 (calcite) and stearic acid coated calcite. The porosity of the membranes increased with quantifiable increases in their elongation. The pattern of the interconnecting pores depended on the polymer matrix and the particulate coating, where the change in the pattern was related to the stiffness of the composite material and the nature of the interaction at the polymer/calcite interface.

Original languageEnglish (US)
Pages (from-to)100-110
Number of pages11
JournalJournal of Membrane Science
Issue number1-2
StatePublished - Aug 1 2006


  • Breathable films
  • Calcite
  • Confocal laser scanning microscopy (CLSM)
  • Isotatic polypropylene
  • Linear low-density polyethylene
  • Microporous composite membranes
  • Three-dimensional (3D) porosity and pore connectivity


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