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  • Title: Fabrication of macroporous films with closed honeycomb-like pores from exponentially growing layer-by-layer assembled polyelectrolyte multilayers.
    Author: Chen X, Sun J.
    Journal: Chem Asian J; 2014 Aug; 9(8):2063-7. PubMed ID: 24757040.
    Abstract:
    We report an innovative method for the fabrication of macroporous films with closed honeycomb-like pores of several micrometers by post-treatment of micrometer-thick poly(acrylic acid) (PAA)/poly(allylamine hydrochloride) (PAH) films. The precursor PAA/PAH films are fabricated by exponential layer-by-layer assembly of PAA and PAH, which produces PAA/PAH films with highly interpenetrated structures. We disclose that the high mobility of PAA and PAH, which originates from the highly interpenetrated film structures, allows a large-scale phase separation to take place upon post-treatment to produce micrometer-sized honeycomb pores. These macroporous PAA/PAH films can be conveniently released from substrates to produce free-standing films with satisfactory mechanical stability.
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