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Formation of Regular Hole Pattern in Polymer Films
Author(s) -
Peng Juan,
Han Yanchun,
Fu Jun,
Yang Yuming,
Li Binyao
Publication year - 2003
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200290068
Subject(s) - hexagonal crystal system , polymer , microporous material , materials science , dispersity , honeycomb , condensation , close packing of equal spheres , polymer chemistry , chemical engineering , crystallography , composite material , chemistry , physics , thermodynamics , engineering
Ordered macroporous materials recently have attracted much attention. A method that utilizes the condensation of monodisperse water droplets on a polymer solution is proposed for the preparation of honeycomb microporous films. Our results show that it is a general method that can be used for patterning a wide range of polymers. The presence of water vapor and polymer is necessary for the formation of regular holes in films. The formation of hexagonal packing instead of other kinds of packing takes place because the hexagonal packing has the lowest free energy. The formation mechanisms of regular hole pattern and imperfections in the hexagonal packing are proposed.Hexagonal hole structures in a PMMA film.