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Bifurcated Mechanical Behavior of Deformed Periodic Porous Solids
Author(s) -
Singamaneni Srikanth,
Bertoldi Katia,
Chang Sehoon,
Jang JiHyun,
Young Seth L.,
Thomas Edwin L.,
Boyce Mary C.,
Tsukruk Vladimir V.
Publication year - 2009
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200801675
Subject(s) - materials science , microporous material , porosity , composite material , polymerization , capillary action , porous medium , microstructure , polymer
The transformation of periodic microporous structures fabricated by interference lithography followed by their freezing below glass transition is described. Periodic porous microstructures subjected to internal compressive stresses can undergo sudden structural transformation at a critical strain. The pattern transformation of collapsed pores is caused by the stresses originated during the polymerization of acrylic acid (rubbery component) inside of cylindrical pores and the subsequent solvent evaporation in the organized microporous structure. By confining the polymerization of acrylic acid to localized porous areas complex microscopic periodic structures can be obtained. The control over the mechanical instabilities in periodic porous solids at a sub‐micron scale demonstrated here suggests the potential mechanical tunability of photonic, transport, adhesive, and phononic properties of such periodic porous solids.