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Introduction of molecular scale porosity into semicrystalline polymer thin films using supercritical carbon dioxide

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6 Author(s)
Gin, Peter ; Department of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794-2275, USA ; Asada, Mitsunori ; Endoh, Maya K. ; Gedelian, Cynthia
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We report supercritical carbon dioxide (scCO2) technology used for forming a large degree of molecular scale porosity in semicrystalline polymer thin films. The following three steps were integrated: (i) pre-exposure to an organic solvent which melted crystalline structures but did not cause a decrease in thickness, (ii) scCO2 exposure under the unique conditions where the anomalous absorption of CO2 occurred, and (iii) subsequent quick evaporation of CO2 to preserve the swollen structures. This unified process resulted in homogenous low-density polyphenylene vinylene films (a 15% reduction in density) with the sustained structure for at least 6 months at room temperature.

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Applied Physics Letters  (Volume:94 ,  Issue: 12 )