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A typical procedure for in situ precipitation is as follows: poly(styrene) (2.0 g) was dissolved in toluene (20 mL) in a weighing bottle and then the gelator (200 mg) was dissolved with heating. The hot homogeneous solutions were allowed to cool to room temperature for 2 h, during which time the gels were formed. Hexane as poor solvent was slowly poured onto the formed toluene gels. Poly(styrene) including the gelators was gradually precipitated with replacement of toluene in the gel with hexane. The supernatant hexane mixed with toluene was renewed several times. After completion of precipitation, white solid was dried in vacuum overnight. Porous poly(styrene) was obtained in a yield of 2.00 g. In order to remove the gelator, the white solid was immersed at 50°C into ethanol (150 mL) overnight. Drying in vacuum after washing with ethanol gave 1.83 g of porous poly(styrene).
This surface area was smaller than that of conventional inorganic porous materials such as molecular sieves and sintered glasses.
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Suzuki, M., Sakakibara, Y., Kobayashi, S. et al. Preparation of Porous Polymers by ”in Situ Precipitation” Using Low Molecular Weight Gelators. Polym J 34, 474–477 (2002). https://doi.org/10.1295/polymj.34.474
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DOI: https://doi.org/10.1295/polymj.34.474