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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2018.28.4.221

Gas Separation Properties of Microporous Carbon Membranes Containing Mesopores  

Shin, Jae Eun (Department of Energy Engineering, Hanyang University)
Park, Ho Bum (Department of Energy Engineering, Hanyang University)
Publication Information
Membrane Journal / v.28, no.4, 2018 , pp. 221-232 More about this Journal
Abstract
The silica containing carbon ($C-SiO_2$) membranes were fabricated using poly(imide siloxane)(Si-PI) and polyvinylpyrrolidone (PVP) blended polymer. The characteristics of porous carbon structures prepared by the pyrolysis of polymer blends were related with the micro-phase separation behaviors of the two polymers. The glass transition temperatures ($T_g$) of the mixed polymer blends of Si-PI and PVP were observed with a single $T_g$ using differential scanning calorimetry. Furthermore, the nitrogen adsorption isotherms of the $C-SiO_2$ membranes were investigated to define the characteristics of porous carbon structures. The $C-SiO_2$ membranes derived from Si-PI/PVP showed the type IV isotherm and possessed the hysteresis loop, which was associated with the mesoporous carbon structures. For the molecular sieving probe, the $C-SiO_2$ membranes were prepared with the ratio of Si-PI/PVP and the pyrolysis conditions, such as the pyrolysis temperature and the isothermal times. Consequently, the $C-SiO_2$ membranes prepared by the pyrolysis of Si-PI/PVP at $550^{\circ}C$ with the isothermal time of 120 min showed the $O_2$ permeability of 820 Barrer ($1{\times}10^{-10}cm^3(STP)cm/cm^2{\cdot}s{\cdot}cmHg$) and $O_2/N_2$ selectivity of 14.
Keywords
Carbon-silica membrane; Gas separation; Carbon; Polyvinylpyrrolidone; Poly(imide siloxane);
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