| 손인식1 · 황버들1 · 전상은1,2,* |
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| 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU)의 탈불화를 이용한
PVDF와 PTFE로부터 메조포러스 탄소의 합성 |
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Received: 17 February 2021; Accepted: 18 March 2021. Published online: 6 April 2021. |
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| ABSTRACT |
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Porous carbon has found commercial applications as a filter material based on the sorption ability
of its pores. The pore size and surface properties of the carbon can be varied depending on the type of particles
to be filtered. Here, mesoporous carbon was induced through the pyrolysis of polyvinylidene fluoride (PVDF)
to fabricate a porous material for microparticle filtration. Because removal of the constituent fluorine at
elevated temperature leaves small-sized micropores, the PVDF precursor mainly generates micropores during
pyrolysis. To suppress the micropore evolution mechanism, the PVDF precursor was defluorinated before the
heat treatment using 1,8-Diazabicyclo[5.4.0]undec-7-ene(DBU) and then pyrolyzed. The suppressed evolution
of the micropores during carbon synthesis leads to a lower specific surface area, suggesting low adsorption
capacity. The polytetrafluoroethylene (PTFE) was mixed with the PVDF precursor to induce mesoporosity. The
PVDF precursor mixed with the PTFE enhanced the surface area since the PTFE could be removed, leaving
mesopores after pyrolysis. The effect of the defluorination process on the porosity was investigated by varying
the ratio of DBU to vinylidene fluoride unit (1, 5, 10, 20) in the precursor solution. With higher DBU content
in the precursor, the micropore evolution was reduced with a lower specific surface area. The porous carbons
synthesized from the precursor with a high DBU amount (DBU/vinylidene fluoride unit = 5, 10, 20) were
almost entirely composed of mesopores. In addition, the higher DBU content reduced the hydrophilicity of the
synthesized carbon. In summary, to separate and absorb relatively large impurities, the mesoporous carbon
should be synthesized using a mixture of PVDF and PTFE precursor with an appropriate amount of DBU for
a higher specific surface area. |
| Keywords:
polyvinylidene Fluoride (PVDF), polytetrafluoroethylene (PTFE), 1, 8-Diazabicyclo[5.4.0]undec-7-ene
(DBU), micropore, mesopore |
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