Aliphatic chain grafted polypyrrole as a precursor of carbon membrane

[Display omitted] ► The potential of conducting polymer as a carbon membrane precursor was explored. ► Grafting aliphatic chains to polypyrrole assure a defect-free carbon membrane. ► Effects of fabrication details on the porous feature of the carbon membranes. ► Gas permeation testing demonstrates...

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Veröffentlicht in:Journal of membrane science 2011-09, Vol.379 (1), p.353-360
Hauptverfasser: Chen, Xinwei, Hong, Liang, Chen, Xinling, Yeong, Wen Hao Au, Chan, Wan Ki Isabel
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container_end_page 360
container_issue 1
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container_title Journal of membrane science
container_volume 379
creator Chen, Xinwei
Hong, Liang
Chen, Xinling
Yeong, Wen Hao Au
Chan, Wan Ki Isabel
description [Display omitted] ► The potential of conducting polymer as a carbon membrane precursor was explored. ► Grafting aliphatic chains to polypyrrole assure a defect-free carbon membrane. ► Effects of fabrication details on the porous feature of the carbon membranes. ► Gas permeation testing demonstrates realization of a meso-porous carbon matrix. Electrically conducting polymers are generally considered as unsuitable precursor for the synthesis of carbon membrane because defects always emerge in the carbon matrixes generated from the pyrolysis of these polymers. However, the conjugated chain structure of this type of polymers permits a high conversion of carbon to graphenes. We found that grafting of dodecylbenzene sulfonic acid (DBSA) chains to the conjugated backbone of polypyrrole (PPy) can effectively halt mudcracks from developing in the carbon matrix. The DBSA side chains impede strong association of the conjugated PPy molecular segments since the root cause of mudcracks is the stacking of PPy segments. A uniform and microcrack-free carbon membrane (3–5 μm thick) was achieved on a porous ceramic substrate by means of solution casting and carbonizing the cast PPy-DBSA layer. It was verified that the solvent used to formulate the PPy-DBSA solution and the final calcination temperature have significant impact on the porous structure of carbon membrane. Besides transmission electron microscopy examination, gas permeation test also unveils the porous features of the carbon membrane. The prevalent transport phenomenon was Knudsen diffusion, signifying that the carbon matrix is characterized by the meso-porous structure.
doi_str_mv 10.1016/j.memsci.2011.06.007
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Electrically conducting polymers are generally considered as unsuitable precursor for the synthesis of carbon membrane because defects always emerge in the carbon matrixes generated from the pyrolysis of these polymers. However, the conjugated chain structure of this type of polymers permits a high conversion of carbon to graphenes. We found that grafting of dodecylbenzene sulfonic acid (DBSA) chains to the conjugated backbone of polypyrrole (PPy) can effectively halt mudcracks from developing in the carbon matrix. The DBSA side chains impede strong association of the conjugated PPy molecular segments since the root cause of mudcracks is the stacking of PPy segments. A uniform and microcrack-free carbon membrane (3–5 μm thick) was achieved on a porous ceramic substrate by means of solution casting and carbonizing the cast PPy-DBSA layer. It was verified that the solvent used to formulate the PPy-DBSA solution and the final calcination temperature have significant impact on the porous structure of carbon membrane. Besides transmission electron microscopy examination, gas permeation test also unveils the porous features of the carbon membrane. 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Electrically conducting polymers are generally considered as unsuitable precursor for the synthesis of carbon membrane because defects always emerge in the carbon matrixes generated from the pyrolysis of these polymers. However, the conjugated chain structure of this type of polymers permits a high conversion of carbon to graphenes. We found that grafting of dodecylbenzene sulfonic acid (DBSA) chains to the conjugated backbone of polypyrrole (PPy) can effectively halt mudcracks from developing in the carbon matrix. The DBSA side chains impede strong association of the conjugated PPy molecular segments since the root cause of mudcracks is the stacking of PPy segments. A uniform and microcrack-free carbon membrane (3–5 μm thick) was achieved on a porous ceramic substrate by means of solution casting and carbonizing the cast PPy-DBSA layer. 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subjects artificial membranes
Asymmetric structure
carbon
Carbon membrane
Carbonization
ceramics
Chemistry
Colloidal state and disperse state
Conducting polymer
Exact sciences and technology
General and physical chemistry
Membranes
Micropores
polymers
Porous materials
pyrolysis
solvents
sulfonic acid
temperature
transmission electron microscopy
title Aliphatic chain grafted polypyrrole as a precursor of carbon membrane
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