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A novel gas sensor from polymer‐grafted carbon black: responsiveness of electric resistance of conducting composite from LDPE and PE‐b‐PEO‐grafted carbon black in various vapors
Author(s) -
Chen Jinhua,
Tsubokawa Norio
Publication year - 2000
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/1099-1581(200003)11:3<101::aid-pat950>3.0.co;2-0
Subject(s) - low density polyethylene , cyclohexane , materials science , carbon black , solvent , composite number , ethylene oxide , polyethylene , electrical resistance and conductance , water vapor , polymer , chemical engineering , composite material , polymer chemistry , organic chemistry , chemistry , copolymer , natural rubber , engineering
Abstract The composite of low‐density polyethylene (LDPE) filled with carbon black (CB) having high dispersibility and stability was successfully obtained by the use of poly(ethylene‐block‐ethylene oxide) (PE‐b‐PEO)‐grafted CB. The response of the electric resistance of the composite against solvent vapors was examined. The electric resistance drastically increased by 10 4 –10 6 times the initial resistance in a nonpolar solvent vapor such as cyclohexane, and carbon tetrachloride vapor at 40 °C and returned immediately to its initial resistance when the composite was transferred to dry air. However, the electric resistance increased only several times in the polar solvent vapor, such as water and alcohol, at the same temperature. The responsiveness of electric resistance is excellently reproducible and is also stable in cyclohexane vapor and dry air. The effect of temperature on the responsiveness against cyclohexane vapor is also discussed. It is concluded that the composite of LDPE filled with PE‐b‐PEO‐grafted CB could be a promising material to use when preparing gas sensors. Copyright © 2000 John Wiley & Sons, Ltd.