Electric conductivity of siliconorganic polyhomoconjugated polymer films upon adsorption of volatile organic compounds |
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Authors: | A S Komolov N B Gerasimova E F Lazneva A A Gusarov A Yu Osadchev and V V Shamanin |
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Institution: | (1) Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic;(2) Center for Cell Therapy and Tissue Repair, Charles University, 150 06 Prague 5, Czech Republic;(3) Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, 142 20 Prague 4, Czech Republic |
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Abstract: | The electrophysical parameters of polyhomoconjugated organosilicon polymer films are studied, and variation of their conductivity
under the action of water, toluene, and ammonia vapors is measured. Films 1–2 μm thick are prepared by the casting method
from a solution of poly2,2-dimethyl-2-sila-1,3-propylene-(4, 4′-biphenylene)]a (polymer I) and poly2-n -butyl-2-phenyl-2-sila-1,3-propylene-(4, 4′-biphenylene)]a (polymer II). In the course of conductivity measurement, organic
volatiles and water are adsorbed due to a stepwise rise in the pressure over the sample from 10−3 to 10−1 Torr. The initial values of the resistivity of polymers I and II are estimated as 4 × 109 Θ cm. Exposure of the films to organic volatile vapors and water vapor causes a reversible change in the conductivity of
the films. For polymer-I films, the conductivity upon adsorption of ammonia, toluene, and water vapors exceeds the initial
value by 150, 10, and 600 times, respectively. The sensitivity of polymer-II films is lower by a factor of 1.5–2.0. The time
of conductivity variation as the vapors are injected and evacuated is within 10 and 30 s, respectively. The mechanisms of
organic volatile and water adsorption on the surface of polyhomoconjugated organosilicon polymer films are compared with adsorption
mechanisms on the surface of π-polyconjugated organic films. |
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