Methacrylate based side chain liquid crystalline polymers with pendant cholesterol group: Preparation and investigation of electrical conductivity mechanism |
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| Authors: | Erdinc Doganci Cigdem Cakirlar Sumeyra Bayir Faruk Yilmaz Muhammad Yasin |
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| Affiliation: | 1. Department of Chemistry, Gebze Technical University, Kocaeli, Turkey;2. Department of Chemistry and Chemical Processing Tech, Kocaeli University, Kocaeli, Turkey;3. Department of Physics, Gebze Technical University, Kocaeli, Turkey;4. Department of Electrical Engineering, National University of Sciences and Technology, Islamabad, Pakistan |
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| Abstract: | Methacrylate based side‐chain liquid crystalline polymers (SCLCP) bearing cholesterol pendant moieties with various lengths of aliphatic spacer were synthesized and their electrical conductivity mechanism was studied for their possible applications in elastic microelectronic devices. All the polymers exhibited liquid crystalline behavior of broken focal‐conic fan texture of smectic phase. The dielectric properties of polymers were investigated by impedance spectroscopic technique in the frequency range of 100 Hz to 15 MHz at room temperature. Alternating current (AC) conductivity (  ) of the liquid crystalline polymeric films was observed to vary with angular frequency, ω as ωS with s < 2. Detailed conductivity analysis revealed that the conductivity of the polymeric films follows quantum mechanical tunneling and correlated barrier hoping conductivity mechanisms at low frequency regime, whereas it obeys super linear power law and direct current conductivity mechanisms at high frequency region. The investigation of the SCLC polymeric films helped to propose a model system for their possible potential applications. In the light of this study, the SCLC polymers will be employed as the gate insulator for organic field effect transistor applications, such as large area flexible arrays or as other advanced microelectronic devices that have superior performance. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45207. |
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| Keywords: | cholesterol conductivity dielectric constant liquid crystalline methyl methacrylate |
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) of the liquid crystalline polymeric films was observed to vary with angular frequency, ω as ωS with s < 2. Detailed conductivity analysis revealed that the conductivity of the polymeric films follows quantum mechanical tunneling and correlated barrier hoping conductivity mechanisms at low frequency regime, whereas it obeys super linear power law and direct current conductivity mechanisms at high frequency region. The investigation of the SCLC polymeric films helped to propose a model system for their possible potential applications. In the light of this study, the SCLC polymers will be employed as the gate insulator for organic field effect transistor applications, such as large area flexible arrays or as other advanced microelectronic devices that have superior performance. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45207.