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    Synthesis and electrical characterization of poly[(linoleic acid)-g-(styrene)-g-(?-caprolactone)] graft copolymers as gate insulator for OFET devices
    (Wiley, 2023) Gurel, Murat; Cavus, Fatma Kosovali; Demir, Ahmet; Doganci, Erdinc; Alli, Abdulkadir; Alli, Sema
    This study reports a one-pot process used to synthesize poly[(linoleic acid)-g-(styrene)-g-(epsilon-caprolactone)] (PLina-g-PSt-g-PCL) graft copolymers. The process was carried out by combining the atom transfer radical polymerization of styrene with the ring-opening polymerization of e-caprolactone from polymeric linoleic acid having hydroxyl groups and bromine groups in the main chain. The characterization of the products was achieved using proton nuclear magnetic resonance, size-exclusion chromatography, Fourier transform infrared spectroscopy, thermogravimetric analysis, and differential scanning calorimetry techniques. Subsequently, an organic field effect transistor (OFET) was fabricated with PLina-g-PSt-g-PCL graft copolymers as the insulator layer. Poly(3-hexylthiophene) (P3HT) was used as the active layer and prepatterned OFET substrates were used as the welding/discharge electrodes. To measure capacitance, an ITO/P3HT/PLina-g-PSt-g-PCL/Al structure was prepared using the same method. To obtain output and transfer current-voltage characteristics, electrical characterizations of OFET devices were conducted in darkness and an atmosphere of air. From a capacitance-frequency plot, the key characteristics of the devices, including the threshold voltage (V-Th), field effect mobility, and current on/off ratio (I-on/off), were derived. The fundamental electrical parameters in the fabricated OFET devices based on styrene concentration were thoroughly examined. It was observed that the produced PLina-g-PSt-g-PCL OFETs display positive device characteristics such as low V-Th, exceptional mobility, and I-on/off values. (c) 2023 The Authors. Polymer International published by John Wiley & Sons Ltd on behalf of Society of Industrial Chemistry.