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Article Citation - WoS: 6Citation - Scopus: 6Electrochemical Copolymerization and Characterization of Dianilines Linked by Polyether Bridge With Aniline(Springer, 2010) Tirkes, Seha; Onal, Ahmet M.Copolymer of aniline and triethylene glycol bis(o-aminophenyl) ether was synthesized by constant potential electrolysis. Cyclic voltammogram of the copolymer films recorded in the monomer-free electrolytic solution revealed that the redox behavior of the films approaches to that of poly(triethylene glycol bis(o-aminophenyl) ether) with increasing amount of triethylene glycol bis(o-aminophenyl) in the feed ratio. Copolymerization was investigated by in situ recording the changes in the electronic absorption spectrum during electrolysis. The free standing copolymer film was characterized utilizing Fourier transform infrared spectrometer, and spectroelectrochemical behavior of the copolymer was investigated via in situ UV-vis spectroscopic technique. Besides the electron spin resonance study of the copolymer film, the different morphologies of the polymers were examined by scanning electron microscopy and the copolymerization was confirmed. The temperature dependence conductivity of the copolymer film was measured by four-probe technique in the temperature range of 100-300 K, and the calculated parameters showed that conduction mechanism fits to variable range hopping.Article Citation - WoS: 21Citation - Scopus: 20Evaluation of flammability, thermal stability and mechanical behavior of expandable graphite-reinforced acrylonitrile-butadiene-styrene terpolymer(Springer, 2022) Cirmad, Hussam; Tirkes, Seha; Tayfun, UmitAcrylonitrile-butadiene-styrene (ABS) terpolymer was loaded with expandable graphite (EG) at four different concentrations of 5%, 10%, 15% and 20% using micro-compounder followed by injection molding process. Mechanical, thermomechanical, thermal, flame retardancy, melt flow and morphological characterizations of composites were done by tensile, hardness and impact tests, dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), melt flow index (MFI) test and scanning electron microscopy (SEM), respectively. According to test results, tensile strength and storage modulus of ABS were improved with the increase in EG content. Storage modulus and glass transition temperature of ABS yielded enhancement with the inclusion of EG. However, percent elongation and impact strength values showed decreasing trend with EG additions. ABS/EG composites gave higher fire performance relative to ABS including enhancement in LOI and reduction in heat release rate. MFI test revealed that incorporation of EG with the lowest amount displayed no dramatic change for MFI value of neat ABS. EG flakes exhibited well-dispersion and exfoliated structure for all of the filling ratios as the SEM microimages of composites were examined. 15% and 20% EG containing ABS composites were remarked as the most suitable candidates among prepared composites. [GRAPHICS] .
