LEE- Kimya Lisansüstü Programı
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ÖgeSynthesis and characterization of a novel polymerizable deep eutectic solvent(Graduate School, 2024-12-24) Akansel, Yağmur ; Karagöz, Bünyamin ; 509211278 ; ChemistryPolymerizable deep eutectic solvents are becoming increasingly popular in sustainable materials research. They are highly customizable and can be synthesized using eco-friendly methods. In this study, a polymerizable deep eutectic solvent (PDES) was prepared using acryloxyethyltrimethyl ammonium chloride (AETMAC), a novel chemical in DES synthesis, Cetyltrimethylammonium Chloride (CTAC), Tetrabutylammonium Bromide (TBAB) as hydrogen bond acceptors, and Acrylic Acid (AA) as a hydrogen bond donor. Two types of DESs were obtained and used to fabricate ionic conductive elastomers (ICEs) via the photopolymerization of AA and AETMAC. To control the rapid and exothermic reaction during photopolymerization, CTAC and TBAB were added as additional proton acceptors to the AETMAC. The addition of CTAC and TBAB improved the reaction rate and stability of the polymerization process. The photopolymerization reaction was carried out under sunlight, and a hard and brittle polymer structure was achieved in seconds. The resulting ICEs were characterized using various techniques. The AETMAC and CTAC were initially obtained in a water mixture and dried using a freeze-dryer technique. Different molar ratios of hydrogen bond donors and acceptors were theoretically and experimentally investigated to find the optimum ratio to attain the clearest solution. Fourier transform infrared spectroscopy (FTIR) analysis confirmed the occurrence of hydrogen bonding by the band originally at 1695 cm⁻¹ for the carboxylic group of acrylic acid shifting to 1719 cm⁻¹. Generally, the melting point (Tm) of a deep eutectic solvent is lower than that of any of the single components. Therefore, the melting point of the resulting DESs was measured with differential scanning calorimetry (DSC), and the results provided clear evidence of the formation of DESs. The Tm values of the CTAC-AETMAC and TBAB-AETMAC type DESs were found to be way lower than expected, indicating the formation of a strong hydrogen bond network in the range of -10 to 0℃ (Tm TBAB: 103℃, Tm CTAC: 237 ℃, Tm AA: 13.5 ℃, and Tm AETMAC:156 ℃). Additionally, a simple electrical circuit was designed to demonstrate the electrical conductivity of the ionic conductive elastomers. Conductivity values measured using the four-point probe method ranged from 1 to 3 × 10-3 S/cm, placing them at the lower end of the conductive polymer spectrum, yet still indicating promising potential.The 1H NMR spectrum further verifies that the polymerization is successful as the peaks at 5,5 and 6,5, corresponding to the C-C double bond, disappear. Furthermore, in the FTIR spectra of PDESs, the band initially seen at 1617 cm⁻¹, which corresponds to the C=C absorption band, disappears, signifying the successful polymerization. To sum up, Polymerisable Deep Eutectic Solvents (PDES) are a versatile class of solvents that are used in everything from the synthesis of polymers to the creation of nanoparticles. Their capacity to undergo polymerization while acting as reaction media has several benefits for sustainability, material design, and process control. Continued research and exploration of PDES are expected to yield further insights into their potential applications and expand their utility in diverse fields. Moreover, this study presents a novel approach to fabricating ICEs using AETMAC-based PDESs. The use of AETMAC PDES synthesis opens up new possibilities for the development of functional materials with tailored properties for a wide range of applications.