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Investigation of the conditions for the synthesis of poly(3,4-ethylenedioxythiophene) atrp macroinitiator

In the fast growing wearable electronics industry, conductive polymers play a significant role as their properties and structure can easily be customised to the specific application. One of the most commonly used conductive polymers is poly(3, 4-ethylenedioxythiophene) (PEDOT), whose main advantages are good thermal and chemical stability, conjugated backbone, and easy functionalization. The main disadvantage of PEDOT for use as wearable electronics is the lack of stretchable and self-healing properties. To achieve the desired properties, a new thiophene derivative, 2-(tiophen-3-yl) ethyl 2-bromo-2- methylpropanoate (ThBr) is synthesized as monomer precursor for the synthesis of poly(EDOT-co-ThBr) ATRP macroinitiator (Figure 1.). After the synthesis of macroinitiator, new polymers are introduced by atom transfer radical polymerization to obtain different properties. Before this final synthetic step, the conditions for the synthesis of ATRP macroinitiator should be investigated. In this study, 9 new copolymers with different monomer ratios were synthesized to investigate the reactivity of each monomer. The ratios used in the different syntheses were: EDOT:ThBr = 1:0.2, 1:0.4, 1:0.6, 1:0.8, 1:1, 0.8:1, 0.6:1, 0.4:1 and 0.2:1. In addition, with aim to discover the influence of the reaction time on the final properties of the polymer, the 1:1 ratio macroinitiator synthesis was carried out in different durations: 8 h, 16 h, 24 h and 48 h. The obtained products were characterized using different techniques. Nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR) confirmed the desired structures and the difference in monomer ratios obtained in different sintheses.

ATRP macroinitiator ; conductive polymers ; PEDOT ; reactivity ratio

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