Synthesis and Characterization of an Electrochromic Copolymer Film Bearing Two Different Donor-Acceptor-Donor Type Electrochromes

Abstract

Two donor-acceptor-donor type monomers (EC and TB) were selected to grow a copolymer via electrochemical techniques. EC monomer contains 3,4-ethylenedioxythiophene as the donor and carbazole as the acceptor units, while TB monomer includes thiophene and benzothiadiazole as the donor and the acceptor, respectively. The resulting copolymer film was investigated in terms of its electrochemical and optical properties and compared with the homopolymers of EC and TB. The copolymer film exhibited different electrochromic properties from their corresponding homopolymers. The neutral state faded-orange color of the polymer of EC and magenta color of the polymer of TB possesed a brownish color of the copolymer in the neutral state, with having a broader absorption band in the visible region by covering the characteristic absorption bands coming from both homopolymers. The physico-chemical properties, energy gaps, optical contrasts and coloring efficiencies for the homopolymers and for copolymer were systematically studied. 

Keywords

• Electrochromic polymer,Electropolymerization,Copolymerization

İki Farklı Elektron Verici-Alıcı-Verici Tip Elektrokrom İçeren Bir Elektrokromik Kopolimerin Sentezi ve Karakterizasyonu

Abstract

İki farklı elektron verici-alıcı-verici tip monomer (EC ve TB) kullanılarak, elektroanalitik yöntemler ile elektrokromik bir kopolimer sentezlenmiştir. EC monomeri, elektron verici grup olarak 3,4-etilendiyoksitiyofen ve elektron alıcı grup olarak karbazole içerirken, TB monomeri elektron verici ve alıcı olarak sırasıyla tiyofen ve benzotiyadiyazol birimleri içermektedir. Elde edilen kopolimer, elektrokimyasal ve optiksel özellikleri bakımından incelenmiş ve bu özellikler EC ve TB homopolimerleri ile karşılaştırılmıştır. Kopolimer film, ilgili homopolimerlerden farklı özellikler göstermiştir.  Nötral halde soluk turuncu olan EC polimeri ile morumsu renkteki TB polimeri, kopolimere dönüştüğünde iki polimerden gelen daha geniş bir bant aralığını kapatarak kahverengine dönüşmüştür. Homopolimerler ve kopolimerin fiziko-kimyasal özellikleri, enerji aralıkları, optik zıtlıkları ve renklenme verimleri sistematik olarak incelenmiştir. 

Keywords

• Electrochromic polymer,Electropolymerization,copolymerization

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