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

Year 2019, Volume: 14 Issue: 1, 62 - 70, 31.05.2019

Emine Gül Cansu Ergün

https://doi.org/10.29233/sdufeffd.499258

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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