2014

Fluoren ve Pirol İçeren Kopolimerler: Kopolimer Besleme Oranının Elektrokimyasal ve Elektrokromik Özellikler Üzerine Etkisi

Bu çalışmada, poli-2,2′-(9,9-dioktil-9h-fluoren-2,7-diyl)bistiyofen (PBT) ve poli-pirol-3-karboksilik asit (PP3CA) olarak adlandırılan iki polimerin ve ayrıca fluoren ve pirol gruplarını içeren 5 tane yeni kopolimerin (CoP1, CoP2, CoP3, CoP4, CoP5) sentezi elektrokimyasal yöntemlerle gerçekleştirilmiştir. Kopolimer çözeltileri BT ve P3CA monomerlerinin farklı besleme oranlarında karışımı ile hazırlanarak, monomer besleme oranının kopolimerin elektrokimyasal ve elektrokromik özellikleri üzerine etkisi incelenmiştir. Elektrokimyasal polimer sentezlerinin ardından tüm homopolimer ve kopolimerlerin elektrokimyasal, elektrokromik ve kolorimetrik çalışmaları yapılmıştır. Literatürde P3CA monomerinin elektrokromik çalışmalarının az olması nedeniyle, bu yapı BT monomeri ile beraber kopolimer zincirine katılmıştır. Kopolimerler içinde, 1:1 (BT: P3CA) monomer besleme oranı ile hazırlanan CoP1 kopolimeri, PP3CA homopolimeri ile kıyaslandığında daha düşük bant aralığı ve multikromik özellikler göstermiştir.

Novel Fluorene and Pyrrole Comprising Copolymers: Effect of Copolymer Feed Ratio on Electrochromic and Electrochemical Properties

Herein, synthesis of two homopolymers namely, poly-2,2′-(9,9-dioctyl-9h-fluorene-2,7-diyl)bisthiophene (PBT), poly-pyrrole-3-carboxylic acid (PP3CA) and fluorene and pyrrole comprising five novel copolymers (CoP1, CoP2, CoP3, CoP4, CoP5) were electrochemically synthesized. Each electrolytic solution was prepared with different monomer feed ratios to investigate the effect of comonomer ratio on electrochromic and electrochemical properties. After synthesis, homopolymers and copolymers were compared in terms of their electrochemical, spectroelectrochemical and colorimetry properties. The number of studies on electrochromic characterization of pristine P3CA group was limited in literature, hence in this study P3CA was electrochemically inserted into the polymer chain via copolymerization.CoP1 with 1:1 (BT: P3CA) monomer feed ratio exhibited the lower optical band gap and red shifted neutral state absorption compared to PP3CA, additionally light yellow color of PP3CA turned out to be multichromic for CoP1with the insertion of BT unit via electrocopolymerization.

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