title: Solid-state synthesis of poly(3',4'-dimethoxy-2,2':5',2"- terthiophene): comparison with poly(terthiophene) and poly(3',4'-ethylenedioxy-2,2':5',2"- terthiophene).
abstract: A new terthiophene monomer: 3',4'-dimethoxy-2,2':5',2"-terthiophene (TMT) was synthesized and characterized by ¹H-NMR, ¹³C-NMR and FTIR. The solid-state oxidative polymerizations of TMT were performed in various ratios of oxidant (FeCl₃) to monomer (TMT). The resulting polymers were characterized by ¹H-NMR, FTIR, UV-vis-NIR, GPC, X-ray diffraction, CV, as well as TGA and conductivity measurements. The structure and properties of poly (TMT) were compared with those of polyterthiophene [poly(TT)] and poly (3',4'-ethylenedioxy-2,2':5',2"-terthiophene) [poly(TET)] prepared under the same polymerization conditions. After comparative analysis with poly(TT) and poly(TET), the effects of the dimethoxy substituent and FeCl₃ on the structural and physicochemical properties of the poly(TMT)s were discussed in depth. The comparison suggested that the dimethoxy-substituted polymer did not display higher crystallinity, thermal stability, conductivity and electrochemical activity than ethylenedioxy substituted one. The results also showed that the effect of FeCl₃ on poly(TMT) was similar that seen with the poly(TT), in which the oxidation degree, electrochemical activity and conductivity increased steadily with increasing [FeCl₃/[TT] ratio. Furthermore, the poly(TMT) and poly(TT) are mostly made up of dimers with a small amount of higher molecular weight components.
authors: Key Laboratory of Petroleum and Gas Fine Chemicals, Educational Ministry of China, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China.
authors: Tursun
authors: T
authors: Abdiryim
authors: Ruxangul
authors: R
authors: Jamal
authors: Aminam
authors: A
authors: Ubul
authors: Ismayil
authors: I
authors: Nurulla
mesh_terms: D001672:Biocompatible Materials; D010084:Oxidation-Reduction; D011069:Poly I; D011108:Polymers / Q000138:chemical synthesis*; D060327:Solid-Phase Synthesis Techniques; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013876:Thiophenes / Q000138:chemical synthesis / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D011108:Polymers; D013876:Thiophenes; C577060:poly(3',4'-dimethoxy-2,2'-5',2''-terthiophene); C577059:poly(3',4'-ethylenedioxy-2,2'-5',2''-terthiophene); C019101:alpha-terthienyl; D011069:Poly I; C017937:poly If