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Synthesis and characterization of novel two‐component conjugated polythiophenes with 3‐octyl and 3‐isooctylthiophene side chains
Author(s) -
Feng Weidong,
Qi Zhengjian,
Sun Yueming
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25751
Subject(s) - thermogravimetric analysis , thiophene , gel permeation chromatography , thermal stability , materials science , photoluminescence , polymer chemistry , conductive polymer , polythiophene , polymer , fourier transform infrared spectroscopy , band gap , solubility , side chain , copolymer , quantum yield , analytical chemistry (journal) , chemical engineering , chemistry , organic chemistry , fluorescence , composite material , optoelectronics , physics , quantum mechanics , engineering
With copolymerization functionalization, a novel solution‐processable polymer, poly{(3‐octylthiophene)‐ co ‐[3‐(2‐ethyl‐1‐hexyl)thiophene]} (P3OTIOT), combining the electrochemical properties of poly(3‐octylthiophene) (P3OT) and poly[3‐(2‐ethyl‐1‐hexyl)thiophene] (P3IOT) was synthesized by the FeCl 3 ‐oxidative approach. The characterization of the polymers included Fourier transform infrared, 1 H‐NMR, gel permeation chromatography, thermogravimetric analysis (TGA), ultraviolet–visible spectroscopy, and photoluminescence (PL). P3OTIOT had excellent solubility in common organic solvents. Investigations of the optical properties showed that the optical band‐gap energy of P3OTIOT was similar to that of P3OT (2.43 eV) at 2.45 eV and 6% lower than that of P3IOT in CHCl 3 solutions. The bandwidth of the P3OTIOT absorption approached that of P3OT, ranging from 370 to 570 nm, and the emission maximum of P3OTIOT was only 50 nm blueshifted with respect to that of P3OT. However, the PL intensity of P3OTIOT was 7 times higher than that of P3OT. TGA studies showed that P3OTIOT had very good thermal stability, losing 5% of its weight on heating to 300°C. It is suggested that P3OTIOT has low band‐gap energy, a high PL quantum yield, and processability. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1169–1175, 2007