Effect of Unsymmetrically Branched Alkyl Chains on the Electrochemical Band Gap and Thermal Stability of the PCDTBT

Shu Er Tan, Farah Hannan Anuar, Sarkar, Rahman, Mohd Sani Sarjadi

Research output: Contribution to journalArticle

Abstract

This work introduces a modified poly[N-9’-heptadecanyl-2,7-carbazole-alt-5,5-(4’,7’-di-2-thienyl-2’,1’,3’-benzothiadiazole)] (PCDTBT) with the unsymmetrically branched N-alkyl chain, which name as poly[N-9’-(2-hexyldecyl)-2,7-carbazole-alt-5,5-(4’,7’-di-2-thienyl-2’,1’,3’-benzothiadiazole)] (P1). The synthesis of P1 involves dimerization, cyclization, tosylation, N-alkylation, bromination, Stille's and Suzuki's coupling reactions. Suitable analysis techniques have used to study the chemical, physical, electrochemical, optical, and thermal properties of P1. The analysis results show that P1 possesses higher HOMO and LUMO energy levels than the previously reported PCDTBT, which have been narrowing the electrochemical band gap down to 1.58 eV. However, the P1 experiences 5% thermal degradation at 280 °C, which is relatively less favourable than the PCDTBT. Hence, the replacement of the symmetrically branched alkyl chains of PCDTBT with unsymmetrically branched alkyl chains results in both improvement and drawback on the characteristics of the polymer.

Original languageEnglish
Pages (from-to)936-940
Number of pages5
JournalChemistrySelect
Volume4
Issue number3
DOIs
Publication statusPublished - 23 Jan 2019

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Energy gap
Thermodynamic stability
Dimerization
Cyclization
Alkylation
Electrochemical properties
Chemical properties
Electron energy levels
Polymers
Pyrolysis
Thermodynamic properties
Optical properties
Physical properties
poly(N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)
benzo-1,2,3-thiadiazole
carbazole

Keywords

  • Alkylation
  • bond energy
  • cyclic voltammetry
  • electrochemistry
  • polymerization

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Effect of Unsymmetrically Branched Alkyl Chains on the Electrochemical Band Gap and Thermal Stability of the PCDTBT. / Tan, Shu Er; Anuar, Farah Hannan; Sarkar; Rahman; Sarjadi, Mohd Sani.

In: ChemistrySelect, Vol. 4, No. 3, 23.01.2019, p. 936-940.

Research output: Contribution to journalArticle

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