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Hydrogen-Bonding-Directed Ordered Assembly of Carboxylated Poly(3-Alkylthiophene)s

Bilger, David W ; Figueroa, Jose A ; Redeker, Neil D ; Sarkar, Amrita ; Stefik, Morgan ; Zhang, Shanju

ACS Omega, 2017, Vol.2(11), p.8526-8535

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  • Título:
    Hydrogen-Bonding-Directed Ordered Assembly of Carboxylated Poly(3-Alkylthiophene)s
  • Autor: Bilger, David W ; Figueroa, Jose A ; Redeker, Neil D ; Sarkar, Amrita ; Stefik, Morgan ; Zhang, Shanju
  • Assuntos: Article
  • É parte de: ACS Omega, 2017, Vol.2(11), p.8526-8535
  • Descrição: Hydrogen-bonding-induced ordered assembly of poly(3-alkylthiophene)s derivatives bearing carboxylic acid groups has been investigated from diluted and concentrated solutions to solid films using ultraviolet–visible absorption spectroscopy, polarized optical microscopy, and four-point probe conductivity measurements. In dilute solutions, the polymer undergoes a spontaneous structural transition from disordered coil-like to ordered rodlike conformations, which is evidenced by time-dependent chromism. Many factors such as alkyl-chain length, types of solvents, and temperature are studied to understand the assembly behavior. Transition kinetics of the assembly process reveals a universal second-order rate law, indicating an intermolecular origin due to hydrogen bonding. When more concentrated, hydrogen bonding drives nematic liquid-crystalline gelation above a critical concentration and the gels are thermally reversible. Under an appropriate balance of mechanical and thermal stresses,...

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