Abstract
Hydrophobic and comparatively thermally-stable poly(3,4-ethylenedioxythiophene), i.e., poly(styrene sulfonate-co-vinyltrimethoxysilane) (PEDOT:P(SS-co-VTMS)) copolymer was successfully synthesized via the introduction of silane coupling agent into the PSS main chain to form P(SS-co-VTMS) copolymers. PSS and P(SS-co-VMTS) copolymers were successfully synthesized via radical solution polymerization, and PEDOT:P(SS-co-VTMS) was synthesized via Fe+-catalyzed oxidative polymerization. The characterization of PEDOT:P(SS-co-VTMS) was performed through an analysis of Fourier transform infrared spectroscopy (FTIR) results, water contact angle and optical images. The electrical properties of conductive PEDOT:P(SS-co-VTMS) thin films were evaluated by studying the influence of the VTMS content on the electrical and physical properties. The conductivity of PEDOT:P(SS-co-VTMS) decreased with an increase in the VTMS content, but was close to that of the PEDOT:PSS, 235.9 S·cm−1. The introduction of VTMS into the PSS copolymer improved the mechanical properties and thermal stability and increased the hydrophobicity. The thermal stability test at a temperature over 240 °C indicated that the sheet resistance of PEDOT:PSS increased by 3,012%. The sheet resistance of PEDOT:P(SS-co-VTMS), on the other hand, only increased by 480%. The stability of PEDOT:P(SS-co-VTMS) was six-times higher than that of the reference PEDOT:PSS.
Highlights
Conductive polymers (CPs) have attracted considerable attention for use in various potential applications, owing to their excellent properties, such as high conductivity, optical and electrical properties and processability
The introduction of polystyrene sulfonic acid (PSS) to solve the main problem of PEDOT, which is its insolubility in water and solvents, limits the applicability, owing to the intrinsic disadvantages of the PSS polymers, such as their low stability in water, chemicals and certain weather conditions
Materials, conductive films were fabricated by spin coating with wt PEDOT:P(SS-co-VTMS)
Summary
Conductive polymers (CPs) have attracted considerable attention for use in various potential applications, owing to their excellent properties, such as high conductivity, optical and electrical properties and processability. The introduction of polystyrene sulfonic acid (PSS) to solve the main problem of PEDOT, which is its insolubility in water and solvents, limits the applicability, owing to the intrinsic disadvantages of the PSS polymers, such as their low stability in water, chemicals and certain weather conditions. Because of the stability problem, the conductivity of PEDOT:PSS films decreases rapidly at high temperatures and/or high humidity [10,11,12]. The introduction of another material, especially an insulating one, into PEDOT:PSS can negatively influence the electrical and physical properties of conducting films and limit and the number of potential applications. The mechanism of the conductivity enhancement added toto enhance the electrical properties. The mechanism ofof the conductivity enhancement added enhance the electrical properties PEDOT:PSSand and materials, conductive films were fabricated by spin coating with wt PEDOT:P(SS-co-VTMS)materials, materials,conductive conductivefilms filmswere werefabricated fabricatedbybyspin spincoating coatingwith with5 5wtwt%
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