Synthesis of a Conductive Copolymer and Phase Diagram of Its Suspension with Single-Walled Carbon Nanotubes by Microfluidic Technology | Zendy

ShengHong Yao | Zendy; Aikaterini Bethani | Zendy; Nadia Ziane | Zendy; Cyril Brochon | Zendy; Guillaume Fleury | Zendy; Georges Hadziioannou | Zendy; Philippe Poulin | Zendy; JeanBaptiste Salmon | Zendy; Éric Cloutet | Zendy

Open Access

Synthesis of a Conductive Copolymer and Phase Diagram of Its Suspension with Single-Walled Carbon Nanotubes by Microfluidic Technology

Author(s) -

ShengHong Yao,

Aikaterini Bethani,

Nadia Ziane,

Cyril Brochon,

Guillaume Fleury,

Georges Hadziioannou,

Philippe Poulin,

JeanBaptiste Salmon,

Éric Cloutet

Publication year - 2015

Publication title -

macromolecules

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.994

H-Index - 313

eISSN - 1520-5835

pISSN - 0024-9297

DOI - 10.1021/acs.macromol.5b01632

Subject(s) - copolymer , materials science , carbon nanotube , chemical engineering , amphiphile , conductivity , polymerization , polymer chemistry , polystyrene , membrane , phase diagram , microfluidics , phase (matter) , nanotechnology , polymer , organic chemistry , composite material , chemistry , biochemistry , engineering

International audienceAmphiphilic block copolymers composed of a poly(3-hexylthiophene) (P3HT) segment and a sulfonated polystyrene (PS-stat-PSS) sequence with well-defined and easily tunable structure were synthesized through Grignard metathesispolymerization (GRIM), RAFT polymerization and sulfonation of PS. Because of the hydrophilic nature and ionic conductivityof the PSS segment, such copolymer shows good solubility in water and high conductivity ∼1 S/m in form of dry film.Conductivity can be further enhanced with the addition of single-walled nanotubes (SWNTs). The present amphiphilic blockcopolymer enables efficient unbundling and stabilization of SWNTs in water. With the help of an original microfluidic techniquereferred to as microf luidic pervaporation, we investigated the concentration process of SWNT/copolymer suspensions up to dry films and obtained a complete phase diagram which reveals the aggregation of SWNTs during the concentration process in a given concentration range. High conductivity of about 370 S/m is achieved for SWNT/copolymer nanocomposites at highconcentration of SWNTs. The microfluidic pervaporation method is also shown to provide a direct determination of the CNT percolation threshold

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