Preprint Article Version 1 This version is not peer-reviewed

Design of a pH-responsive Conductive Nanocomposite Based on MWCNTs Stabilized in Water by Amphiphilic Block Copolymers

Version 1 : Received: 9 August 2019 / Approved: 12 August 2019 / Online: 12 August 2019 (12:28:23 CEST)

How to cite: den Hoed, F.; Pucci, A.; Picchioni, F.; Raffa, P. Design of a pH-responsive Conductive Nanocomposite Based on MWCNTs Stabilized in Water by Amphiphilic Block Copolymers. Preprints 2019, 2019080142 (doi: 10.20944/preprints201908.0142.v1). den Hoed, F.; Pucci, A.; Picchioni, F.; Raffa, P. Design of a pH-responsive Conductive Nanocomposite Based on MWCNTs Stabilized in Water by Amphiphilic Block Copolymers. Preprints 2019, 2019080142 (doi: 10.20944/preprints201908.0142.v1).

Abstract

Homogeneous water dispersions of MWCNTs were prepared by ultrasonication in the presence of an amphiphilic polystyrene-block-poly(acrylic acid) (PS-b-PAA) copolymer. The ability of PS-b-PAA to disperse and stabilize MWCTNs was investigated by UV-vis, SEM and zeta potential. It is shown that the copolymer can disperse nanotubes directly by sonication in water. The results show that the addition of a styrene block to PAA enhances the dispersion efficiency compared to pure PAA, possibly due to the nanotube affinity with the polystyrene moiety. Notably, the dispersions show an evident pH-responsive behavior, being MWCNTs reaggregation promoted in basic environment. Furthermore, composites obtained by drop casting display electrical conductivity responsive to pH variations, showing the potential of such materials for sensing applications.

Subject Areas

amphiphilic block copolymers; carbon nanotubes; stimuli responsive; conductive composite

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