Issue 13, 2021

Cationic polyurethane from CO2-polyol as an effective barrier binder for polyaniline-based metal anti-corrosion materials

Abstract

The work discloses the use of CO2 polymer chemistry for the development of a sustainable metal anti-corrosion material. CO2-polyol, a poly(ether carbonate)diol from the telomerization of CO2 and propylene oxide catalyzed by zinc–cobalt double metal cyanide in the presence of a chain transfer agent, was used as a soft segment to prepare a waterborne cationic polyurethane dispersion (CPUD), which showed excellent hydrolysis and oxidation resistance owing to the coexistence of a hydrolysis-resistant ether unit and oxidation-resistant carbonate unit in CO2-polyol. Most importantly, to prepare a neutral CPUD dispersion compatible with an acidic conducting polyaniline, a delicately designed internal emulsifier was fabricated, in which 2,5,18,21-tetramethyl-9,14-dioxa-2,5,18,21-tetraazadocosane-7,16-diol (TDTD), combined with a sufficiently low steric hindrance tertiary amine, was used as the side chain extender (CE), with citric acid as a crosslinker. The internally crosslinked neutral CPUD was demonstrated to be compatible with a waterborne conducting polyaniline (cPANI) dispersion; the composite film obtained from the CPUD and cPANI dispersion showed a significant enhancement in barrier performance to protect against the penetration of corrosive molecules into the metal surface.

Graphical abstract: Cationic polyurethane from CO2-polyol as an effective barrier binder for polyaniline-based metal anti-corrosion materials

Supplementary files

Article information

Article type
Paper
Submitted
26 Dec. 2020
Accepted
22 Febr. 2021
First published
23 Febr. 2021

Polym. Chem., 2021,12, 1950-1956

Cationic polyurethane from CO2-polyol as an effective barrier binder for polyaniline-based metal anti-corrosion materials

C. Zou, Q. Zhou, X. Wang, H. Zhang and F. Wang, Polym. Chem., 2021, 12, 1950 DOI: 10.1039/D0PY01757D

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