Issue 2, 2011
From the journal:

RSC Advances

Highly efficient polyurethane ionomer corrosion inhibitor: the effect of chain structure

Sitashree Banerjee,a   Abhinay Mishra,b   Madan M. Singh,*a   Biswajit Maiti,c   Biswajit Rayc  and  Pralay Maiti*b  

* Corresponding authors

a Department of Applied Chemistry, Banaras Hindu University, Varanasi, India
E-mail: mmsingh.apc@itbhu.ac.in

b School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi, India
E-mail: pmaiti.mst@itbhu.ac.in
Fax: +91-542 236 8707
Tel: +91-542 236 8707

c Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi, India

Abstract

A series of polyurethane (PU) ionomers with different degree of sulfonation (DS) have been synthesized and successfully used as corrosion inhibitor for mild steel (MS) in acidic medium. Nuclear magnetic resonance (NMR) and Fourier transform infra red (FTIR) spectra of the sulfonated PUs confirmed the sulfonation on the >NH group of the urethane linkage and DS increases with the increase in the ratio of the sulfonating agent and PU. More than 90% inhibition efficiency (IE) of sulfonated polyurethanes (SPU) has been reported using only 20 ppm of the ionomers. These ionomers inhibited the corrosion of MS through adsorption following the Langmuir adsorption isotherm. Surface coverage has been scaled using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The effect of sulfonation on the electronic and chemical structure of PU molecules has also been investigated. Electronic structure calculations have been performed to predict the adsorption behavior of ionomers on the metal surface, and thereby, the relative inhibition has been quantitatively correlated with DS.

Graphical abstract: Highly efficient polyurethane ionomer corrosion inhibitor: the effect of chain structure

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Article information

DOI
https://doi.org/10.1039/C1RA00021G
Article type
Paper
Submitted
08 Apr 2011
Accepted
19 Apr 2011
First published
28 Jul 2011

RSC Adv., 2011,1, 199-210

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Highly efficient polyurethane ionomer corrosion inhibitor: the effect of chain structure

S. Banerjee, A. Mishra, M. M. Singh, B. Maiti, B. Ray and P. Maiti, RSC Adv., 2011, 1, 199 DOI: 10.1039/C1RA00021G

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