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Synthesis, characterisation, curing reaction of aniline acetaldehyde condensate with epoxy resin

Tithi Maity (Department of Chemistry, Mugberia Gangadhar Mahavidyalaya, Contai, India)
Bidhan Samanta (Department of Chemistry, Mugberia Gangadhar Mahavidyalaya, Contai, India)
Ajit Banthia (Speciality Polymer Lab, Materials Science Centre, Indian Institute of Technology, Kharagpur, India)
Sudipta Dalai (Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore, India)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 13 September 2011

Abstract

Purpose

The purpose of this paper is to find a new curing agent for diglycidyl ether of bisphenol A (DGEBA) resin and to check effectiveness of this new curing agent to obtain toughness and chemical resistance of cured epoxy.

Design/methodology/approach

For this purpose, an investigation was carried out to synthesise, characterise and to study curing reaction of amine functional aniline acetaldehyde condensate (AFAAC) with DGEBA resin. AFAAC was first synthesised from the reaction of aniline and acetaldehyde in acid medium and characterised by FT‐IR, 1H‐NMR spectroscopic analyses, elemental analysis, concentration of primary and secondary amine analysis. Then equimolecular mixture of AFAAC and DGEBA was subjected to curing reaction and the reaction was followed by differential scanning calorimetry (DSC) analysis. The kinetic studies of this curing reaction, mechanical properties, dynamic mechanical analysis and thermogravimetric analysis (TGA) of cured epoxy were also reported.

Findings

The DSC analysis showed the complete exotherms of effective curing reaction indicating the efficiency of AFAAC as curing agent for DGEBA resin. The kinetic studies revealed that the curing reaction was first order. Mechanical properties reflect the better fracture properties of cured matrix and TGA showed that the cured matrixes were stable up to around 238°C.

Research limitations/implications

The curing agent AFAAC has been synthesised by using aniline and acetaldehyde. By changing amine and aldehyde, other curing agents could be synthesised and the curing efficiency of these for epoxy resin could also be studied.

Originality/value

The method for curing study of epoxy resin (DGEBA) is novel and relevant as the cured products have high‐performance applications in protective coatings, adhesives for most substrates.

Keywords

Citation

Maity, T., Samanta, B., Banthia, A. and Dalai, S. (2011), "Synthesis, characterisation, curing reaction of aniline acetaldehyde condensate with epoxy resin", Pigment & Resin Technology, Vol. 40 No. 5, pp. 285-291. https://doi.org/10.1108/03699421111176180

Publisher

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Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited