Unlocking efficiency: Imidazole-nitrile based catalyst as latent thermal curative for improved epoxy resin curing and exploring mechanical behavior

Mohamed Mydeen, K and BalajI, K and Sasikumar, R and Alagar, M (2025) Unlocking efficiency: Imidazole-nitrile based catalyst as latent thermal curative for improved epoxy resin curing and exploring mechanical behavior. High Performance Polymers. ISSN 0954-0083

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Abstract

The imidazole core-based cyano-derivative (TDMN) was successfully synthesized through the reaction of terephthaldehyde and diaminomaleonitrile in absence of any catalysts with 86% yield. The product resulted was characterized for its molecular structure and cure behavior. TDMN was used for the curing of diglycidyl ether of bisphenol-A epoxy resin (E) with different amine curatives, including 4,4′-diaminodiphenylmethane (ddm), 4,4′-diaminodiphenylether (dde), 4,4′-diaminodiphenylsulfone (dds), dicyandiamide (dicy) and melamine (M). With a notable storage stability of 90 days, E-amines with TDMN proved strong and efficient. The curing temperatures were found to be 75°C, 120°C, 150°C, 150°C and 180°C for ddm, dde, dds, dicy and m based one-pack latent E-amines with TDMN, respectively. The activation energy (E a ) of E-M + TDMN has calculated using Kissinger and Ozawa methods and found that 80.14 kJ mol −1 and 79.74 kJ mol −1 respectively. Tensile specimens and bio-carbon briquettes fabricated using E-amines with TDMN catalyst exhibited enhanced tensile and compressive strength compared to neat E-amine systems. This study represents a pioneering development in latent thermal initiator technology for epoxy curing, with promising applications in composite fabrication and energy efficiency.

Item Type: Article
Uncontrolled Keywords: Latent thermal curing agent, imidazole core nitrile catalyst, one pack latent-epoxy resin, tensile strength and compressive strength
Subjects: F Mechanical Engineering > Tensile testing
G Chemistry > Epoxy compounds
Divisions: Chemistry
Depositing User: Dr Krishnamurthy V
Date Deposited: 12 Mar 2025 05:26
Last Modified: 12 Mar 2025 05:26
URI: https://ir.psgitech.ac.in/id/eprint/1379

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