Synthesis and characterization of isophorondiamine-based oligoamides: catalytic effect of amides during the curing of epoxy resins

Abstract

The aminolysis products of PET could be applied in several fields. The purpose of this study was to explore their use as a dual-purpose component as cross-linkers and catalysts in epoxy curing. PET aminolysis was carried out with 1:1.5 and 1:2 PET/amine ratios to produce amides with different molecular weights. The reaction products were characterized with functional group analysis, NMR, FTIR, MALDI-TOF, and solution viscosimetry. The terephthalamides were dissolved in isophorondiamine and used as cross-linkers. Reaction kinetics studies with DSC, viscosimetry, and quantum chemical computational methods were used to characterize their accelerative effects. Our studies have shown that terephthalamides are active catalyst and their efficiency can be tuned with their molecular weight. The quantum chemical simulations suggested that the terephthalamides are in the same order of magnitude in effectiveness as phenolic accelerators. Consequently, terephthalamides are valued materials that can serve as double-purpose components in epoxy curing.

Marine Environmental Plastic Pollution: Mitigation by Microorganism Degradation and Recycling Valorization

“…The products of PET aminolysis are used to produce, for example, polyurethanes (PU) (Shamsi et al, 2009;Sadeghi et al, 2011) or other polyesters (Musale and Shukla, 2016), employing catalysts, such as organic catalysts, amides, sodium acetate, or potassium sulfate. This variety of end products widens the potential use range for aminolysis (Sinha et al, 2010;George and Kurian, 2016;Kárpáti et al, 2019).…”

Room temperature curable inorganic–organic hybrid nanocomposite hydrophobic coating: mechanistic understanding of the role of Ti(iv) and the diamine based curing agent

“…The nucleophilic amine group attacks the less steric carbon epoxy ring of C-O-C to open the ring and the electron from O À is shared with H + to form a -OH bond which helps to react with the other nucleophilic part of the polymeric sol. 30,[32][33][34] Polydimethyl siloxane (PDMS), trimethyl-siloxy terminated, is used in the system to develop the hydrophobic nature of the hybrid coating due to two organic -CH 3 side groups attached to the silicon atom and the large bond energy of 452 kJ mol À1 , rendering excellent chemical durability, abrasion resistance, adherence properties, etc. 35,36 Development of RT curable hard hydrophobic coatings by sol-gel has technological importance for different applications.…”