Epoxy Resins Chemical Modification by Dibasic Acids

Abstract

Kinetic regularities of epoxy resins chemical modification by aliphatic and aromatic dibasic acids have been studied. The commercial dianic resins ED-20 and ED-24 were used as epoxy resins. Oxalic, malonic, succinic, sebacic, maleic, terephthalic and isophthalic acids were used as dibasic carboxylic acids. The effective rate constants and activation energies of the reactions between epoxy resin and acids by different nature have been calculated. The synthesis method for oligomers with epoxy and carboxy groups has been suggested. The structure of synthesized oligomers was confirmed by chemical analyses and IR-spectroscopy.

Crosslinking of Epoxy-Oligoesteric Mixtures in the Presence of Dioxydiphenylpropane Diglycidyl Ether Modified With Adipic Acid

“…(2). For the development of DCDER synthesis procedure we used our previous results about chemical modification of epoxides by carbonic acids [6]. BTEACh was used as a catalyst of Eq.…”

“…4. Absorption band at 918 cm -1 (a) and change of its intensity (b) after preparing the mixture III (1), after keeping at room temperature for 24 h (2) and after heating at 383 K for 15 (3); 30 (4); 45 (5); 60 (6) and 75 (7) (1), after keeping at room temperature for 24 h (2) and after heating at 403 K for 15 (3); 30 (4); 45 (5); 60 (6) and 75 (7) min While forming films at room temperature for 24 h (curve 2, Fig. 4) the decrease in band intensity is evident; after heating the band disappears.…”

“…Recently the researches of the Department of Petroleum Chemistry and Technology (Lviv Polytechnic National University, Lviv Ukraine) carried out chemical modification of epoxy resins by unsaturated [6] and saturated acids [7], glycols [8,9], hydroperoxides [10]. The modified epoxy compounds contain free epoxy and other functional groups, namely carboxy, primary hydroxy, peroxy, acrylate fragment.…”

“…In the present work we synthesize the additive with two carboxy groups as distinct from the known compound [6] and study its properties during epoxy-oligoesteric mixtures crosslinking.…”

Investigation of Functional Carboxy-Containing Oligomers by IR and NMR Spectroscopy

“…We have synthesized new oligomers with carboxy, epoxy, secondary hydroxy and peroxy esteric functional groups based on epoxy resins [9][10][11][12][13]. The initial compounds for oligomers synthesis were diglycidyl ether of Bisphenol A (DGEBA), ED-24 and ED-20 dianic epoxy resins, peroxy oligomer (the peroxy derivative of ED-24 epoxy resin), carboxy-containing oligomers based on pyromellitic dianhydride, polyethylene glycol (PEG) and tert-butyl hydroperoxide or 1-butanol, dicarboxylic acids ─ adipic, maleic, terephthalic.…”