Abstract
AbstractA method of synthesis of liquid high‐molecular‐weight epoxy resins from modified vegetable oils as natural raw materials is proposed. The possibility of application of epoxidized soybean, rapeseed, linseed, and sunflower oils as well as hydroxylated soybean and rapeseed oils as raw materials in the fusion process was verified. Reactions of: (i) epoxidized oils, used as low‐molecular‐weight epoxy resins, with Bisphenol A, as well as, (ii) Bisphenol A‐based epoxy resin with hydroxylated natural oils, were carried out in the presence of different catalysts (i.e., LiCl, 2‐methylimidazole, triphenylphosphine, and triethanolamine) in the temperature range of 130–160°C (depending on the catalyst type), and under nitrogen for minimization of the oxidative degradation. The epoxy value, color, number/weight‐average molecular weight, and polydispersity of the products obtained were studied in relation to the reaction conditions. Finally, the possibility of curing of the increased‐molecular‐weight epoxy resins, synthesized from the modified natural oils, with 2‐methylimidazole, dicyanodiamide, hexahydrophthalic anhydride, and triethylenetetramine was checked. The results of this research should enable reducing the use of petrochemical raw materials for the syntheses of high‐molecular‐weight epoxy resins. Copyright © 2008 John Wiley & Sons, Ltd.
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