Cross-linking of Epoxy-Oligoesteric Mixtures in the Presence of Fluorine-Containing Epoxy Resins

Abstract

Cross-linking of epoxy-oligomeric mixtures based on ED-20 industrial epoxy dianic resin and TGM-3 oligoesteracrylate in the presence of fluorine-containing peroxy oligomers has been studied. Oligomers used for the cross-linking have been obtained via chemical modification of peroxy derivative of ED-24 epoxy resin with alcoholstelomers by general formula HOCH 2 -(CF 2 -CF 2 ) n H, where n is 3 or 4. The thermal stability of peroxy groups in the initial material, fluorine-containing peroxy oligomers and stability of cross-linked films have been examined using derivatographic methods. The effect of temperature, process time and mixture composition on the gel-fraction content and hardness of obtained films has been established.

Synthesis and Properties of Carboxy-Containing Peroxy Oligomer

“…in the cross-linked samples (Table 4). The higher cross-linking temperature, the higher interaction with carboxy groups according to the reactions (6) At the same time in spite of the intensity decrease of the absorption band for carboxy group in the acids (Fig. 9) we do not observe the intensive decrease of a.n.…”

“…The proceeding of the reaction (7) with separation of water molecules, as well as decomposition of CPO molecules followed by acetone and tert-butyl alcohol formation develops the nonuniform surface (as it was above mentioned, Table 3) with great amount of CPO in the mixture. The interaction between hydroxy, epoxy and carboxy groups in accordance with the reactions (6) and 7decreases a.n. in the cross-linked samples (Table 4).…”

“…Hence partial decomposition of CPO peroxy groups occurs which causes three-dimensional copolymerization of TGM-3 molecules. Moreover, partial interaction with CPO carboxy groups by the reactions (6) and 7also takes place. Tertiary amine formed in accordane with the reaction (5) is the catalyst for the reactions (6) and (7).…”

“…Moreover, partial interaction with CPO carboxy groups by the reactions (6) and 7also takes place. Tertiary amine formed in accordane with the reaction (5) is the catalyst for the reactions (6) and (7). The mixture heating to 383 K and higher temperatures accelerates the above-mentioned reactions, namely (6) and (7).…”

“…Literature data describe PO containing -O-O-bond in their structure, as well as epoxy and hydroxy groups [2], fluorine-containing and hydroxy groups [6] and others [4].…”