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Abstract <p>Modification of the epoxy diane resin ED-20 with 1.5 wt % copper(II) hydroxide–orthophosphate solutions (4 : 2 : 2) in phosphorous acid and in a mixture H<sub>3</sub>PO<sub>4</sub> : (NH<sub>4</sub>)<sub>2</sub>HPO<sub>4</sub> = 10 : 1 (wt) and curing with triethylenetetramine results in the formation of crystalline phase of different structure and geometry but close chemical composition in the polymer. At the maximum modifier content 8 wt % the synthesized polymers are characterized by oxygen index values of 24.7–25.1 vol %. In addition, these polymers reach the category of resistance to burning PV-0 according to GOST 28157–89 (when the flame source is removed, the standard sample burns not more than 10 s and then independently extinguishes). The elastic modulus and bending breaking stress are 3.9 GPa and 53.3 MPa, respectively. The presence of ammonium hydrophosphate in the formulation leads to a decrease in initial viscosity values down to 48% and an increase in bending strength up to 2.5 times and heat resistance by 20–25°C.</p>

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Modification of Epoxy Resin ED-20 with Copper and Ammonium Phosphates

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • A. A. Lyubibogov,
  • D. A. Khamzina,
  • S. V. Borisov,
  • I. A. Stenina,
  • Yu. M. Evtushenko,
  • M. A. Vaniev,
  • I. A. Novakov

摘要

Abstract

Modification of the epoxy diane resin ED-20 with 1.5 wt % copper(II) hydroxide–orthophosphate solutions (4 : 2 : 2) in phosphorous acid and in a mixture H3PO4 : (NH4)2HPO4 = 10 : 1 (wt) and curing with triethylenetetramine results in the formation of crystalline phase of different structure and geometry but close chemical composition in the polymer. At the maximum modifier content 8 wt % the synthesized polymers are characterized by oxygen index values of 24.7–25.1 vol %. In addition, these polymers reach the category of resistance to burning PV-0 according to GOST 28157–89 (when the flame source is removed, the standard sample burns not more than 10 s and then independently extinguishes). The elastic modulus and bending breaking stress are 3.9 GPa and 53.3 MPa, respectively. The presence of ammonium hydrophosphate in the formulation leads to a decrease in initial viscosity values down to 48% and an increase in bending strength up to 2.5 times and heat resistance by 20–25°C.