Study on the effect of plasticizers and thermoplastics on the strength and toughness of epoxy resins

Laura Mustafa, M. B. Ismailov, А.Ф. Санін

2020

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DOI 10.33271/nvngu/2020-4/063
Data confidence 70 medium
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Abstract

stuDy on the effect of plAstIcIZers AnD therMoplAstIcs on the strenGth AnD touGhness of epoxy resIns purpose.To increase the strength and toughness of epoxy resins of "cold hardening" and "hot hardening" by using modified plasticizers and thermoplastic polymers.Methodology.Epoxy resins of "cold hardening" of ED20 and "hot hardening" of Etal InjectT, modified with three types of plasticizers and four types of thermoplastic polymers, were investigated .The toughness and compressive strength of unmodified and modified resins were determined with the help of the Charpy impact test at various modifier contents.findings.Among all studied plasticizers, tricresyl phosphate has the most significant effect on the strength and toughness of both types of resins.The best combination of strength and toughness of ED20 resin is obtained with 5 % tricresyl phosphate con tent, whereas its higher content reduces the strength of the material.For Etal InjectT, high values of these properties are obtained with 15 % tricresyl phosphate content, whereas adding a smaller amount of a modifier does not change the material strength.The modification with thermoplastic polymers has a less obvious effect on the properties of epoxy resins than the modification with plasticizers does.The most effective additives to ED20 are hightemperature polycarbonate (5 %) and polysulfone (10 and 15 %), the addition of which causes a simultaneous increase in both properties.A significant increase in the toughness of Etal InjectT is observed by adding 5-15 % polycarbonate, but the strength of the resin hardly changes.The complex modification of resins with a mixture of plasticizer and thermoplastic leads to a decrease in the toughness and compressive strength of both types of resins.originality.When the polymer mixture hardens, plasticizer molecules dispersed into the environment of epoxy macromole cules weaken the rigid spatial crosslinking of macromolecules and make them more active.As a result, toughness increases; in certain cases so does resistance due to directed reorientation of macromolecules under deformation.The change in mechanical properties of epoxy resin when modified with thermoplastics is defined by the bonding strength of the resin and dispersed particles of thermoplastic polymer as well as by the degree of heterophase of the produced mixture.practical value.The results of changing the mechanical properties of epoxy resin while being modified with plasticizers and thermoplastics can be used to produce impactresistant composite materials for structural purposes, including those for aviation and spacerocket technology.