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

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.

Study of Prepregs Lifetime Based on Epoxy Resin With Aromatic Amine Hardener

“…The prepregs used in the study have been obtained by impregnating a one-directional carbon woven reinforcing filler 12K-300-230 with an epoxy binder with the following composition: 100 weight parts modified epoxy-diane resin; 20 weight parts aromatic amine hardener 4,4'-diamino diphenyl sulfone, 10 weight parts plasticizer tricresyl phosphate [21][22][23][24].…”

Study on methods to improve the mechanical properties of aramid/epoxy composites

“…Mustafa and Mostovoy used different plasticizers to modify epoxy composites. 10,11 The best combination of compressive strength up to 122 MPa and impact toughness of the resin up to 80.3 kJ/m 2 was achieved with the content of 15% TCP of the plasticizers studied. Jin and others 12 used natural rubber to produce an aramid rubber/ER/AF composite, which gave a clear increase in stress-strain properties and interfacial adhesion between the matrix and fiber of the composite.…”

“…As it is known, the mechanical properties of AF/ERs depend not only on the strength properties of the fibers and matrix, but also on the nature of the fiber surface and the mechanisms of load transfer from matrix to fiber at the interface. 7 Therefore, modern literature reports quite a lot of studies [8][9][10][11] on ways to improve the mechanical characteristics of AF/ERs and currently there is a search for optimal technologies. For example, they can consist of modifying the polymer matrix, various treatments of the fiber reinforcement, combination of reinforcement, etc.…”

Determining the mechanical characteristics of composite materials reinforced with woven preforms

“…The PCM advantage consists in that the material, production technology, and design are created simultaneously [3,4]. This determines high innovation degree at all stages of the PCM life cycle: from obtaining raw materials to designing production and operation of products.…”