Abstract
The aim of this paper is to study the effect of a polyfunctional modifier oligo (resorcinol phenyl phosphate) with terminal phenyl groups and a dispersed mineral filler, diorite, on the physicochemical and deformation-strength properties of epoxy-based composites. The efficiency of using diorite as an active filler of an epoxy polymer, ensuring an increase in strength and a change in the physicochemical properties of epoxy composites, has been proven. We selected the optimal content of diorite both as a structuring additive and as a filler in the composition of the epoxy composite (0.1 and 50 parts by mass), at which diorite reinforces the epoxy composite. It has been found that the addition of diorite into the epoxy composite results in an increase in the Vicat heat resistance from 132 to 140–188 °C and increases the thermal stability of the epoxy composite, which is observed in a shift of the initial destruction temperature to higher temperatures. Furthermore, during the thermal destruction of the composite, the yield of carbonized structures increases (from 54 to 70–77% of the mass), preventing the release of volatile pyrolysis products into the gas phase, which leads to a decrease in the flammability of the epoxy composite. The efficiency of the functionalization of the diorite surface with APTES has been proven, which ensures chemical interaction at the polymer matrix/filler interface and also prevents the aggregation of diorite particles, which, in general, provides an increase in the strength characteristics of epoxy-based composite materials by 10–48%.
Highlights
In the modern world, requirements for performance properties for various materials and products obtained from them are constantly increasing and it is possible to provide them by selecting raw materials and the technological parameters of production [1,2,3].The combining or physicochemical modification of various materials that make up epoxy compositions makes it possible to directly control the most important properties of epoxy composites
Epoxy composites filled with organoclay have higher thermal stability; in addition, the introduction of organoclay provides an increase in the yield of carbonized structures being a physical barrier for the interdiffusion of the oxidizer and combustible gases into the combustion zone, which reduces the flammability of the epoxy composite
The addition of diorite into the epoxy composition initiates the structure formation processes of an epoxy composite, which is observed in a reduction in the gelation time and the curing time, wherein the curing time for a composition with a diorite content of 50 parts by mass increases slightly, which is apparently due to the high viscosity of the composition and the steric hindrances of the curing process
Summary
Requirements for performance properties for various materials and products obtained from them are constantly increasing and it is possible to provide them by selecting raw materials and the technological parameters of production [1,2,3].The combining or physicochemical modification of various materials that make up epoxy compositions makes it possible to directly control the most important properties of epoxy composites. Requirements for performance properties for various materials and products obtained from them are constantly increasing and it is possible to provide them by selecting raw materials and the technological parameters of production [1,2,3]. The addition of fillers ensures an increase in the strength of epoxy composites and imparts specific physical and chemical properties to them [6,7,8,9]. The effect of the addition of a filler on the properties of the polymer is determined by many factors: the chemical nature of the polymer and filler, the nature of the filler surface, the size and shape of its particles, the ability to form their own structures, a change in the conformational set of macromolecules and the structure of the polymer itself. The added fillers with different quantitative content have different effects on the structure of polymers [10,11,12,13]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
