Properties of Epoxy-Diane Composites Modified by Techno-Genic Fillers

Polymer Engineering & Sci

2021

In this article, we study the process of polymerization of a modified ED-20 epoxy binder under conditions of highly filled systems. It is found that modifying additives affect the process of polymerization of the binder, increasing the degree of conversion of epoxy groups of ED-20 resin, speeding up the process of polymerization, and increasing the exothermic effect of the reaction. Curing in the presence of a modifying silicon-containing additive takes place in a mode that promotes the formation of a more ordered structure, creating opportunities for relaxation of internal stresses and favorable conditions for the formation of an ordered microstructure. The equations sufficiently fitting the measured points of the concentration of epoxy groups are calculated. We obtain the kinetic curves of curing, which illustrate the process of heat release of the ED-20 binder and the same system modified with mineral fillers. It is found that the heat release occurs more intensively when modifiers are introduced into the epoxy binder. It is derived that the experimental data of kinetics of heat release at considered time range can be sufficiently described by a parabolic equation.

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Section: Introductionmentioning

confidence: 99%

Kinetic features of polymerization of epoxy resin modified by silicon‐containing additives and mineral fillers

Polymer Engineering & Sci

2021

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“…However, the studies of thermosetting binders and highly filled composites for construction purposes were carried out insufficiently. 21…”

Section: Introductionmentioning

confidence: 99%

Kinetics of epoxy resin optical characteristics during ultrasonic processing

Journal of Composite Materials

2021

In this paper, the ultrasonic processing of composite based on epoxy resin ED-20 filled by nanoparticle silicon–containing additives PDMS-5 and HDK during its preparation is studied. Changes in optical transmittance spectra of organosilicon gel (PDMS-5+HDK) and of composite ED-20+L-20+(PDMS-5+HDK) are reported. The observed optical transmission changes were modeled from the experimental results. New phenomenological model describing the kinetics of a change in transmittance with ultrasonic processing time of composite is proposed. The nonlinear differential equation of the process is formulated and solved. The solution of equation applies to description of the experimental data of monitoring of transmittance of composite ED-20+L-20+(PDMS-5+HDK) during ultrasonic processing. The nonlinear functions characterized by three plateaus are proposed to describe the experimental data of monitoring of optical properties of organosilicon gel (PDMS-5+HDK) during ultrasonic processing.

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The equation of glass transition of epoxy diane resin modified with the nanoparticle fillers

2021

Polym. Bull.