Dynamic Cure Kinetics and Physical-Mechanical Properties of PEG/Nanosilica/Epoxy Composites

Abstract

This study investigated the effect of polyethylene glycol (PEG) and nanosilica (NS) on the physical-mechanical properties and cure kinetics of diglycidyl ether of bisphenol-A-based epoxy (DGEBA-based EP) resin. For this purpose, tensile and viscometry tests, dynamic mechanical thermal analysis (DMTA), and differential scanning calorimetry (DSC) were carried out under dynamic conditions. The results showed that adding NS and PEG enhances the maximum cure temperature as well as the heat of cure reaction (ΔH) in EP-NS, while it decreases in EP-PEG and EP-PEG-NS. The cure kinetic parameters of EP-PEG-NS were calculated by Kissinger, Ozawa, and KSA methods and compared with each other. The Ea calculated from the Kissinger method (96.82 kJ/mol) was found to be lower than that of the Ozawa method (98.69 kJ/mol). Also, according to the KAS method, the apparent Ea was approximately constant within the 10-90% conversion range. Tensile strength and modulus increased by adding NS, while tensile strength diminished slightly by adding PEG to EP-NS. The glass transition temperature (Tg) was calculated using DMTA which was increased and decreased by the addition of NS and PEG, respectively. The results of the viscometry test showed that the viscosity increased with the presence of both PEG and NS and it prevented the deposition of solid particles.

Study on Curing Kinetics and the Mechanism of Ultrasonic Curing of an Epoxy Adhesive

“…In the study of curing kinetics, one of the most important parameters is the apparent activation energy . At present, two methods are mainly applied to calculate the constant of the curing reaction by non-isothermal methods: the Ozawa method and the Kissinger method [ 18 ]. The Ozawa method formula is as follows: where is the heating rate (K/min) and is the peak temperature (K).…”

A review of recent progress in improving the fracture toughness of epoxy‐based composites using carbonaceous nanofillers

“…[ 72 ] They are one of the most important materials, which have many coating, electrical, composites, adhesives, and other applications. [ 73 ] The simplest EP is alpha EP (1,2‐EP) which features a three‐member ring structure. [ 74 ] The most commonly used EP is diglycidyl ether bisphenol‐A (DGEBA), which accounts for more than 70% of all EP usage.…”

Evaluating the mechanical, thermal, and antibacterial properties of poly (lactic acid)/silicone rubber blends reinforced with (3‐aminopropyl) triethoxysilane‐functionalized titanium dioxide nanoparticles

“…Polymers have drawn much attention because of their diversity, versatility, and practicality. [1][2][3][4][5][6][7][8][9][10][11][12][13] Poly(lactic acid) (PLA), derived from renewable resources, exhibits outstanding properties such as good strength, high modulus, and optical clarity. Thanks to these remarkable features, PLA is one of the most widely utilized biodegradable and biocompatible plastics used in the industrial packaging field or in the biocompatible/bioabsorbable medical device market.…”