Master curve and time–temperature–transformation cure diagram of a polyfunctional epoxy acrylic resin

Abstract

ABSTRACT:The curing reaction of a well-defined glycidyl methacrylate-co-butyl acrylate statistical copolymer, prepared by atom transfer radical polymerization, and a commercial linear diamine (Jeffamine D-230) was studied with the objectives of constructing and discussing a timetemperature-transformation isothermal curing for this system. Thermal and rheological analyses were used to obtain the gelation and vitrification times. Differential scanning calorimetry data showed a one-to-one relationship between the glass-transition temperature (T g ) and fractional conversion independent of the cure temperature. As a result, T g was used as a measurement of conversion. We obtained a kinetically controlled master curve for isothermal curing temperatures from 50 to 100 C by shifting T g versus the natural logarithm time data to a reference temperature of 80 C. We calculated the apparent activation energy by applying two different methods, gel time measurements versus shift factors, suggesting a good agreement between them. Isoconversion contours were calculated by the numerical integration of the kinetic model.

Impact of aliphatic amine comonomers on DGEBA epoxy network properties

“…This complex behavior may be associated with the networks' lower crosslinking density and presence of a flexibilizing group (OCH 2 ) introduced by the comonomer Jeffamine D230 in the DGEBA/D230 network (Table ). The crosslinking density of a DEGBA network is determined to its functionality (Table ), and the molecular weight between crosslinks ( M c ) (Table ) introduced by comonomers .…”

“…O,O bis (2‐aminopropyl propylene glycol) (Jeffamine D230) was used to employ DGEBA resins and prepare an abrasive composite by using it as an ornamental stone polisher. The aliphatic amine Jeffamine received special attention due to its particular network behavior compared to traditional comonomers used to obtain thermoset epoxy networks .…”

Adhesives Based on Poly(glycidyl methacrylate‐co‐butyl acrylate) with Controlled Structure: Curing Behavior and Adhesion Properties on Metal Substrates

“…[26,27] Finally, its cure reaction with a commercial linear diamine, Jeffamine D-230, was monitored using differential scanning calorimetry (DSC) and rheology techniques, to find out the complete time-temperature-transformation cure diagram of this polyfunctional epoxy acrylic resin with controlled microstructure. [28][29][30] With these previous works, the aim of the present article, is the study of the reaction of this epoxy reactive copolymer with three different hardeners by calorimetry, achieving the best cure reaction settings, and applying it in metal-metal single-lap joints to study its adhesive behavior on iron, brass, aluminum, titanium, and copper surfaces.…”