Epoxy resins (EP) undergo a polyaddition cross-linking reaction that does not release small molecules. The properties of the resin are strongly dependent on the structure, the degree of cross linking, type and amount of the reinforcement material and the processing procedure.
|DSC 204 F1 Phoenix®
|Al, pierced lid
|N2 (40 ml/min)
As an amorphous polymer, this epoxy resin exhibits a Temperatura di transizione vetrosaLa transizione vetrosa è una delle più importanti proprietà chimico-fisiche dei materiali amorfi e semi-cristallini, come, ad esempio, vetri, metalli (amorfi), polimeri, ingredienti farmaceutici e alimentari e definisce l’intervallo di temperatura in cui le proprietà meccaniche die materiali variano da duro e fragile a più morbido, malleabile o gommoso.glass transition at 77°C (midpoint) with a Specific Heat Capacity (cp)Heat capacity is a material-specific physical quantity, determined by the amount of heat supplied to specimen, divided by the resulting temperature increase. The specific heat capacity is related to a unit mass of the specimen.specific heat capacity of 0.14 J/(g*K) in the 1st heating (blue) followed by an EsotermicoUna transizione o reazione è esotermica se il materiale genera calore exothermal effect (peak temperature 174°C), due to post-curing of the resin. As a result of the post-curing, the glass transition temperature in the 2nd heating (red) is shifted to 88°C (midpoint). The step height remains nearly the same. Since no further exothermal effect occurs, it can be assumed that the epoxy resin was entirely cured during the 1st heating. Both the exothermal eff ect and the position (and shift) of the glass transition temperature to higher values can be interpreted as an evidence for the degree of curing of the material.