EP: Epoxy resin

General Properties

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EP

Epoxy resin


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.

Structural Formula


Properties

Glass Transition Temperature50 to 200°C
Melting Temperatures and EnthalpiesThe enthalpy of fusion of a substance, also known as latent heat, is a measure of the energy input, typically heat, which is necessary to convert a substance from solid to liquid state. The melting point of a substance is the temperature at which it changes state from solid (crystalline) to liquid (isotropic melt).Melting Temperature-
Melting Temperatures and EnthalpiesThe enthalpy of fusion of a substance, also known as latent heat, is a measure of the energy input, typically heat, which is necessary to convert a substance from solid to liquid state. The melting point of a substance is the temperature at which it changes state from solid (crystalline) to liquid (isotropic melt).Melting Enthalpy-
Decomposition Temperature380 to 450°C
Young's Modulus3000 to 5000 MPa
Coefficient of Linear Thermal Expansion60 *10-6/K
Specific Heat Capacity1.67 to 2.10 J/(g*K)
Thermal Conductivity0.17 to 0.52 W/(m*K)
Density1.15 g/cm³
MorphologyThermoset
General propertiesGood toughness. Good adhesion on many substrates. Good chemical resistance. Low cure shrinkage
ProcessingCompression, spreading, injection processes such as RIM, VARI, RTM
ApplicationsBuilding industry (e.g., corrosion protection, sealings, floor coating). Boat building (construction adhesive). Electronics industry (circuit boards). Matrix for fiber-reinforced composites

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass13.22 mg
Isothermal Phase5 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (40 ml/min)

Evaluation

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.