ASA: Acrylonitrile-Styrene-Acrylate Copolymer

General Properties

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ASA

Acrylonitrile-Styrene-Acrylate Copolymer


Acrylonitrile-styrene-acrylate copolymer (ASA) like ABS (see previous example) is also a terpolymer of three monomer units and has similar properties, but is more weather-resistant. ASA can be referred to as SAN-Polymer when acrylic ester is evenly distributed throughout the polymer.

Structural Formula


Properties

Glass Transition TemperatureThe glass transition is one of the most important properties of amorphous and semi-crystalline materials, e.g., inorganic glasses, amorphous metals, polymers, pharmaceuticals and food ingredients, etc., and describes the temperature region where the mechanical properties of the materials change from hard and brittle to more soft, deformable or rubbery.Glass Transition Temperature50 to -40 / 95 to 105°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 Temperature415 to 425°C
Young's Modulus2300 to 2900 MPa
Coefficient of Linear Thermal Expansion85 to 105 *10-6/K
Specific Heat Capacity1.3 to 1.4 J/(g*K)
Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.Thermal Conductivity0.17 to 0.19 W/(m*K)
Density1.04 to 1.07 g/cm³
MorphologyAmorphous thermoplastic
General propertiesHigh impact strength and stability. High chemical stability, high gloss, high weatherability.
ProcessingInjection molding, extrusion
ApplicationsOuter parts of vehicles. Thermalls stressed electrical devices, e.g.coffee machines and microwaves. Sport and leisure sector.

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass11.40 mg
IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phase15 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (50 ml/min)

Evaluation

Two glass transitions can be seen in the above DSC curves. The first Glass Transition TemperatureThe glass transition is one of the most important properties of amorphous and semi-crystalline materials, e.g., inorganic glasses, amorphous metals, polymers, pharmaceuticals and food ingredients, etc., and describes the temperature region where the mechanical properties of the materials change from hard and brittle to more soft, deformable or rubbery.glass transition can be attributed to the acrylate component and occurs in the 2nd heating at -50°C (midpoint, red curve) with a change in specific heat of 0.04 J/(g.K)). The second Glass Transition TemperatureThe glass transition is one of the most important properties of amorphous and semi-crystalline materials, e.g., inorganic glasses, amorphous metals, polymers, pharmaceuticals and food ingredients, etc., and describes the temperature region where the mechanical properties of the materials change from hard and brittle to more soft, deformable or rubbery.glass transition is due to the styrene component. The larger the RelaxationWhen a constant strain is applied to a rubber compound, the force necessary to maintain that strain is not constant but decreases with time; this behavior is known as stress relaxation. The process responsible for stress relaxation can be physical or chemical, and under normal conditions, both will occur at the same time. relaxation peak, the more positively shifted the Glass Transition TemperatureThe glass transition is one of the most important properties of amorphous and semi-crystalline materials, e.g., inorganic glasses, amorphous metals, polymers, pharmaceuticals and food ingredients, etc., and describes the temperature region where the mechanical properties of the materials change from hard and brittle to more soft, deformable or rubbery.glass transition temperature to higher temperatures, as in this example.