PA6.12: Polyamide 6.12

General Properties

Short Name:

Name: 

PA6.12

Polyamide 6.12


Polyamid 6.12 (PA6.12) is produced by a polycondensation of the monomers hexamethylene diamine and dodecanedioic acid. See page 98 for an example of the numbering in the polymer name.

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 Temperature40 to 65°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 Temperature210 to 220°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 Enthalpy-
Decomposition reactionA decomposition reaction is a thermally induced reaction of a chemical compound forming solid and/or gaseous products. Decomposition Temperature450 to 465°C
Young's Modulus2100 to 2250 MPa
Coefficient of Linear Thermal Expansion (CLTE/CTE)The coefficient of linear thermal expansion (CLTE) describes the length change of a material as a function of the temperature.Coefficient of Linear Thermal Expansion120 to 130 *10-6/K
Specific Heat Capacity1.91 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 Conductivity-
DensityThe mass density is defined as the ratio between mass and volume. Density1.06 g/cm³
MorphologySemi-crystalline thermoplastic
General propertiesHigh toughness. Very good resistance to fats, oils, fuels. Very good StressStress is defined as a level of force applied on a sample with a well-defined cross section. (Stress = force/area). Samples having a circular or rectangular cross section can be compressed or stretched. Elastic materials like rubber can be stretched up to 5 to 10 times their original length.stress cracking resistance. Low coefficient of sliding friction. High abrasion resistance
ProcessingInjection molding
ApplicationsVehicle construction. Household items, e.g., toothbrushes. Plastic-rubber composites, e.g., for housing covers with seals

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass8.66 mg
IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phase8 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (50 ml/min)

Evaluation

Shown in the 2nd heating (red) of this example is a broad, strongly structured endothermal melting transition with a distinc- tive pre-peak at 202°C and an additional shoulder at 173°C (peak temperatures). The temperature of the main effect (also peak temperature) occurred at 217°C. The total melting enthalpy was approx. 75 J/g. 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 in the 2nd heating had a midpoint temperature of 40°C, at the lower end of 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 for these materials. In the 1st heating (blue), the Tg midpoint was approximately 2 K lower and overlapped by a large RelaxationRelaxation은 고무에 일정한 변형률이 가해지면, 변형률을 유지하기 위해 필요한 힘은 일정하지는 않지만 시간에 따라 감소합니다. 이러한 특성을 ‘응력 완화’라고 부릅니다. 응력완화의 원인이 되는 과정은 물리적 또는 화학적 그리고 정상적인 조건 하에, 둘 다 동시에 일어날 수 있습니다. relaxation peak.