PA6/6T: Polyamide 6/6T

General Properties

Short Name:

Name: 

PA6/6T

Polyamide 6/6T


Like PA6/3T, polyamide 6/6T belongs to the semi-aromatic polyamides but is semi-crystalline. It is a copolymer made from caprolactam, hexamethylene diamine and terephthalic acid (therephthalic acid is represented by the letter T).

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 Temperature60 to 100°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 Temperature250 to 300°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 Temperature460 to 480°C
Young's Modulus3500 to 3600 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 Expansion70 *10-6/K
Specific Heat Capacity-
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. Density1.18 g/cm³
MorphologySemi-crystalline polymer
General propertiesHigh mechanical stability. High chemical resistance. High toughness in the cold. Higher temperature resistance than PA6 or PA6.6
ProcessingInjection molding
ApplicationsElectrical engineering/electronics (gear wheels, plug connectors…). Axes. Fishing equipment

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass12.29 mg
IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phase5 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (50 ml/min)

Evaluation

The large 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 overlapping 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 (midpoint: 61°C) in the 1st heating (blue) indicates that this polymer sample had been tempered in a temperature range of 40°C to 50°C or had been stored in that temperature range for a long period of time. Due to the elimination of water (broad peak from approx. 90°C to 180°C) during the 1st heating, 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 shifted to 101°C (midpoint) in the 2nd heating (red). In the 2nd heating (red), the sample melting began after a small ExothermicA sample transition or a reaction is exothermic if heat is generated.exothermal post-CrystallizationCrystallization is the physical process of hardening during the formation and growth of crystals. During this process, heat of crystallization is released.crystallization (peak: 141°C) following 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; the temperature of the main peak was 299°C. The corresponding melting enthalpy amounted to 40 J/g. In the first heating, the total melting enthalpy was 29 J/g and thus a bit lower than in the 2nd heating, indicating that additional CrystallizationCrystallization is the physical process of hardening during the formation and growth of crystals. During this process, heat of crystallization is released.crystallization had occurred during the intervening cooling segment. Nevertheless, the 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 (peak temperature) of 298°C was similar to that in the 2nd heating.