PA6/3T: Polyamide 6/3T

General Properties

Short Name:

Name:

PA6/3T

Polyamide 6/3T

Polyamide 6/3T belongs to the semi-aromatic amorphous polyamides, made of the monomer trimethyl hexamethylene diamine and terephthalic acid (T represents terephthalic acid). Polyamide 6/3T has a quite irregular structure, strongly decreasing the tendency to crystallize.

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 Temperature	145 to 153°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 reactionA decomposition reaction is a thermally induced reaction of a chemical compound forming solid and/or gaseous products. Decomposition Temperature	460 to 470°C
Young's Modulus	2000 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 Expansion	80 *10^-6/K
Specific Heat Capacity	1.6 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	0.23 W/(m*K)
DensityThe mass density is defined as the ratio between mass and volume. Density	1.12 g/cm³
Morphology	Amorphous thermoplastic
General properties	High mechanical stability. High chemical resistance. Good electrical insulation properties. Low processing shrinkage and tendency to wrap
Processing	Extrusion, injection molding, blow molding
Applications	Electrical engineering/electronics (switch housings, gear wheels, push buttons …). Mechanical and apparatus engineering (valve and control blocks, flow meter ...). Water management and filter technology

NETZSCH Measurement

Instrument	DSC 204 `F1` `Phoenix^®`
Sample Mass	12.73 mg
IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phase	3 min / 3 min / 5 min
Heating/Colling Rates	10 K/min
Crucible	Al, pierced lid
Atmosphere	N₂ (50 ml/min)

Evaluation

Typically an amorphous polymer, PA6/3T exhibits a 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 with a midpoint temperature of 142°C (1^st heating, blue, midpoint) and 147°C (2^nd heating, red, midpoint) which was overlapped by a 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 in the 2^nd heating. The step heights (Δc_p) of this example were approx. 0.39 J/(g.K) (mean value of both heatings).