Terluran 886S, Cycolac TCA Q, Lego "brick", Novodur P2M and Magnum 3416 HH
Measuring cell: DSC20
DSC821e with liquid nitrogen cooling
Pan: Aluminum standard 40 μl, pierced lid
Sample preparation: Disk cut from pellet or injection-molded part
DSC measurement: In a first heating run, the thermal history is eliminated by heating from 30 to 250 °C. After uncontrolled cooling to room temperature, the actual measurement is performed at 20 K/min in the DSC20 and at 10 K/min in the DSC821e. With the latter, the initial temperature was -150 °C.
Atmosphere: Nitrogen, 50 cm3/min
The table lists the glass transition temperatures as midpoints.
The most pronounced thermal effect of ABS is the glass transition of the polystyrene component around 100 °C. In the low temperature range, DSC can also detect the polybutadiene transition. Above 100 °C. In the low temperature range, DSC can also detect the polybutadiene transition. Above 100 °C, there is a peak caused by the polyacrylonitrile. Since it is a peak rather than a change in cp, the peak temperature is recommended for characterization. ABS with a very low content of polyacrylonitrile does not exhibit this peak.
Note: some authors interpret the peak around 130 °C as being due to melting of slip additive or mold lubricant.
The DSC curves of the ABS samples are different and can be used to characterize the materials. DSC is therefore a good method for the quality control of incoming ABS material.
ABS Glass Transition by DSC | Thermal Analysis Handbook No.HB251 | Application published in METTLER TOLEDO TA Application Handbook Thermoplastics