Collecting Data with a Differential Scanning CalorimeterDifferential Scanning Calorimetry (DSC) is the most known and widespread thermal analysis technique for the characterization oof polymers. During DSC analysis, a sample and a reference are subjected to a controlled heating profile, thus enabling to determine changes endothermal and exothermal effects of the sample. As a result reversible and non-reversible phase transitions of a polymer sample can be detected. These are:
- the glass-transition temperature,
- the melting and crystallization of semi-crystalline thermoplastics and
- the curing of cross-linking polymers.
Performing Kinetic Studies and Predicting the Material BehaviorIn order to be able to predict the material behavior for different process scenarios, the measured DSC data at the four different heating ramps have been uploaded to the NETZSCH Kinetics Neo software. The conversion fit below shows a model-free approach to the measurement data using a very easy-to-use klick solution. The mathematics behind the model is a newly developed model-free approach, called “numerical optimization”, specially designed for users without any experience in kinetic’s simulation. In order to avoid overheating and therefore material damage, it has been ensured that the maximum reaction rate of the conventional cycle won’t be exceeded in the new shorter cycle and was limited in the software settings. If you want to get more information about how to use Kinetics Neo to model the curing process please visit the following website: Epoxy Resin – Curing, Partial Diffusion Control
Dramatic Reduction in Cycle TimeThe case shown here, combining the widely used Differential Scanning Calorimetry and the powerful Kinetics Neo software, demonstrates impressively how production cycles can be optimizes. Compared to trial and error manufacturing, material characterization and simulation is much more efficient and can bring the composite industry big cost savings in terms of material and time. The autoclave manufacturing cycle of the CFRP bike rim of Blacks Srl could be reduced by 46 % compared to the conventional curing cycle of the material data sheet meeting the requirements of the degree of cure and avoiding overheating at the same time.
|Cycle||Thermal Cycle||Durata totale ciclo termico (min)||ΔH (J/g)||Degree of cure (%)|
|conventional||RT-70°C HR=2.3°C/min 70-130°C HR=1.3°C/min Isothermal at 130°C x 270min Cooling||480||-9.25||95.9|
|new||RT-110°C HR=3°C/min Isothermal at 110 x 10min 110-130°C HR=3°C/min Isothermal at 130°C x 60min Cooling||260||-8.63||96.1|
Alexander has more than 6 years of experience in various production processes and the characterization of polymer materials and composites. He worked at the Application Center for Materials and Environmental Research (AMU) at the University of Augsburg and the Department of Functional Lightweight Construction at the Fraunhofer Institute for Chemical Technology ICT before being recruited by NETZSCH Analyzing&Testing. At NETZSCH Analyzing&Testing he was one of the drivers behind the founding of the Business Field Process Analytics and became its Manager. Process Analytics focuses on real-time sensors and model-based algorithms for intelligent manufacturing of polymers and composites, automated and robust production to contribute to the factory of the future.