Type 1 Pilot Action:
OTTRONIC Regeltechnik GmbH – Analysis – Mixing homogeneity of encapsulation material

Goal: To reinforce polymeric materials, fillers are often added. With different fillers and filler densities, uniform mixing should be ensured during the one-shot packaging process. In addition, the OH content is a decisive factor for the durability of the embedded electronics. The aim is to find out to what extent a separation took place over the flow path (during encapsulation) depending on the filler content and how high the OH content of the respective sample is.

Approach: To determine the homogeneity, the thermal stability of samples from different process sections is measured using TGA measurements and the chemical composition is measured using FTIR and an XPS measurement is performed to determine the OH groups.

Results: For the determination of the OH concentration in this material class, the XPS measurement setup turned out to be unsuitable. The IR measurements showed that all flow-dependent samples (A, M and E) are chemically identical. The mass loss curves of the TGA measurements indicate a high thermal stability of the samples and a reproducibility of sample A and M. The resin cubes A and M degrade in the same way (one degradation step), but in comparison the resin cube E has been degraded in two degradation steps, which is an indication for inhomogeneity.

Involved Partners: PCCL, UNG