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Evaluation of the influence of low molecular weight components to the retention of the hydrophobicity of silicones by using the dynamic drop test

Polymeric outdoor insulation material provides the properties of hydrophobicity, which has an important effect on the functionality in the application. The retention of the hydrophobicity depends on various factors, whereby the combined electric and electrolytic stress is close to the application. In this paper, all of the investigations are focused on silicones. The retention and the recovery of the hydrophobicity is provided by different processes. One of them is attributed to the low molecular weight (LMW) contents of the silicones. For this reason, the retention of the hydrophobicity behavior after different chemical treatments is evaluated. For the measurement of the retention of the hydrophobicity the Dynamic Drop Test (DDT) is used. The DDT has proven to be a suitable test method and the investigations are intended to improve the test with respect to repeatability and reproducibility. In this paper, after a short introduction to the topic, the investigation process is described, the measuring setup and the measurement results are shown and discussed.