シリコーン油/芳香族ポリアミド絶縁系の劣化挙動

抄録

Thermal degradation behavior of Silicone/Aromatic polyamide insulation system was discussed. It was found that the flash- and fire- points decreased owing to the formation of low-molecular-weight by-products of such cyclic siloxane oligomers as D₃, D₄ and D₅. The GPC and HPLC analysis clarified that the depolymerization of siloxane molecules and also re-polymerization of the decomposed siloxane molecules happen during the thermal aging, resulting in the high and low molecular products formation. The TGI index obtained by the TG measurements and cyclic oligomers detection of the silicone fluid may provide an appropriate insulation diagnosis.