| 摘要 |
PROBLEM TO BE SOLVED: To easily measure a deterioration degree of insulating materials of various types and shapes.SOLUTION: An insulating material before deterioration and the insulating material after deterioration are each dissolved in a solvent; and intrinsic viscosities are calculated based on the concentrations and viscosities of the respective solutions. An intrinsic viscosity is calculated based on the Solomon-Ciuta equation. A deterioration degree of an insulating material after deterioration is determined based on the intrinsic viscosity of a solution in which the insulating material before deterioration is dissolved and on the intrinsic viscosity of a solution in which the insulating material after deterioration is dissolved. Otherwise, a ratio of the intrinsic viscosity of the solution in which the insulating material after deterioration is dissolved to the intrinsic viscosity of the solution in which the insulating material before deterioration is dissolved is calculated as a molecular weight retention rate; and a deterioration degree of the insulating material after deterioration is measured based on the molecular weight retention rate. |
