Abstract
We have investigated the role of polymerization degree on the surface microstructure of insulating paper for power cable by means of the electronmicroscope.
When the pulp of _??_ 1, 650_??_445 is beaten to SR 40°, in the case of _??_ 1, 650, the surface is covered with S1 wall layer and internal fibrillation of S2 wall layer is incomplete. In _??_ 1, 270, it is clarified that most part of the S1 wall layer is separated, and fine internal fibrillation parallel to the fiber axis is found. In such a microstructure, the values of the mechanical and electrical properties are found higher.
Under the _??_ 1, 000, fiber was partially cut and broken during beating, and then mechanical strength of paper was lowered. Moreover, it appears that the fibrillation of S1 and S2 wall layer is disproportionate. But most of the S2 wall layer is internally less fibrillated, and the microstructure on the surface disordered.
