Orientation of Saran

Tsunoda Yoshio, Aishima Itsuho, Sakurai Hisaya

doi:10.1295/koron1944.16.527

In the previous paper, it was pointed out that the crystallinity of filaments was less than 30% and that their mechanical properties change with the orientation of filament. In the present paper, the dichroic ratio of filament is measured with a Leitz polarizing microscope and the change in orientation of the amorphous part by stretching is investigated. Owing to difficulties in after-dyeing Saran filament, polymer is mixed with dyes or pigments and then extruded into filaments. The dichroic ratio is then measured from these filaments. Oil Red O was selected as the dye to be used. This dye is a diazo derivative having a comparatively large and long molecular dimension. It appears only in the amorphous part of the filament. So the dichroic ratio measured by this method is assumed to show the orientation of amorphous part. The dichroic ratio of plasticized filament increases linearly with stretch ratio up to a stretch ratio of 2.5. It is fairly constant between the stretch ratio of 2.5 and 4.5. It decreases distinctly at a stretch ratio of 4.7. On the other hand, the dichroic ratio of non-plasticized filaments increases linearly up to the stretch ratio of 3.0 and then decreases rapidly above this stretch ratio. The increase is considered to be due to the disorder of the arrangement of the amorphous part of the filament.

Orientation of Saran

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