To investigate if there were any difference in acetic acid content between the central zone and the outer zone of the cross section of Alon, the fibrous acetylated rayon, piled cellophane sheets were acetylated in the retention of sheet form with alkali acetate catalyst.
The sheets of cellophane piled could be almost uniformly acetylated in the same manner as was used for production of Alon. There is hardly any difference in acid content between the first (outerest) sheet and the fifth (iunerest) one. One sheet of cellophane is 22μ thick. Hence the thickness of the piled sheets totals 220μ.
On the other hand the raw material of Alon, high tenacity rayon, has a laterally uniform fine structure, not having bilateral structure as crimped rayon, It is 12μ in diameter.
Taking these facts into consideration, it may be concluded that Alon has a microscopically uniform cross section. In other words both the central zone and the outer zone of Alon cross section have the same acetic acid content.
In addition, the accessibilities of various rayons pretreated in different ways are discussed.
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