抄録
According to acetylate cotton linter, we have observed following three cellulose acetates; the degree of acetylation 59.17%, 57.4% and 54.9%.
The first one was fractionated with methylene chloride-ethanol and the rest with acetone-ethanol.
The acetates were saponified with 20% ammonium hydroxide and the nitrates made by nitration of the regenerated cellulose were fractionated with acetone-ligroin.
In a comparison between distribution curves of nitrates and of acetates, it was shown that the fractionation of the nitrates gave more precise result than that of the acetates themselves.
In the distribution curves the high DP portions decreased with the time of saponification.
A non-uniformity coefficient increased in early stage, but decreased with the proceeding of sapo-nification.
We investigated the results of the experiments after Beall-Jörgensen theory, and assumued that the hydrolysis of glucoside linkage takes place at random in initial stage of saponification, but not at random after the hydrolysis proceeded.
