抄録
The brief procedure for preparation of cellulose phosphate by the urea-phosphoric acid had been described by S. Coppick, but no detailed report had been published. The influence of the molar ratio of urea and phosphoric acid, the degree of compression, temperature and duration of preliminary drying on the phosphorylation of cellulose were studied. There were optimum molar ratio between them for obtaining highly phosphorylated cellulose. When the molar ratio is constant, the sample prepared under the condition of higher temperature and shorter duration of reaction showed less degradation and higher reactivity. As a whole, the rate of main reaction occured was very small, and by repeating the reaction 3 times the sample containing only 9.03% phosphorous could be obtained. All samples obtained were insoluble in water and dil. NaOH aq., and were fibrous. As a result of high frequency titration, all phosphate radicals were known to be in the form of two basic ester and the existence of bridge linkage could not he recognized.
