Abstract
In order to prepare cellulose (cell.) - cellulose phenyl thiourethane (CPTU) mixed fiber, the viscosity of CPTU solution in alkali, properties of blended viscose and its spinnability were studied.
The results obtained are as follows:
(1) From the viscometric investigation of dilute and concentrated CPTU solutions, it is estimated that CPTU (0.225mol substituted/glucose unit) in 6-9% NaOH aqueous solution homogeneuosly dissolved is the most suitable state and thixotropic behavior appears at high degree of concentration.
(2) The viscosity fo blended viscose decreases by increasing the degree of CPTU content and it is found that blended viscose could be homogeneous for a period of time sufficient to filter and deaerate, and good compatibility between cellulose sodium xanthate and CPTU may be expected.
Velocity of decomposition of xanthate groups in blended viscose is faster than viscose.
(3) In the spinning by Müller bath, maximum stretching of spinning increases by increasing the degree of CPTU content, and maximum speed of spinning gives a maximum point at nearly 30% content of CPTU.
