Abstract
Composite Lyocell fibers were successfully prepared from cotton linter pulp and bamboo hemicelluloses with N-methyl-morpholine-N-oxide as a solvent. The viscosity of the spinning solutions, as well as the structural and mechanical properties of the composite fibers were investigated to understand the effect of hemicelluloses on the dissolution process and the properties of fibers. The addition of hemicelluloses raised the concentration of spinning dopes and reduced the average molecular weight of raw materials, leading to the increase and then decrease of the viscosity of solution. The crystal and morphological structure of the fibers were slightly influenced by the presence of hemicelluloses, while the tensile strength and modulus of the fibers were improved by adding appropriate amount of hemicelluloses. Moreover, the distribution of hemicelluloses in the solution and composite fiber were proposed to illustrate this regulating effect. This study provided an alternate way to improve the properties of Lyocell fibers and enlarge the utilization of hemicelluloses.
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