Study on the preparation and properties of the long afterglow luminescent Lyocell fibers

In this paper,different coupling agents were used to modify the luminescent powder and the change of sedimentation properties of luminescent powder in aqueous NMMO solution was compared,and then a suitable titanate coupling agent was chosen to improve the dispersion stability of luminescent powder in NMMO solution.Moreover,the long afterglow luminescent Lyocell fibers were spun by the dry-jet wet spinning process.The results showed that the tensile strength of fibers was improved after the treatment of the coupling agent.With the increase of luminescent powder content,the degree of crystallinity and the thermal property of fibers were decreased slightly,whereas the initial luminescent intensity was improved.When the content of the uminescent powder was more than 10wt%,the afterglow decay-time constants of luminescent Lyocell fibers were increased significantly,and the afterglow property of fibers was improved.