Abstract:

In order to prepare the functional fibers of Lyocell, the possible effects of additives on Lyocell solvent recovery in the process of functionalization was investigated. The dispersion and thermal stability of microcapsules in N-nethylmorphdine-N-oxide (NMMO) were tested. A small amount of N-methylmorph dine (NMM) and morphdine (M) were added to NMMO, and the changes of ultraviolet and infrared spectra during this process to determine whether the addition of microcapsules caused more decomposition of NMMO were studied. The minimum detectable concentration of microcapsule dispersion was tested with ultraviolet spectrum, and it was found that even dilution to 2 ppm we could detect the presence of microcapsules in the ultraviolet spectrum. Infrared radiation spectra, ultraviolet spectra of microcapsule was studied on the NMMO, and results show that the microcapsule would not make NMMO decompose into NMM and M too much, and about the detection of coagulation bath also suggests that microcapsules in the coagulation bath content below the instrument detection limit, so microcasules will not affect the Lyocell solvent recovery. The damage rate of microcapsules in Lyocell fiber was calculated according to differential scanning calorimetry. The phase change Lyocell fiber bas good phase transition performance, and the mechanical peoperties meet the requirements.

Key words: N-methylmorpholine-N-oxide, phase change Lyocell fiber, microcapsules, solvent recovery