Table 1. Fig. 1 shows the afterglow decay curve of SMSED phosphors and SMSED-PP fibers mixed with phosphors of different contents. Additionally, as tested in the dark room, the afterglow decay time of each sample from the initial intensity to 0.32 mcd/m2, which is the minimum intensity and can be observed by human eye, is about 7 h. In other words, the afterglow life has no distinct connection with the content of SMSED. As shown in Table 1 and Fig. 1, the initial afterglow intensity of SMSED-PP fiber was increased with the addition of SMSED in the fiber, while the breaking tenacity and breaking elongation were decreased. The afterglow intensity of SMSED phosphors was obviously higher
than that of SMSED-PP luminescent fibers, with an initial intensity of 2.6 cd/m2. SMSED-PP fibers containing SMSED of 5 wt.% and 10 wt.%, whose afterglow inten- sities were close, and the overall level was low, with an initial intensity of only approximately 0.3–0.5 cd/m2, revealed better breaking tenacity, breaking elongation and spinnability. The SMSED-PP fiber containing SMSED of 20 wt.% showed better afterglow intensity, with an initial intensity of 1.09 cd/m2, but a poor spinnability. The end breakage rate was increased significantly during the spinning process with a low level of the breaking tenacity and breaking elongation. When the content of SMSED phosphors was 15 wt.%, the SMSED-PP fiber revealed good tensile properties, spinnability and afterglow intensity, with initial afterglow intensity up to more than 0.8 cd/m2, the breaking tenacity of 3.05 cN/dtex and breaking elongation of 15.5%, thus meet- ing with the requirements of practical product applications.
Table 1. Fig. 1 shows the afterglow decay curve of SMSED phosphors and SMSED-PP fibers mixed with phosphors of different contents. Additionally, as tested in the dark room, the afterglow decay time of each sample from the initial intensity to 0.32 mcd/m2, which is the minimum intensity and can be observed by human eye, is about 7 h. In other words, the afterglow life has no distinct connection with the content of SMSED. As shown in Table 1 and Fig. 1, the initial afterglow intensity of SMSED-PP fiber was increased with the addition of SMSED in the fiber, while the breaking tenacity and breaking elongation were decreased. The afterglow intensity of SMSED phosphors was obviously higher
than that of SMSED-PP luminescent fibers, with an initial intensity of 2.6 cd/m2. SMSED-PP fibers containing SMSED of 5 wt.% and 10 wt.%, whose afterglow inten- sities were close, and the overall level was low, with an initial intensity of only approximately 0.3–0.5 cd/m2, revealed better breaking tenacity, breaking elongation and spinnability. The SMSED-PP fiber containing SMSED of 20 wt.% showed better afterglow intensity, with an initial intensity of 1.09 cd/m2, but a poor spinnability. The end breakage rate was increased significantly during the spinning process with a low level of the breaking tenacity and breaking elongation. When the content of SMSED phosphors was 15 wt.%, the SMSED-PP fiber revealed good tensile properties, spinnability and afterglow intensity, with initial afterglow intensity up to more than 0.8 cd/m2, the breaking tenacity of 3.05 cN/dtex and breaking elongation of 15.5%, thus meet- ing with the requirements of practical product applications.
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