This research investigates changes occurring in lyocell fibers resulting from exposure to simulated sunlight, FTIR microspectroscopy is used in combination with measurements of tensile properties, fluidity, moisture regain, yellowness, weight loss, and birefringence. X-ray diffraction and SEM are used to determine crystallinity and fiber surface changes, respectively. The results indicate no significant changes in physical properties up to 96 hours' exposure. At 168 hours, open pores appear on the fiber surface, probably due to the release of gaseous products, accompanied by an increase in moisture regain.
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