Welding UV-blocking cellulose nanocrystals onto PET fibers via surface dissolution for durable functional textiles

Simultaneously improving the functional durability and ecological sustainability of textile dyeing and finishing techniques has long presented a formidable challenge in textile processing. This study utilized a surface-dissolution strategy to functionalize polyethylene terephthalate (PET) yarns with cinnamate-functionalized cellulose nanocrystals (CinCNC), imparting durable ultraviolet (UV)-blocking properties. Incorporating CinCNC stabilized the yarn, reducing the coefficient of variation (CV) for yarn breaking strength to 6.43%, significantly enhancing its stability. The resultant woven fabric exhibited excellent UV-blocking performance, wash fastness, air permeability, and antistatic properties. The fabric achieved a maximum ultraviolet protection factor (UPF) of 273.54, retaining a UPF of 203.20 after 10 laundering cycles. Compared to conventionally coated fabrics, this method improved fabric air permeability by 22.60%. Furthermore, the static dissipation rate of fabrics processed via this technique increased by 46.70% compared with the untreated counterparts. The yarns and fabrics produced using this approach demonstrated outstanding overall properties, further underscoring the advantages of functional nanocellulose in developing advanced textiles. This technique holds significant potential for superseding conventional coating methods and may find application in producing outdoor tents and umbrellas.