Evaluation of Enhanced UV Protection Property of Dyed Cotton Fabrics Based on Inclusion Complex of β-cyclodextrin with Natural Coumarin Extracted from Cortex fraxini

Inclusion complex formed between β-cyclodextrin (β-CD) and natural coumarins extracted from Cortex fraxini were utilized to dye and enhancing the UV protection properties of cotton fabric. Natural coumarins were extracted from Cortex fraxini and the total amount of natural coumarins was evaluated. The inclusion complex of natural coumarins with β-CD were formed and analyzed by ultraviolet-visible spectrum, fluorescence spectroscopy, FTIR and TGA. The obtained results showed that a stoichiometry of 1:1 inclusion complex was formed and the fluorescence intensities and ultraviolet absorption of the natural coumarins were both enhanced by incorporating into β-CD. β-CD was grafted onto cotton fabric based on esterification of citric acid with cellulose and cyclodextrin in the presence of sodium hypophosphite. The grafted cotton fabric was then dyed with natural coumarins extraction of Cortex fraxini as natural ultraviolet absorbent to form stable inclusion complex. UV protection factor (UPF), UVA transmittance (T_UVA) and UVB transmittance (T_UVB), wrinkle recovery and tensile strength of dyed fabrics were evaluated and demonstrated that graft modification of fabrics with β-CD resulted enhancement in UV protection property and durability accompanied with increasing in wrinkle recovery properties and decreasing in tensile strength. Furthermore, apparent morphology, FTIR and TGA analysis of inclusion complexes loaded cotton fabrics and the relationship between structure and properties were investigated.