Construction of hydrated lubricated interfaces on lyocell fabric surfaces and effects on anti-fibrillation performance

Abstract

Lyocell bers are currently claimed as green ber with a good application prospect, but the major problem of brillation restricts the further promotion and application. In this study, based on the theory of hydration lubrication at the solid/liquid interface, hexamethylene-diisocyanate trimer (HDIt), polyethylene glycol (PEG), and butanone oxime (MEKO) were used to synthesize a reactive hydrophilic triblock polyurethane (RHT-PU). RHT-PU could construct a water lubrication layer on the lyocell ber surface via hydrogen bonding between polyoxyethylene ether and water molecular, reducing the coe cient of friction (COF) of the ber interface in the water. It was found that PEG molecular weight and grafting density had signi cant dependence on the COF of modi ed fabrics, COFs decreased with the increase of PEG molecular weight and grafting density. In water, the COFs of fabrics modi ed by RHT-PU were reduced from 0.45 to 0.32 and maintained lower COF at higher temperature and higher normal loads. After mechanical friction and household washing test, the surface abrasion of modi ed fabrics were signi cantly improved, and color fading grade of fabrics raised from 3 grade to 4-5 grade. Construction of water lubricated interfaces effectively reduced the brillation.