Fibrillation tendency of cellulosic fibers, part 6: Effects of treatments with additive polymers

Abstract

ABSTRACT:The influences of the treatments with various polymers on fibrillation and abrasion resistances of lyocell materials were investigated with respect to the type of polymer, the polymer concentration, and the drying temperature. Fibril number, generated with agitation using ball-bearings (FN ball ), was decreased with increasing the concentration of aminofunctional polysiloxane because of reduction in water retention capacity (WRV) in fibers. The never-dried lyocell fiber showed smaller decrease in FN ball because of its higher WRV when compared to dried fibers. The treatment with aminofunctional polysiloxane enhanced not only the fibrillation resistance but also abrasion resistance, which was indicated as rotation number of abrasive bar in the abrasion test (RN abr ). No fibrillation was obtained in the fiber treated with 10 g/L aminofunctional polysiloxane at 120°C for 20 min, while the fibers treated at 60 and 170°C for 15 min were fibrillated in the agitation and abrasion tests. The addition of secondary polyethylene derivative also reduced the fibrillation tendency of lyocell; however, the extent of the reduction was lesser when compared with aminofunctional polysiloxane. The treatments with polyacrylate, polyurethane, and polyisocyanate derivatives improved the fibrillation resistance in lyocell fabrics, while fiber abrasion resistance was not significantly improved by the treatment with those additives, except in polyisocyanate.

Effect of moisture on cationic polymerization of silicone epoxy monomers

“…For instance, the curing behavior of the siloxy cycloaliphatic epoxies versus the cycloaliphatic epoxy ester may be influenced by different hydration structures of the siloxy groups versus ester groups in the two monomers. Siloxanes are known to have strong water repulsion properties, and the SE monomer had a five‐fold lower equilibrium, saturated water concentration than EMEC (Table versus Table ).…”

Investigating the influence of yarn characteristics on microfibre release from knitted fabrics during laundering

“…Lyocell fibres have a higher degree of crystallinity than other regenerated cellulose fibres, with highly oriented crystallites aligned parallelly to the fibre axis (Fink et al, 2001;Michud et al, 2016). However, the lateral connections between the crystallites are weak and can be easily broken, especially under wet abrasion conditions (Mortimer and Péguy, 1996;Udomkichdecha et al, 2002;Zhang et al, 2006). This leads to localised separation of crystallites at the fibre surface, leaving partially detached fibrils and a hairy appearance (Parajuli et al, 2021;Sharma et al, 2021;Graupner et al, 2023).…”

Low-temperature and efficient crosslinking of lyocell knitted fabric with an eco-friendly diepoxy agent for fibrillation resistance

“…crosslinker EH at 60 ℃ and different pH values (pH = 2, 4, 6, 8, 10, 12) for 45 min. The in uence of crosslinking temperature (30,40,50,60,70, and 80 ℃) and crosslinking time (10,20,30,40,50,60, and 70 min) on the crosslinking of lyocell knitted fabrics was studied under the condition of 5% crosslinker EH and the pH value of the crosslinking solution kept at 10.…”

“…The number of brils (FN) decreased after the lyocell bers were pretreated with NaOH or KOH solutions (Manian et al 2017; Zhang et al 2005a). The brillation tendency can be reduced by high-temperature curing of lyocell bers/fabrics with amino-functional polysiloxane, polyisocyanate derivatives, polyacrylate, or polyurethane (Zhang et al 2005b).…”