Iodine Sorption Value and Surface Chemical Analysis of Regenerated Cellulosic Fibres

Abstract

The surface chemical analysis and bulk analysis were conducted for fibres regenerated from waste garments and treated with iodine solution. The aim was to assess the fibre accessibility by the iodine solution and ascertain the location of the reagent within the fibres. X-ray Photoelectron Spectroscopy (XPS) analysis indicated that the fibres regenerated from indigo dyed waste denim garments (ReCell-Denim) had a relatively high accessibility by the iodine solution compared to the standard lyocell, ReCell-1 and ReCell-2 fibres. With the exception of ReCell-Denim, the standard lyocell, ReCell-1 and ReCell-2 fibre's iodine sorption values correlated well with the percentage crystallinity. The high accessibility of the ReCell-Denim fibres was attributed to the presence of the positively charged nitrogen from the indigo dyes that improved the substantivity of the fibres to the iodine solution. The iodine sorption of the fibres is relatively higher in the bulk compared to the fibre surface.

Valorization of old corrugated container to dissolving pulp

“…The iodine sorption value (ISV) was determined as described by Nelson et al (1970) and Haule (2016). A total of 0.3 g of dried pulp (OCC, unbleached and bleached one) sample was placed in a beaker.…”

Technical and environmental improvement of the bleaching sequence of dissolving pulp for fibre production

“…Due to the influence of several parameters on the reactivity of dissolving pulp towards viscose, such as the orientation of cellulose (cellulose I parallel or cellulose II, antiparallel) and morphology of the fibre (high porosity, pore volume, thickness of the cell wall or surface area), different methods have been carried out to measure it, such as: iodine sorption (Haule, 2016), NMR spectroscopy (Christoffersson et al 2002), viscose filterability (Gehmayr et al 2011), (Wu et al 2014) and Fock test (Tian et al 2014); (Ibarra et al 2010); (Duan et al 2016). According to Duan et al (2015) the last two analysis have a good correlation between them but, even though Fock's test takes some time to be done, it does not require complex equipment to be performed in comparison with the viscose filterability (Chao et al 2014) and uses a smaller amount of pulp (Köpke, 2010).…”