HECOL170 Lecture Notes - Lecture 16: Rayon, Lyocell, Viscose
13 Jul 2018
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Document Summary
Rayon fibres: regenerated or precipitated cellulose is rayon, but where that bre has been made by a: Viscose process - viscose or viscose rayon may be used. Modi ed viscose process so that it has a high wet modulus van be modal or modal rayon. Solvent extrusion process, where no chemical intermediated are formed, can be lyocell or lyocell rayon: rayon bres are 100% cellulose, regenerated cellulose: Regenerated (gone into another chemical state where it hasn"t been 100% cellulose but turned back) into cellulose again. Or precipitated - was never not cellulose, back into cellulose: distinction between other rayons and lyocell, variations of rayon exist by modi cations in processing. Viscose, modal, cuprammonium, lyocell: cuprammonium not really made anymore because it is not environmentally friendly process, hydrophilic (water-loving, generally weak bres tend to be weaker when wet (unlike natural cellulosic bres) Modal rayon can be similar in strength as cotton.
