Fiber Spinning from Cellulose Solutions in Imidazolium Ionic Liquids: Effects of Natural Antioxidants on Molecular Weight, Dope Discoloration, and Yellowing Behavior

H. Hettegger, J. Zhang, M. Koide, U. Rinner, A. Potthast, Y. Gotoh, T. Rosenau

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

Abstract

Spinning of cellulosic fibers requires the prior dissolution of cellulose. 3‐Alkyl‐1‐methylimidazolium ionic liquids have proven to be suitable solvents for that purpose, but the degradation of cellulose in the spinning dope can be severe. Suitable stabilizers are therefore required that prevent cellulose degradation, but do not adversely affect spinnability or the long‐term yellowing behavior of the fibers. A group of twelve renewables‐based antioxidants was selected for stabilizing 5% cellulose solutions in the ionic liquids and their effects on cellulose integrity, dope discoloration, and aging behavior were tested by gel permeation chromatography (GPC) and ISO brightness measurements. Propyl gallate (a gallic acid derivative), hydroxytyrosol (from olives), and tocopheramines (a vitamin E derivative) performed best in the three test categories, minimizing both cellulose degradation, chromophore formation in the spinning dope, and yellowing upon accelerating aging of the spun fibers. The use of these stabilizers for cellulose solutions in the imidazolium-based solvent system can therefore be recommended from the point of view of both performance and sustainability.

OriginalspracheEnglisch
Aufsatznummer50
FachzeitschriftFibers
Jahrgang10
Ausgabenummer6
DOIs
PublikationsstatusVeröffentlicht - 7 Juni 2022

Fingerprint

Untersuchen Sie die Forschungsthemen von „Fiber Spinning from Cellulose Solutions in Imidazolium Ionic Liquids: Effects of Natural Antioxidants on Molecular Weight, Dope Discoloration, and Yellowing Behavior“. Zusammen bilden sie einen einzigartigen Fingerprint.

Dieses zitieren