Mechanismus der Entwicklung des Knittervermögens vernetzter Cellulosefasern

Abstract

The article describes the mechanism of crease resistance and crease recovery for synthetic and cellulosic fibres. The possibilities of introducing crease recovery properties into cellulose fibres are discussed and specific experimental work to the problem is presented.
In this work we attempted to open the structure of cellulose fibres by partial methylation, hydroxyethylation, and by Michael addition of acrylamide. It was hoped that by the accessibility introduced by these premodifications, we could alter the effect of subsequent wash-wear finishing.
Although the studies covered a much wider range of degree of substitution than previously reported, no technically interesting effects could be observed.
However, the observation that substitution with the non-reactive methyl groups causes a much greater decrease in dry crease recovery than the introduction of the reactive hydroxyethyl substituents supports strongly the hypothesis of the importance of interlaminar cross links for the dry crease recovery. The carbamoethyl groups have an intermediate effect, reflecting their lower reactivity in the cross-linking reaction.
In all the cases, premodification slightly favours the achievement of wet crease recovery, for which apparently intralaminar or intrafibrillar binding is essential. The cross-linking responsible for wet crease recovery seems not to be hindered by the introduction of either substituent.