Abstract:
Four samples of commercial cellulose triacetate were fractionated by both fractional precipitation and gel permeation chromatography. The mechanical properties of fibres from both triacetate fractions and blends were determined on an Instron tensile tester. A fraction of Dp 76, will not form a coherent filament, fractions of higher Dp showed a rapid improvement of mechanical properties with increase in Op, but above 385 further improvement was slight. A fraction with a Dp of 800 was virtually unspinnable. In contract, at any given number average Dp, within the range studied, the properties of the fractions are the same as those of blends, and furthermore those blends which contain fractions of low or very high molecular weight (Dp), are inferior to those which do not. Mechanical properties of triacetate fractions and blends increased with increasing draw ratio but the per cent elongation was greatly reduced. Electron scanning microscopic studies mode on triacetate fibres showed that tensile properties reported here were a function of Dp. rather than the spinning variables.
Page(s):
52-57
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Scientific and Industrial Research, Volume: 28, Issue: 1, Year: 1985