Rheologie von Viskose. 3. Zur Rheologie des Naßspinnprozesses bei der Herstellung von Viskosefasern

Fischer, Kristina; Sendner, H.; Buchner, Reimar; Lassmann, L.; Wilke, Martin

doi:10.1002/actp.1985.010360208

Cited by 4 publications

References 6 publications

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Rheologie von Viskose. 4. Rheologische Untersuchungen zur Stabilität des Spinnprozesses bei der Viskosefaserherstellung

et al. 1989

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Die Stabilität des Spinnprozesses wird mit Hilfc rhcologischcr Untersuchungen charakterisiert. Ausgehend vom Bean‐spruchungs‐Dehnungs‐Diagramm zur Beschreibung der Dehndeformation des Fadenbiindels im Naßspinnprozeß wird der Einfluß einer Veranderung technologischer Parameter der Viskosefaserherstellung auf die Spinnstabilitat mit Hilfe des Stabilitatsdiagrammes beurteilt. Die Beeinflussung der Spinnsicherhcit durch eine Vcranderung des Cellulose‐gehaltes der Viskose, dcr Spinngeschwindigkeit sowie des Schwefelsaurcgehaltes des Spinnbades wird aufgezcigt und mit Hilfe des Stabilitatsdiagrammes bewertet. Dabei wird festgestellt, daB bci einer Vcrmindcrung der Spinngcschwin‐digkcit Veranderungen in den tcchnologischen Parametern der Viskoscfaserherstellung einen geringeren EinfluB auf die Spinnstabilitat haben.

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Rheologie von Viskose. 4. Rheologische Untersuchungen zur Stabilität des Spinnprozesses bei der Viskosefaserherstellung

et al. 1989

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On the wet spinning process of viscose fibres

Fischer

Sendner

Buchner

et al. 1988

Progress and Trends in Rheology II

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Thermoreversible Cross-Linking of Maleated Ethylene/Propylene Copolymers Using Hydrogen-Bonding and Ionic Interactions

et al. 2006

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Maleated ethylene/propylene copolymers (MAn-g-EPM) were thermoreversibly cross-linked via a reaction with primary alkylamines of different length, either with an equimolar amount to obtain the amide−acid or with an excess to obtain the amide−salt, which was confirmed using Fourier transform infrared (FTIR) spectroscopy. Small-angle X-ray scattering (SAXS) experiments showed the presence of microphase-separated aggregates for both the starting MAn-g-EPM and all alkylamide−acids and −salts, which act as physical cross-links. The materials could easily be remolded at 80 °C into homogeneous films for several times without changes in the FTIR spectra, indicating that the (physical) cross-links are truly reversible. The tensile properties and elasticity were improved by converting MAn-g-EPM to the amide−acids due to hydrogen bonding and even further by converting the amide−acids to the amide−salts due to additional ionic interactions besides hydrogen bonding. Better tensile properties and elasticity were observed for the octadecylamine, which was explained by packing of the long alkyl tails in a crystalline-like order. Apparently, this packing is rather ill-defined, since a scattering peak could only be observed in the SAXS patterns of material modified with a large excess of octadecylamine after processing above 140 °C. Irreversible imide formation occurred for all amide−acids and amide−salts at high temperatures, resulting in disappearance of the aggregates and, hence, a dramatic decrease in mechanical properties. Therefore, these temperatures should be avoided during the (re)processing. Replacement of the excess of alkylamine with a different base, viz. potassium hydroxide, resulted in prevention of imide formation at high temperatures and a further improvement in mechanical properties.

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Rheologie von Viskose. 3. Zur Rheologie des Naßspinnprozesses bei der Herstellung von Viskosefasern

Cited by 4 publications

References 6 publications

Rheologie von Viskose. 4. Rheologische Untersuchungen zur Stabilität des Spinnprozesses bei der Viskosefaserherstellung

Rheologie von Viskose. 4. Rheologische Untersuchungen zur Stabilität des Spinnprozesses bei der Viskosefaserherstellung

On the wet spinning process of viscose fibres

Thermoreversible Cross-Linking of Maleated Ethylene/Propylene Copolymers Using Hydrogen-Bonding and Ionic Interactions

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