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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 196 (1992), S. 1-20 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Baumwoll- und Baumwolle/Polyster-Gewebe mit vergleichbarer Strukture wurden mit Lösungen von Dimethyloldihydroxyethylenharnstoff und einem sauren Mischkatalysator in Poly(oxyethylen) (PEG, Mn = 600, 1000 oder 1450 g/mol) getränkt. Die nachfolgende Härtung unter milden Bedingungen ergab Gewebe mit gebundenen und vernetzten Polyolen mit verschiedenen verbesserten Eigenschaften (Wärmeaufnahme und -abgabe, Knitter- und Abriebfestigkeit, Schmutzhaftvermögen, Hydrophilie). Diese Verbesserungen funktioneller Eigenschaften beruhen auf strukturellen Aspekten des Polyols, wie hoher latenter Wärme aufgrund der zum Bruch intra- und intermolekularer Wasserstoffbrückenbindungen benötigten Energie, elastomere und hydrophile Natur des Polymeren in der Fasermatrix. Durch Härten unter mildesten Bedingungen wurden die verbesserten Eigenschaften ohne nachteilige Wirkung auf Weichheit und Luftdurchlässigkeit erreicht. Mit PEG-1000/DMDHEU wurden bezüglich der Ausgewogenheit der Eigenschaften die besten Ergebnisse erhalten. Im Vergleich zu den unbehandelten Geweben zeigten die 100%-Baumwollgewebe die größte Verbesserung der Knitterfestigkeit, teilweise um eine Größenordnung besser als vor der Behandlung.
    Notes: Woven cotton and cotton/polyester blend fabrics of similar construction were treated with solutions of poly(ethylene glycol) (PEG, Mn of 600, 1000 and 1450 g/mol) containing tetrafunctional dimethyloldihydroxyethyleneureaSystematic name: 1,3-Bis(hydroxymethyl)-4,5-dihydroxyimidazoline-2-one. (DMDHEU) and a mixed acid catalyst. Subsequent curing of these fabrics under selected mild conditions produced fabrics containing bound and crosslinked polyols with several improved functional properties (thermal storage and release, flex and flat abrasion resistance, soil release and hydrophilicity). These functional property improvements are due to structural aspects of the crosslinked polyol. These structural aspects are high latent heat due to energy required to break intra- and intermolecular hydrogen bonds and the elastomeric and hydrophilic nature of the polymer in the fiber matrix. When the fabrics were cured under the mildest conditions, these enhanced functional properties were obtained without adversely affecting the softness or hand and the air permeability of these fabrics. Best results were obtained with the PEG-1000/DMDHEU solutions for an overall balance of improved fabric properties. Relative to untreated fabrics, treated 100% cotton fabrics had the most dramatic increase in their flex life, sometimes over an order of magnitude greater than before treatment and curing.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: New methods for the treatment of cotton with acrylamide have been studied which permit the preparation of modified fabrics with relatively high degrees of carboxyethyl substitution. Wet treatment with acrylamide and sodium hydroxide can be used to produce cottons bearing both carboxyethyl and carbamoylethyl ether substituents. Adjustment of reaction conditions controls the amount and ratio of these substituents. The effects of varying the concentrations of the reactants, the time and the temperature of reaction, and the solvent media employed have been determined. Some elucidation of the chemical mechanisms is provided. Previous work has shown that dry heat treatments of cotton impregnated with acrylamide and alkali can be used to produce high carbamoylethyl substitutions with little or no carboxyethyl substitution. The present work provides an extension of the cotton-acrylamide treatment whereby fabrics can be produced with only carboxyethyl or carbamoylethyl groups, or with mixtures of the two.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 371-379 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Modification of a variety of fabric and fibrous surfaces was achieved by insolubilization thereon of crosslinked polythylene glycols (called POLYTHERM) to impart several useful properties: thermal storage and release, improved resiliency and resistance to oily soiling, static charge, pilling, wear life, and marked increases in hydrophilicity among them. Moreover, these improved properties were durable because up to 70% of the crosslinked polyol was retained after 50 launderings. Such modification was achieved by using average molecular weights of the polyols ranging from 600 to 20,000 by crosslinking with polyfunctional methylolamides (such as DMDHEU) in the presence of acid catalysts by a conventional pad-dry-cure textile finishing procedure. The role of crosslink density of the polyol in determining textile properties was determined by evaluation of films derived from crosslinking the polyols and comparison of selected properties.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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