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  • 1
    Electronic Resource
    Electronic Resource
    Polymer induced aggregation of dye moleculesDedicated to Professor Herman Mark at the occasion of his 80th birthday anniversary (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 1 (1975), S. 249-261 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Der Einfluß verschiedener Polysäuren auf die Absorptionsspektren von 7-Methylamino-3-dimethyliminio-3H-phenothiazinchlorid (Trimethylthioninhydrochlorid, Azur B) (1) wurde untersucht. Folgende Polymere wurden eingesetzt: Polyacrylsäure, verschiedene Acrylsäure-Acrylamid- und Acrylsäure-Styrol-Copolymere sowie drei Maleinsäure-Acrylamid-Copolymere. Die spektroskopischen Messungen der Farbstoff-Polymer-Wechselwirkungen zeigten, daß die Farbstoffmoleküle mit der Polymerkette assoziiert sind und daß diese Assoziationen stark abhängig sind von der Copolymeren-Zusammensetzung, vom Abstand zwischen den Carboxylgruppen in der Kette und von der inneren Struktur der Makromoleküle. Bei gleichem Acrylsäuregehalt in verschiedenen Styrol-Acrylsäure-Copolymeren beeinflußt auch die Triadensequenzverteilung die Intensität der metachromatischen Banden, obwohl dieser Einfluß nur von untergeordneter Bedeutung ist, verglichen mit den anderen strukturellen Merkmalen der Copolymeren.
    Notes: The effect of various polyacids on the absorption spectrum of 7-methylamino-3-dimethylimino-3H-phenothiazine chloride (trimethylthionine chloride, Azure B) (1) was studied. The following polymers were used: poly(acrylic acid), several acrylic acid-acrylamide and acrylic acid-styrene copolymers, and three maleic acid-acrylamide copolymers. The spectroscopic measurements of the dye-polymer interactions showed that the dye molecules are associated with the polymer chain and that this association is strongly dependent on the copolymer composition, the distance between the carboxylic groups in the chain, and the internal structure of the macromolecule. At identical acrylic acid content of poly(styrene-co-acrylic acid), the triads sequence distributions affect also the intensity of the metachromatic band, though this influence is only of secondary importance compared to the other structural characteristics of the copolymers.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.020011975117
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  • 2
    Electronic Resource
    Electronic Resource
    Polymer induced aggregation of dye molecules. Influence of the attachment of dye molecules as side groupsPart of the Ph. D. thesis presented by one of the authors (B. S.) to the K. Universiteit Leuven, June 1975. (1977)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 2719-2723 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: By radical polymerization, 7-(N-acryloyl-N-methyl)-3-dimethyliminio-3H-phenothiazine chloride (1) has been transformed in the N-substituted polyacrylamide carrying Azure B side groups, poly{1-[N-(3-dimethyliminio-3H-phenothiazin-7-yl)-N-methylaminocarbonyl]ethylene chloride}. On addition of poly(acrylic acid) dye-polymer interactions and metachromasy phenomena have been examined using absorption spectrometry.Similarly, 1 has been copolymerized with acrylic acid. Intramolecular functional interaction causes a bathochromic absorption band (652 nm) which persists partially on addition of poly(acrylic acid), and affects dye-aggregation and metachromasy.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1977.021780921
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  • 3
    Electronic Resource
    Electronic Resource
    Microrheology of high-polymer solutions (1991)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 29 (1991), S. 677-682 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A new surface force apparatus is used for investigating the viscoelastic properties of high-polymer solutions or polymer melts confined between two solid surfaces. We describe the experimental setup and discuss how to obtain the rheological behavior of the liquid from the transfer function given by two capacitance displacement transducers. In particular, we point out that for a distance between the surfaces enclosing a thin film below some thousands of Angströms, the elastic deformation of the solids is no longer negligible. Experiments conducted on a semidilute solution of polybutadiene show the applicability of the device for study of the dynamic properties of thin-film polymers.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1991.090290605
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Relaxation experiments of polymeric systems confined in very narrow gaps (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 93-102 
    Details
    ISSN: 0887-6266
    Keywords: polymeric systems ; relaxation processes ; solid surface spacing ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A new way of investigating the relaxation processes of polymeric systems confined between solid surfaces is presented here. The test is based on draining experiments by means of a surface force apparatus and consists in monitoring the hydrodynamic force release following a drainage motion. Experiments carried out with solutions of high polymers exhibit two distinct relaxation processes. The longest one is connected to the relaxation of the chains adsorbed onto the solid surfaces and which are pinned in the area of closest distance between the solid surfaces. Its variations as a function of spacing are consistent with the bridging of some macromolecules. The fastest process is connected to the flow of the solvent molecules through the pseudonetwork formed by the adsorbed layers carried by the solid surfaces. These results have been compared favorably with those obtained by oscillatory measurements as far as relaxation time and viscosity are concerned. The accuracy of the experimental relaxation function is not sufficient for describing reasonably the viscoelastic behavior of the confined fluid. © 1996 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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