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  • 1995-1999  (3)
  • 1965-1969  (3)
Materialart
Erscheinungszeitraum
Jahr
  • 1
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 0021-9304
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin , Technik allgemein
    Notizen: To improve the surface blood compatibility on a cellulose hemodialysis membrane, a blood compatible polymer with a phospholipid polar group, poly[2-methacryloyloxyethyl phosphorylcholine(MPC)], was immobilized on the surface through the coating of a water-soluble cellulose grafted with poly(MPC) (MPC-grafted cellulose, MGC). The MGC was synthesized by graft copolymerization of MPC on a water-soluble cellulose using cerium ion as an initiator. The coating process on the cellulose membrane with and aqueous solution of the MGC was convenient, and the MGC on the surface was not significantly detached even after immersion in water. The permeability and mechanical strength of the membrane coated with the MGC did not decrease compared with the original membranes. The MGC-coated cellulose membrane was blood compatible, as determined by the prevention of platelet adhesion and aggregation after contact with platelet-rich plasma. From these results, it is concluded that the MGC may be a useful material for improving the blood compatibility of the cellulose hemodialysis membrane. © 1995 John Wiley & Sons, Inc.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 0021-9304
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin , Technik allgemein
    Notizen: To improve the blood compatibility of a segmented polyurethane (SPU), phospholipid polymer, i.e., 2-methacryloyloxyethyl phosphorylcholine (MPC) copolymerized with cyclohexyl methacrylate or 2-ethylhexyl methacrylate, was blended into SPU as a polymeric additive. The blending was achieved by a solvent-evaporation technique from a homogeneous solution containing both the SPU and the MPC polymer. Surface analysis of the SPU membrane blended with the MPC polymer (SPU/MPC polymer membrane) revealed that the MPC polymer was concentrated at the surface of the SPU membrane which contacted the substrate, Teflon®, compared with that which contacted air during the membrane-formation period. The dispersion state of the MPC polymer in the SPU membrane was evaluated in detail by staining the MPC unit with osmium tetraoxide. When sonication was applied during preparation of the mixed solution containing SPU and the MPC polymer, the dispersion of the MPC polymer in the SPU membrane was different from that without sonication. That is, the size of the domains of the MPC polymer became smaller but the number of the domains increased. The amount of the MPC polymer mixed with SPU affected the dispersion state. Plasma proteins adsorbed on the SPU/MPC polymer membrane surface after contact with human plasma were detected by gold-colloid-labeled immunoassay. Both albumin and fibrinogen were observed on the SPU membrane; however, the amount of these proteins was reduced on the SPU/MPC polymer membrane. Thus it was concluded that the blood compatibility of the SPU was effectively improved by the blending of the MPC polymer. © 1996 John Wiley & Sons, Inc.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 97 (1966), S. 128-138 
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Die Copolymerisation von Methacrylsäuremethylester mit dem Glycidester derselben Säure und die Kinetik der Reaktion des Copolymeren mit sekundären Aminen wurden untersucht. Die Reaktionsfähigkeit dreier Modellsubstanzen und des Copolymeren wurden verglichen. Die Modellverbindungen zeigten eine isokinetische Beziehung; die isokinetische Temperatur betrug 331°K.
    Notizen: The copolymerization of methyl methacrylate with glycidyl methacrylate and the kinetic of the reaction of copolymer with secondary amines were investigated. Three model compounds of the copolymer were prepared in order to compare their reactivity with that of copolymer. It was found that these compounds have an isokinetic relationship and the isokinetic temperature was 331°K.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 86 (1965), S. 73-79 
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Eine kinetische Untersuchung der Reaktion zwischen Epoxydgruppen und Aminen wurde mit Acrylnitril-Glycidylacrylatcopolymeren und Modellverbindungen durchgeführt. Bei 70°C wurden Di-n-butylamin und Diäthanolamin mit Dimethylformamidlösungen der Epoxydverbindungen umgesetzt. Bei der Reaktion der Modellverbindungen und der Copolymeren, die kleine Mengen an Glycidylacrylat enthielten, wurde eine Kinetik 2. Ordnung beobachtet. Bei den Copolymeren war in den meisten Fällen die Reaktion jedoch sehr komplex, und es war unmöglich, sie quantitativ zu behandeln. Ein höherer Nitrilgehalt der Modellverbindung oder der Copolymeren verursacht eine Steigerung der Reaktionsgeschwindigkeit. Ein Nachbargruppeneffekt von Nitril- und Hydroxylgruppen auf die Reaktivität der Epoxydgruppen der Copolymeren wurde beobachtet.
    Notizen: A kinetic approach to the reaction between epoxy groups and amines has been made with acrylonitrile-glycidyl acrylate copolymers and model compounds. The reaction has been carried out at 70°C. in a dimethylformamide solution by using di-n-butylamide and diethanolamine. Second-order kinetics has been observed in the reaction of model compounds and the copolymer containing a small amount of glycidyl acrylate. Whereas, in most cases of copolymers, the reaction has been very complex and it has been impossible to treat it quantitatively. An increase in nitrile content of the model compounds and copolymers caused an increase in the rate of reaction. It has been observed a neighboringgroup effect of nitrile and hydroxyl group on the reactivity of the epoxy group of the copolymers.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 1185-1193 
    ISSN: 0449-2951
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Styrene was polymerized in ceric salt-alcohol redox systems and hydroxyl endgroups on the polystyrene obtained were characterized quantitatively by the spectrophotometric determination of the polymer treated with p-phenylazophenyl isocyanate. A series of polymerization of acrylamide initiated in redox systems of ceric salt and various alcohols was studied as a model system for graft copolymerization onto cellulose. From studies of the rate of polymerization it was shown that the grafting was likely to occur at hemiacetal and 1,2-glycol units. The cellulose-styrene graft copolymer was isolated from the reaction products by a selective extraction technique and characterized by acetolysis of the cellulose backbone. The graft copolymers obtained were found to be a mixture of block and graft copolymers.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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