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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 230 (1995), S. 1-12 
    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: Die mit γ-Strahlen induzierte Polymerisation von Methacrylsäure (MA) und Acrylsäure (AA) mit Acrylamid (AAm) (M2) in Substanz wurde untersucht. Die nach Kelen-Tüdős berechneten Copolymerisationsparameter betragen r1 = 1.35 und r2 = 0.22 für MA-AAm bzw. r1 = 1.75 und r2 = 0.10 für AA-AAm. Die Polymerisationsgeschwindigkeit hängt sowohl von der Temperatur als auch von der Comonomerzusammensetzung ab. Die differentialkinetischen Kurven sind unimodal, was darauf hinweist, daß nur der Copolymerisationsprozeß abläuft. Ein zweites Maximum in diesen Kurven wird mit Vernetzung und der Bildung wasserunlöslicher Bestandteile erklärt. Die Copolymeren sind weiße Pulver; die wasserlöslichen Fraktionen sind im Gegensatz zu den wasserunlöslichen nicht giftig, aber als Immunmodulatoren weniger aktiv.
    Notes: A study was made of the γ-radiation-induced bulk copolymerization of the methacrylic acid-acrylamide (M2) (MA-AAm) and acrylic acid-acrylamide (M2) (AA-AAm) monomeric pairs. The copolymerization reactivity ratios deterined according to the Kelen-Tüdő method were: r1 = 1.35, r2 = 0.22 for the MA-AAm pair, and r1 = 1.75, r2 = 0.10 for the AA-AAm pair. It has been established that the polymerization rate depends both on the composition of the starting reaction mixture and on the reaction temperature. The differential kinetic curves obtained are unimodal ones, suggesting the occurrence of only one process, i.e. copolymerization. A second maximum in these curves, appearing at elevated temperature, is explained by crosslinking and formation of a water-insoluble fraction. The copolymers obtained are white powders; in contrast to their water-insoluble fractions, the water-soluble ones are not toxic but they are less active as immunomodulators.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 199 (1992), S. 137-148 
    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: Poly(N-vinylpyrrolidon-co-vinylamin) und Poly(N-vinylpyrrolidon-co-glycidylcrotonatSystematic name: (2,3-Epoxypropyl)crotonate.) wurden mittels Atherton-Todd- und Fields-Kabachnik-Reaktion sowie durch direkte Umsetzung mit Phosphortrichlorid oder Phosphortrichloridoxid phosphoryliert. Zusammensetzung und Struktur der Endprodukte wurden durch 1 H-NMR-, 31 P-NMR- und IR-Spektroskopie sowie elementaranalytisch bestimmt.
    Notes: Phosphorylation of poly(N-vinyl pyrrolidone-co-vinyl amine) and poly(N-vinyl pyrrolidone-co-glycidylcrotonateSystematic name: (2,3-Epoxypropyl)crotonate.) is realized by Atherton-Todd and Fields-Kabachnik reactions and by the means of direct interaction with phosphorus trichloride and phosphorus trichloride oxide. The composition and structure of the isolated final products was proved by NMR (1H and 31P), IR spectroscopy and elemental analysis.
    Additional Material: 9 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 187 (1991), S. 135-142 
    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: Poly(N-vinylpyrrolidon-co-vinylamin) wurde mit Estern verschiedener Phosphorsäuren (Dimethylphosphit, Methanphosphonsäuredimethylester, Trimethylphosphat und Bis-(2-chlorethyl)-phosphonat methyliert, um physiologisch aktive Polymere zu erhalten. Die alkylierten Produkte wurden mittels IR- und NMR-Spektroskopie sowie Elementaranalyse charakterisiert. Der Alkylierungsumsatz hängt vom verwendeten Alkylierungsmittel ab. Die methylierten phosphorhaltigen Polymeren weisen Herbizidaktivität auf und könnten als Pflanzenwachstumshemmer verwendet werden.
    Notes: Alkylation of amino groups bounded to a polymer chain with esters of phosphorous acids was studied in order to obtain physiologically active polymers. Poly(N-vinyl-pyrrolidone-co-vinylamine) was chosen as a polymer-carrier. The phosphorous acid esters used were dimethyl hydrogen phosphonate, dimethyl methanephosphonate, trimethyl phosphate and bis-(2-chloroethyl)-hydrogen phosphonate. The composition and structure of the isolated final products was proved by IR- and NMR-spectroscopy and elemental analysis. It is established that alkylation takes place to various extents.The obtained alkylated phosphorous-containing polymers exhibit herbicidal activity and could find application as plant growth retardants.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Reaction kinetics and catalysis letters 66 (1999), S. 55-62 
    ISSN: 1588-2837
    Keywords: Oxidation of sulfides ; kinetics ; higher Co oxide IR ; XPS ; reaction mechanism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Low-temperature heterogenous oxidation of sulfide ions on a higher Co oxide system in aqueous medium has been studied. The effects of pH, temperature and catalyst amount on the kinetic parameters as well as on the selectivity of the oxidation process were investigated. An oxidation mechanism has been proposed based on the results of kinetic investigations and on the data obtained by IR and XPS spectroscopic studies of Co oxide before and after sulfide ion oxidation.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 66 (1978), S. 1-14 
    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: Copolymers with prolonged growth regulating activity for agriculture were prepared by the copolymerization of acrylamide with vinyl esters of 2,4-dichlorophenoxy acetic acid and 2,4-dichlorophenoxy butyric acid. Some kinetic relations were established. Reactivity ratios for the systems acrylamide-vinyl ester of phenoxyacetic acid (r1 = 4,08 ± 0,08 and r2 = 0,943 ± 0,16) and acrylamide-vinyl ester of 2,4-dichlorophenoxy butyric acid (r1 = 1.50 ± 0,09 and r2 = 1,02 ± 0,18) were determined. Conditions of preparing water soluble copolymers with good yield and sufficient high content of physiologically active units were established.
    Notes: Die Copolymerisation von Acrylamid mit den Vinylestern der 2,4-Dichlorphenoxyessigsäure und 2,4-Dichlorphenoxybuttersäure wurde untersucht in der Absicht, in der Landwirtschaft einsetzbare Präparate mit verlängerter, das Wachsum regulierender ktivität herzustellen. Neben einigen kinetischen Messungen wurden die Copolymerisations-parameer ermittelt. Für das System Acrylamid-Vinylester der 2,4-Dichlorphenoxyessigsäure ergab sich r1 = 4,08 ± 0,08 undr r2 = 0,943 ± 0,16; für das System Acrylamid-Vinylester der 2,4-Dichlorphenoxybuttersäre ergab sich r1 = 1,50 ± 0,09 und r2 = 1,02 ± 0,18. Die Bedingungen, bei denen wasserlösliche Copolymere mit guter Ausbeute bei genügend hohem Gehalt an physiologisch aktiven Gliedern anfallen, wurden ermittelt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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