ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Asymmetric inclusion polymerization of the prochiral monomers (E)- and (Z)-2-methyl-1,3-pentadiene (3a and 3b), in apocholic acid (2) canals was performed under various conditions to find out the factors controlling the asymmetric induction during the polymerization. Ozonolysis of the resulting polymers and subsequent transformation of the resulting 2-methyl-4-oxovaleric acid (4) into its 2,4-dinitrophenylhydrazone revealed the predominant formation of the (R)-absolute configuration. The optical yield was high in the initial stage of the polymerization and decreased gradually as the polymerization proceeds. To obtain a high optical yield the polymerization was performed at low temperature applying a 1:1 mole ratio monomer/apocholic acid, and an irradiation dose 〈 1 Mrad. The optical yield amounted to 36% at maximum, which is the highest value obtained so far in the asymmetric polymerization of 1,3-pentadiene derivatives using canal complexes or other known methods.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 3,4-Methylenedioxybenzyl methacrylate (3) was synthesized from 3,4-methylenedioxybenzyl alcohol (2) and methacryloyl chloride. 3 was radically polymerized with tributylborane and copolymerized in cyclohexanone at room temperature under nitrogen. The following monomer reactivity ratios were determined M1 = 3: r1 = 0,68 and r2 = 0,40 for M2 = styrene, r1 = 0,78 and r2 = 0,16 for M2 = acrylonitril, and r1 = 0,28 and r2 = 1,47 for methyl methacrylate. Polymeric derivatives having 3,4-dihydroxybenzyl units in the side chains were prepared from homo- and copolymers of 3. The thermal stability and redox behaviour of these polymers were investigated.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 30 (1984), S. 945-951 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The rates of desorption of carbon dioxide from supersaturated water solutions into pure carbon dioxide or nitrogen gas stream were measured at 15,25, and 35°C in a baffled agitated vessel with a flat gas-liquid interface operated in a continuous manner. The volumetric liquid-phase mass transfer coefficients for the bubbles generated in the agitated liquid and the enhancement factors of the volumetric liquid-phase mass transfer coefficient for the free liquid surface due to the bubbling were calculated from the measured desorption rates and correlated as functions of the relative supersaturation of the solution and the liquid-phase Reynolds number.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 102 (1982), S. 9-16 
    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: Es wurde die Herstellung von Cellulosemembranen aus Celluloselösungen in einem Gemisch von Paraformaldehyd, nicht protonischem, polarem, organischem Lösungsmittel und einem basischen Katalysator untersucht. Die dichtesten Membranen wurden mit Dimethylsulfoxid als Lösungsmittel erhalten, wobei die Dichte der Membranen bei einem Zusatz von Triethylamin zunahm.
    Notes: The preparation of cellulose membranes from mixtures of cellulose, nonprotonic polar organic solvents, paraformaldehyde, and basic catalyst was studied. When dimethyl sulfoxide was used as casting solvent, the resulting membrane was the densest. An increase of an additional amount of triethyl amine used as basic catalyst gave denser membranes.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    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 Adsorption von Jod an Chitosan wurde mit physikalisch-chemischen Methoden untersucht. Die Rasterelektronenmikroskopie von Chitosan-Jod-Addukten zeigte, daß Jodmoleküle gleichmäßig an einen Chitosan-Film adsorbiert wurden, wenn der Film mit wäßriger Jod-Kaliumjodid-Lösung behandelt wurde. Die thermogravimetrische Analyse der Addukte zeigte, daß der Gewichtsverlust bei 190°C begann und daß die Jodmoleküle gut mit Chitosan komplexiert waren. Die IR-Spektren der Chitosan-Filme zeigten die Amidbanden I und II, die durch die Jodadsorption zu geringeren Frequenzen verschoben wurden. Röntgenbeugung an den Addukten zeigte, daß das Chitosan, das Jod adsorbiert hatte, keine kristallinen Anteile aufwies. Im Gegensatz dazu zeigte das ursprüngliche Chitosan bis zu einem gewissen Grad Kristallinität. Das durch Eintauchen in eine wäßrige Thiosulfatlösung vom Jod befreite Chitosan war amorph.
    Notes: The adsorption of iodine on chitosan was studied by physico-chemical methods. The scanning electron micrograph measurements of chitosan-iodine adducts showed that iodine molecules were adsorbed uniformly on the chitosan film when the film was treated with aqueous iodine-potassium iodide solution. The thermogravimetric analysis of the adducts revealed that the loss in weight began at about 190°C, and that iodine molecules were thus well-complexed with chitosan. It was also found that the IR spectra of the chitosan films showed the amide I and amide II bands shifted to lower frequencies due to the iodine adsorption. The X-ray diffractometry of these adducts was further carried out, and it was found that the iodine adsorbed chitosan showed no crystalline pattern, different from that of the original chitosan which showed crystallinity in some extent. The chitosan recovered after desorbing iodine by immersion in aqueous sodium thiosulfate solution was amorphous.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    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 Adsorption von Brom an pulverisiertem Chitin, Chitosan und an pulverisierter Cellulose wurde in einer wäßrigen Brom-Kaliumbromidlösung bei 30°C untersucht. Chitosan zeigte eine ausgezeichnete Fähigkeit, Brom und Jod zu adsorbieren. Der Chitosanfilm hat die Fähigkeit, Brom in Methanol und in wäßriger Kaliumbromidlösung zu adsorbieren.
    Notes: The adsorption of bromine onto powdery chitin, chitosan and cellulose was studied in an aqueous bromine-potassium bromide solution at 30°C. Chitosan was found to show an excellent ability of adsorbing bromine as well as iodine. The chitosan film also exhibited high ability of adsorbing bromine both in methanol and in aqueous potassium bromide solutions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Currently, one of the major clinical problems is diagnosis of inherited metabolic disorders in neonates which are caused by a defect of specific enzymes. In order to diagnose such diseases at an earlier stage, we have developed a new mass screening method, consisting of a gas chromatography mass spectrometry computer system with a newly developed ‘Diagnosis Computer Program’. In this program, the chromatographic pattern of the urine of a patient with an inherited metabolic disorder is compared with that of a normal person. Internal standards are applied to simplify the comparison. The total ion current chromatogram is drawn with the relative retention times plotted on the horizontal axis and the relative intensities on the vertical axis. Diseases are diagnosed by characteristics and quantity of abnormal compounds in the urine. Reference to the stored mass spectra of abnormal compounds by a library search enables the diagnosis to be more precise. Using this program, twenty-six inherited metabolic disorders are routinely diagnosed. The diagnosis of tyrosinosis is used here as an example.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 1475-1484 
    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: The derivatives of poly(chloromethylstyrene) resin (PCMS) with N-methyl-N-carboxylmethyl-dithiocarbamate (1), N,N-di(β-hydroxyethyl)dithiocarbamate (2), N-methyl-N-carboxylmethylamino (3), and di(β-hydroxyethyl)amino (4) groups were prepared, and the metal ion reactivity of the polymer resins with these functional groups were investigated. Additionally, the effect of γ irradiation on the reaction with metal ion was also investigated. In the reaction of PCMS under the same conditions, the substitution ratio order is as follows: (2) 〉 (1) 〉 (4) 〉 (3). In the reaction of the resins with cupric ion, the reaction amount reached a maximum of 4.17 mequiv/g for resin (1) and 4.75 mequiv/g for (2). The polymers containing sulfur atom have a large reactivity toward metal ion in comparison to the polymers without sulfur atom. The reactivity of polymer (1) toward metal ions decreased in the following order: Ag(I) ≫ Cu(II)〉 Zn(II) ≳ Ni(II) ≳ Co(II). The other metal ions, except Ag(I) and Cu(II), hardly reacted with polymer (2). Thus, polymer (2) has a remarkable selectivity. It was also found that the reaction amount of polymers containing sulfur after γ irradiation is almost the same as that before γ irradiation.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 271-276 
    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: The copolymerization of glycidylmethacrylate-methylmethacrylate-divinylbenzene in cyclohexane was studied as an example of crosslinking precipitation copolymerization. The resultant copolymer is fine spheroidal. The copolymerization proceeds acceleratively at first, then steadily, and gradually slows down. The larger the divinylbenzene concentration, the smaller is the copolymerization rate. Glycidylmethacrylate is preferentially incorporated in the copolymer.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...