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  • Polymer and Materials Science  (33)
  • Physics  (7)
  • 1975-1979  (28)
  • 1970-1974
  • 1965-1969  (5)
  • 1950-1954
  • 1978  (28)
  • 1968  (5)
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  • 1975-1979  (28)
  • 1970-1974
  • 1965-1969  (5)
  • 1950-1954
Year
  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 2671-2673 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 6 (1968), S. 299-306 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The predominant role of van der Waal interactions in determining the helical conformations of a simple synthetic linear polymer, as well as helical polypeptides, was pointed out in systematic studies by Liquori et al.1,2. In the case of homopolypeptides the conformational analysis carried out on the basis of a simple semiempirical function describing the van der Waal pairwise interactions between the non directly bonded atoms lead to the conclusion that only five helices are allowed (Rα, β, γ, δ, Lα).2,3In view of the close similarities with poly-L-alanine, we have investigated by x-ray and conformational analysis the molecular conformation of poly(S-lactic acid) which has recently been described by Kleine and Kleine4 and Schuls and Schwaab5 and studied in solution by Goodman and D'Alagni.6 In fact, this polymer may be related to the polypeptide by the interchange of a peptide bond with ester bond along the main chain. This operation is expected to involve only a relatively small change in the steric interaction within the possible helical conformation, but obviously rules out any possibility of hydrogen bonding.
    Additional Material: 8 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 17 (1978), S. 897-908 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pyridoxal Schiff bases of the polypeptides poly(L-lysine), poly(L-ornithine), and poly(L-α,γ-diaminobutyric acid) were prepared and investigated in water/methanol by CD spectra and equilibrium dialysis experiments. Only the poly(L-α,γ-diaminobutyric acid) derivative is characterized by a relevant optical activity similar to that found in pyridoxal enzymes. The stereospecific interactions between the pyridoxylideneimine group and the polypeptide chain prevent the hydrolysis reaction of the aldimine bond.
    Additional Material: 9 Ill.
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  • 4
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Monodisperesed, N-and C-Protected homo-oligopeptides [number (n) of resides from 2 to 5] of L-valine, L-isoleucine, and L-phenylalnine were studied by ir absorption spectroscopy between 1200 and 350 cm-1 at various solvents. The solvents and chain-length effects were examined for non-hydrogen-bonded peptide groups. The frequencies of the self-associated species are consistent with a model derived from the amide data. Self-association species are consistent with a model derived from the amide data. Self-association is favored by higher values of n = 2, the peptide is insoluble when more than two chains are bonded. For n = 3, 4, several chains may be associated by sliding along one another and remain soluble. For n = 2, the peptide is insoluble when more than two chains are bonded. For n = 3, 4, several chains may be associated by sliding along one another and remain slouble. For n = 5, the effect of n is to favour a model in which two chains exactly face each other so that the peptide precipitates at relatively low concentration.
    Additional Material: 6 Ill.
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  • 5
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dynamic mechanical behaviour of polyamide systems containing different degrees of unsaturation was analyzed. The results do not show any simple relation between unsaturation and mechanical response. Particular attention was given to the α-transition, that is a glass transition, and experimental data suggest that the generally accepted mechanism for this transition requires a more extensive study.
    Additional Material: 3 Ill.
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  • 6
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Schiff's bases of ortho-, meta- and para-hydroxybenzaldehydes with poly(L-α,γ-diaminobutyric acid) and poly(L-lysine) were investigated in solution of methanol and methanol-water mixtures by circular dichtroism, absorption spectroscopy and equilibrium dialysis techniques. The results so far obtained allow us to propose a molecular model, which fully justifies the stereospecific binding of ortho-hydroxybenzaldehyde with the polypeptide chain; moreover it is able to explain the dramatic change of the chemical equilibrium in the hydrolysis reaction.
    Additional Material: 7 Ill.
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  • 7
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(β-1,4-D-mannose)Commonly named mannan. was isolated from cell walls of the alga Codium decorticatum by methods proved to preserve its native degree of polymerization. The intrinsic viscosities obtained on native mannan nitrates from algae harvested in different years possess values [η]≈440ml.g-1 with a maximum deviation of 9%, independent of the year of harvest and the age of the cell walls. Osmotic measurements on one of these samples resulted DPn = 375. Fractionation experiments on the same material revealed a nearly monodisperse chain length distribution. The notable independence of the degree of polymerization from the growth conditions and the age of the plants together with its monodispersity let assume a biopolymerization mechanism which is controlled genetically and not by the time of synthesis.
    Additional Material: 2 Ill.
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  • 8
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dynamic mechanical properties of ethylene/propylene copolymers prepared by soluble catalysts based on vanadium salts and alkylaluminium compounds were investigated. The properties of the copolymers were found to depend not only on the chemical composition, but also on the polymerization temperature and on the stereoregulating character of the catalyst. The mechanistic implications of these findings are discussed.
    Additional Material: 4 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 1855-1859 
    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.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 19 (1968), S. 782-785 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Simple method for the potentiostatic determination of teh pitting potential in one single experimentA simple and fast method is described for the determination of the pitting potential of stainless steels. By using wire electrodes to which a constant DC-potential is applied one may scan potential ranges of any size in one single experiment. Tests with four autenitic steels in 1 N NaCl have shown that addition of Mo and Si displaces the pitting potential to higher values at room temperature; at higher temperature, however, this effect vanishes. Addition of NaBr and NaJ to the NaCl-solution produces a considerable increase of the pitting potential of Mo-free stainless steels. The experimental principle can be used also for the investigation of stress corroison cracking.
    Notes: Es wird eine einfache und schnelle Methode zur Ermittlung des ochfraßpotentials von nichtrostenden Stählen beschrieben. Durch die Verwendung von Drähten als Meßelektroden, an die eine festliegende gleichspannung angelegt wird, kann in einem einzigen Versuch ein beliebig großer Potentialbereich geprüft werden. Versuche mit 4 austenitischen Stählen in 1 n NaCl zeigen, daß Mo und Si das Lochfraßpotential bei Raumtemperatur anheben; dieser Effekt geht jedoch bei höherer Temperatur verloren. Zusäte von NaBr und NaJ zur NaCl-Lösung führen zu einer beträchtlichen Zunahme des Lochfraßpotentials von molybdänfreien nichtrostenden Stählen. Das Versuchsprinzip kann auch zur Unter suchung von Spannungskorrosion verwendet werden.
    Additional Material: 6 Ill.
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