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  • Artikel  (12)
  • Chemistry  (6)
  • Organic Chemistry  (3)
  • rheological properties  (3)
  • diblock copolymer solution  (2)
  • Bone  (1)
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  • Artikel  (12)
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  • 1
    Digitale Medien
    Digitale Medien
    Rheological investigation of aqueous solutions of poly(vinyl alcohol) during aging III. Effect of the thermal prehistory of the polymer on the process of aging of concentrated solutions (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 903-907 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Polyvinylalcohol ; aging ; preheating of polymer ; rheological properties ; concentratedsolutions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract The paper deals with aging of concentrated poly(vinyl alcohol) solutions prepared from polymer samples which, prior to dissolution, were heated at various temperatures in an aqueous suspension or in the powder state. The effect of preheating is discussed on the basis of changes in viscosity and normal stress difference, measured during aging.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01421819
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  • 2
    Digitale Medien
    Digitale Medien
    A bone resorbing substance from bovine serum albumin (brA) (1978)
    Springer
    Calcified tissue international 25 (1978), S. 233-240 
    Details
    ISSN: 1432-0827
    Schlagwort(e): Bone ; Bone resorption ; Albumin
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Notizen: Summary A fraction (brA), which causes resorption of fetal rat bones in vitro, has been concentrated from bovine serum albumin by anion exchange column chromatography on DEAE Sephadex. This active fraction has also been prepared using DEAE Sephadex A-50 by a batch method with a 0.09M NaCl, 0.1M TRIS buffer, pH 8.35. BrA was 10–30 times more potent than the original albumin. The retained material, which constitutes the bulk of the protein and has less activity than the original albumin, elutes with 0.45M NaCl. Similar treatment of serumα,β or γ globulins does not yield brA. Further enhancement of the bone resorbing activity of brA can be obtained with (NH4)2SO4 fractionation or extraction with CH3OH∶CHCl3. Heating at 55° C for 2 h or at 100° C for 10 min does not affect the activity; overnight incubation with protease destroys the bone resorbing effect. The bone resorbing activity is not removed by dialysis and does not correlate with the protease activity of the fraction. The action of brA is inhibited by 3 mM PO4, 1 μg/ml calcitonin or glucagon, 10−7 M dexamethasone or 0.02 μg/ml actinomycin D. The bone resorbing activity of brA is partially inhibited by 10−7–10−5 M indomethacin. PTH did not elicit bone resorption when added to cultures incubated in chemically defined medium supplemented with 0.1 mg/ml brA. However, brA did not inhibit PTH-induced resorption.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02010775
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  • 3
    Digitale Medien
    Digitale Medien
    A rheological investigation of aqueous solutions of poly (vinyl alcohol) during aging. Part IV: Repeated aging of concentrated solutions (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 1066-1068 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Poly (vinyl alcohol) ; concentrated solutions ; repeated aging ; rheological properties
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract Aging of aqueous solutions of poly (vinyl alcohol) obtained by melting of gels, formed in the aging process from solutions prepared by the dissolution of the polymer in hot water, was investigated using non-Newtonian viscometry and normal stress measurement. It was shown that, if the gels undergo melting at the same temperature at which the original solutions were prepared, aging of such solutions proceeds in the same way as in the case of the original solutions. If melting occurred due to heating at lower temperature, the resulting solutions aged more quickly.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00652869
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  • 4
    Digitale Medien
    Digitale Medien
    Properties of a drag reducing micelle system (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 542-547 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Surfactant ; micelle structure ; drag reduction ; rheological properties
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract Rheological properties of a drag-reducing surfactant were investigated with the intention to find out the influence of shear rate and the duration of shear straining on the Shear Induced Structure. The ability of the surfactant to restore the broken drag-reducing network after the decrease of shear stress is well known. This property of reversible change caused by high shear at different flow conditions was compared to a more intensive mechanical straining by means of ultrasound. Observations using electronmicroscope and spectrometer are also presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00653219
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  • 5
    Digitale Medien
    Digitale Medien
    Viscoplastic flow and shear thickening in concentrated diblock copolymer solutions (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 480-489 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Plastic flow ; shear thickening ; diblock copolymer solution ; rotational rheometry ; micelle system
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract Concentrated (typically 6%) solutions of a polystyrene-polyisoprene diblock copolymer in low viscosity paraffinic solvents form a micelle system by precipitating the polystyrene blocks, whereas the polyisoprene blocks are in solution. Besides viscoplastic behavior without thixotropy, this system exhibits a pronounced shear thickening in steady-state shear flow. The micelles are stable up to shear rates of more than 105 s−1. The properties of the solutions, especially the shear-thickening behavior, depend on the thermal history of the samples as well as on the solvent properties and are sensitive to flow field disturbances occurring in rotational viscometer devices with a profiled surface structure as commonly used to avoid wall slip in dispersed materials. The shear thickening is found to be related to the formation of a long-range ordered structure which also gives rise to the yield point. This long-range order enables aggregate flow with less energy dissipation at low shear rates. Shear-induced break-up of the aggregates appears as a shear-thickening transition which is observed in different types of flow fields.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00656893
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  • 6
    Digitale Medien
    Digitale Medien
    A new type of visco-plastic flow curve observed in certain concentrated diblock copolymer solutions (1986)
    Springer
    Rheologica acta 25 (1986), S. 389-396 
    Details
    ISSN: 1435-1528
    Schlagwort(e): Polystyrene-polyisoprene copolymer ; diblock copolymer solution ; viscometric flow ; plastic flow curve ; shear thickening
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Abstract A diblock copolymer of styrene and isoprene (hydrogenated) is dissolved in C11/C12 n-paraffins and o-xylene (or cyclohexane) mixtures. An unusual type of flow curve is obtained in certain ranges of composition and under certain conditions of preparation. With increasing shear rates, the flow curve is first of the Bingham type, followed by a sudden shear thickening at almost discrete rate of shear and then by a second branch of almost linear increase. Time independent and reproducible behaviour can be achieved. A linear model is proposed and the possible molecular arrangement that corresponds to this model is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01331510
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  • 7
    Digitale Medien
    Digitale Medien
    Computer simulation of the conformational properties of retro-inverso peptides. II. Ab initio study, spatial electron distribution, and population analysis of N-formylglycine methylamide, N-formyl N′-acetyldiaminomethane, and N-methylmalonamide (1983)
    New York : Wiley-Blackwell
    Biopolymers 22 (1983), S. 1901-1917 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Ab initio minimal and split-valence basis set calculations have been performed on compounds that are involved in retro-inverso modifications, i.e., gem-diaminoalkyl and malonyl structures. These calculations are compared with empirical force field calculations and the minor differences discussed. All calculations agree that the preferred helical conformation of the isolated gem-diaminoalkyl and malonyl derivatives of residues found in the retro-inverso modified peptides is 5-8 kcal/mol lower than the Ceq7 conformation preferred by the isolated peptide residues. Population analysis and contour plots of the charge distribution are used to help explain the differences between the model compounds.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.360220807
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  • 8
    Digitale Medien
    Digitale Medien
    Dimethyl-(β-acetoxyäthyl)-sulfonium-chlorid, das Schwefel-analogon des Acetyl-cholin-chlorids (1942)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 25 (1942), S. 907-911 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19420250514
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  • 9
    Digitale Medien
    Digitale Medien
    Chemische Konstitution und antiplasmodische Wirkung. (6. Mitteilung). Über einige heterocyclische Derivate des 8-Amino-chinolins und des 6-Methoxy-8-amino chinolins (1943)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 26 (1943), S. 1180-1185 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19430260421
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  • 10
    Digitale Medien
    Digitale Medien
    Bewitterung von schwermetallfreien PVC-fensterprofilenVortrag anläßlich des 19. Donauländergespräches über “Athmosphärische Alterung und Stabilisierung von Polymeren” in Prag (Tschechoslovakei) vom 24. - 29. Juli 1989 (1990)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 176 (1990), S. 185-195 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Es wird das Bewitterungsverhalten von Blei/Barium/Cadmium-bzw. Barium/Cadmium-stabilisierten Profilen mit neuentwickelten, schwermetallfreien Profilen, sogenannten HMF Profilen verglichen.Die Bewitterungsprüfung erfolgte in Freien, im Xenotest 450, QUV(A), und QUV(B). Verfolgt wurden die farbmetrischen Werte (ΔE, ΔL, ΔA, ΔB) und der Glanzverlust in Abhängigkeit von der Bewitterungsdauer. wahrend im QUV(B) fur die Praxis unbrauchbare Ergebnisse erhalten wurden, korrelieren die QUV(A) Gesamtfarbdifferenzergebnisse sehr gut mit den Freibewitterungsergebnissen. Die HMF stabilisierten Profile sind im Oberflächenangriff den Standard Blei/Barium/Cadmium-Profilen gleichwertig, wenn nicht überlegen. In der Farbmetrik verhalten sich die neuentwickelten HMF Profile gleichwertig den Blei/Barium/Cadmium Standardprofilen.
    Notizen: The weathering behaviour of lead/barium/cadmium-respectively barium/cadmium-stabilized profiles has been compared with new developed profiles which are free from heavy metals, the so-called HMF profiles.The weathering tests have been made out doors, in Xenotest 450, QUV(A), and QUV(B). The colourmetric values (ΔE, ΔL, ΔA, ΔB) and the loss of brightness were measured in dependence of weathering time. The results of QUV(A) measurements were not suitable for practical application, but the findings of the total colour difference of QUV (A) measurements correlate very well with the results of out door weathering. With respect to the surface attack HMF-stabilized profiles are equivalent to the lead/barium/cadmium standard profiles or even superior. The colourmetric behaviour of the new developed HMF profiles is equivalent to the lead/barium/cadmium standard profiles.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1990.051760116
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