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  • 1
    Digitale Medien
    Digitale Medien
    Reaktion substituierter Hydrazone mit Phosphortrichlorid (1972)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 314 (1972), S. 806-814 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Arylhydrazone von Methylalkylketonen reagieren mit Phosphortrichlorid zu 4-Alkyl-2-aryl-1,2,3-phosphadiazolen 1, deren Struktur durch NMR-, IR-, Raman- und UV-Spektren sowie elektronographisch gesichert wurde. Analog verlaufen die Reaktionen von Acetaldehyd-phenylhydrazon und Aceton-(2-cyanäthyl)-hydrazon mit PCl3.Aceton-acetylhydrazon ergibt mit PCl3 1-Chlor-4-methyl-3-acetyl-1,5-dihydro-1,2,3-phosphadiazol 3, das mit Triäthylamin 4-Methyl-2-acetyl-1,2,3-phosphadiazol 4 bildet. Mit Alkoholen werden aus 3 1-Chlor-4-methyl-2-acetyl-1,5-dihydro-phosphadiazole 5, mit Aminen 4-Methyl-2-acetyl-1-aryl(alkyl)amino-1,5-dihydro-1,2,3-phosphadiazole 6 erhalten.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19723140514
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  • 2
    Digitale Medien
    Digitale Medien
    Polymer-pigment interface: A kinetic consideration (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 12 (1974), S. 455-457 
    Details
    ISSN: 0360-6384
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1974.130120805
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  • 3
    Digitale Medien
    Digitale Medien
    Conditioning polytetrafluoroethylene surfaces for use in vascular prosthesesPresented in part at the 157th National Meeting of the American Chemical Society, Minneapolis, Minnesota, April 13-18, 1969. (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 14 (1970), S. 257-266 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Polytetrafluoroethylene surfaces have been treated to reduce thrombogenicity in order to make them suitable for use in prosthetic devices that come in contact with blood. This was done by first etching the surface with potassium in liquid ammonia to produce double bonds and then using these double bonds as sites for grafting on polyacids or as sites for chemical reactions. Tubes so treated were tested for thrombo-genetic activity by implantation in the thoracic aorta or inferior vena cava of dogs. These tests showed that the thrombogenicity of a polytetrafluoroethylene surface can be reduced by attaching negatively charged groups provided the surface concentration of these groups is not too high (order of 1-2 × 10-6 equivalent per cm2 geometric area) and provided the distribution of these groups is uniform. Sulfonic acid groups obtained by chlorosulfonation and carboxyl groups attached by grafting tert-butyl crotonate and hydrolyzing to crotonic acid were effective. Long chains of poly(acrylic acid), poly-(ethylenesulfonic acid), and poly(vinyl alcohol) sulfate were less effective.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1970.070140201
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  • 4
    Digitale Medien
    Digitale Medien
    Selectivity and kinetics of epoxy resin-bisphenol a reaction catalyzed by certain guanidine derivatives (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 2415-2426 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The reaction of bisphenol A with a diglycidyl ether of bisphenol A may lead to linear polymers if a selective catalyst is used. Selective catalysts promote linear polymer formation while nonselective catalysts increase the rate of crosslinking. Selectivity in epoxy resin-bisphenol A reactions depends upon the nature of the catalyst used. In order to understand these catalyst-structure relationships better, we measured the effects of catalysts on the rate of polymerization (k1) and the rate of crosslinking (k2) during epoxy resin cures. The knowledge of the ratio k1/k2 aids in the selection of catalysts specific for the linear polymerization of epoxy resins. We related this specificity to catalysts basicity. We found that less basic catalysts tend to give large k1/k2 values, indicating that little crosslinking occurs with these highly selective catalysts. We demonstrated that the linear polymer obtained from epoxy resin polymerized by triethanolamine, a very selective catalyst, and the linear polymer prepared using 3-p-chlorophenyl-1,1-dimethylurea, a catalyst with low selectivity, are essentially the same. Finally, we caution that quantitative comparisons of selectivity should be restricted to those reactions whose kinetic reaction orders are the same.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1973.070170808
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  • 5
    Digitale Medien
    Digitale Medien
    Electrochemistry of thrombosis - An aid in the selection of prosthetic materialsSupported in part by Grants in Aid, No's HE 07371, HE 07821 and HE 10795 from NHI, NIH, Bethesda, Maryland. (1970)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 4 (1970), S. 43-55 
    Details
    ISSN: 0021-9304
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin , Technik allgemein
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jbm.820040106
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  • 6
    Digitale Medien
    Digitale Medien
    Antithrombogenic characteristics of cathodically polarized copper prostheses (1972)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 6 (1972), S. 489-498 
    Details
    ISSN: 0021-9304
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin , Technik allgemein
    Notizen: In previous studies from our laboratories, it was shown that metals and alloys which register negative potentials in blood vs. the normal hydrogen electrode (NHE) tend to be antithrombogenic, while those with positive potentials are invariably thrombogenic. Of the metals, only the corrodible ones fall in the first group and the noble ones in the second. Blood compatible metals appear to be essential for some types of medical devices. This paper deals with a novel approach of maintaining an implanted metallic prostheses at a negative potential. A copper vascular prostheses in a dog was made the cathode in a polarizing circuit, which in addition consists of a smal mercury battery, a resistor and an auxiliary electrode. Such experiments were conducted in three animals, and the potentials ranged from -60 to -160 mV/NHE. The three dogs were sacrificed after 6, 8, and 14 days and the tubes were examined. All tubes were free of thrombus deposits; minimal junctional thrombi were found. Two copper tubes with no polarizing circuit and registering positive potentials were occluded after 8 and 14 days, respectively. Histologic and electron-microscopic studies of the thrombus deposits in tubes at spontaneous potentials and of the junctional thrombus deposits in the tube at negative potentials showed similar structures. The present experiments further confirm the view that the potential across the conductive material-blood interface is a more basic parameter than the chemical nature of the surface in determining its blood-compatible characteristic.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jbm.820060603
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  • 7
    Digitale Medien
    Digitale Medien
    The mass spectra of s-triazines (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 863-874 
    Details
    ISSN: 0030-493X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The mass spectra of twenty-one s-triazines have been interpreted. An unusual feature noted in the spectra of some of the compounds is transfer of a hydrogen atom of a side chain to a nitrogen atom of the s-triazine ring; two such shifts are suggested as a rationale for the unusual loss of nitrogen from a hydrazide derivative. The fragmentation of triamino- and some diamino- derivatives indicates that imino tautomers play a significant role. The spectra of aryldiamino s-triazines suggest that the site of a substituent in the aryl ring is important in some cases in directing the decomposition; some transitions have been rationalised on the basis of the juxtaposition of the substituent in relation to a nitrogen atom of the heterocyclic ring.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/oms.1210030704
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  • 8
    Digitale Medien
    Digitale Medien
    Boron-sulphur compounds - II:For Part I, see Ref. 1. A proton magnetic resonance study of complexes of pyridine and γ-picoline with trialkylthioboranes (1972)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 4 (1972), S. 469-471 
    Details
    ISSN: 0030-4921
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Proton magnetic resonance studies of the pyridine and γ-picoline complexes of trimethyl-and triethylthioboranes provide strong evidence that the pπ - dπ bonding in the boron-sulphur bond is much weaker than the pπ—pπ bonding in the boron-oxygen bond.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1270040406
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  • 9
    Digitale Medien
    Digitale Medien
    The mass spectra of 1,2,4-triazines and related compounds (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1085-1092 
    Details
    ISSN: 0030-493X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The mass spectra of monocyclic 1,2,4-triazines and 1,2,4-triazines fused to a pyrazole ring through a bridgehead nitrogen have been investigated: fragmentation pathways were elucidated by the use of metastable ions and high resolution mass measurements. The spectra of the monocyclic 1,2,4-triazines indicate that loss of nitrogen from the molecular ions is a relatively unimportant feature. The decomposition modes of the bicyclic pyrazolo[3,2-c]-as-triazines are sensitive to the nature of the substituent in the triazine ring.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/oms.1210050908
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  • 10
    Digitale Medien
    Digitale Medien
    γ relaxation and its relation to the diffusion of n-C4H10 in polyethylene (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 9 (1971), S. 477-482 
    Details
    ISSN: 0449-2986
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1971.110090702
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