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  • 1
    Electronic Resource
    Electronic Resource
    1.3-Dipolare Cycloadditionen, XXVIII. Diphenylnitrilimin und arylkonjugierte Alkene (1967)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 100 (1967), S. 1593-1601 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Styrol liefert ausschließlich 1.3.5-Triphenyl-†2-pyrazolin (2); elektronen-liefernde oder -anziehende Kernsubstitution ändert die Eindeutigkeit der Orientierung nicht (3-6). Bei Anethol un dβ-Isopropyl-styrol werden beide Additionsrichtungen beschritten (7-10). Dies gilt auch für %bT-Methoxy-, β-Brom- udn β-Nitro-styrol; die aus der HX-Eliminierung hervorgehenden Gemische von 1.3.5- und 1.3.4-Triphenyl-pyrazol (11, 12) werden analysiert. Die Orientierung bei der Anlagerung an kernsubstituierte Stilbene verrät nur geringe elektronische Substituentenwirkung. 1.1-Diephenyl-äthylen liefert ausschließlich 1.3.5.5-Tetraphenyl-Δ2-pyrazolin (19); auch mit C-Phenyl-N-[2.4.6-tribrom-phenyl]-nitrilimin läßt sich die zweite mögliche Additionsrichtung nicht erzwingen.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19671000526
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  • 2
    Electronic Resource
    Electronic Resource
    1.3-Dipolare Cycloadditionen, XXV. Der Nachweis des freien Diphenylnitrilimins als Zwischenstufe bei Cycloadditionen (1967)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 100 (1967), S. 60-70 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rasche Folgereaktionen vereitelten bislang die Isolierung substituierter Nitrilimine. Benz-phenylhydrazid-chlorid (3) tauscht nur in Anwesenheit von Triäthylamin mit Triäthylammoniumchlorid-36Cl das Chlor aus. Identische Orientierungsverhältnisse bei Cycloadditionen an Zimtsäure-methylester bzw. Crotonsäure-methylester sowie übereinstimmende Konkurrenzkonstanten bei der Umsetzung mit Dipolarophilen-Paaren beweisen das Auftreten ein und derselben Zwischenstufe bei folgenden Reaktionen: Thermolyse und Photolyse des 2.5-Diphenyl-tetrazols (1), Umsetzungen von Benz-phenylhydrazid-chlorid (3) mit tert. Amin sowie von [α-Nitro-benzyliden]-phenylhydrazin (8) mit Triäthylamin und Natriumjodid. Nur das freie Diphenylnitrilimin genügt den strukturellen Anforderungen.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19671000108
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  • 3
    Electronic Resource
    Electronic Resource
    A description and working recommendation for using a modified galvanic cell oxygen electrode (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 10 (1968), S. 693-697 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260100516
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  • 4
    Electronic Resource
    Electronic Resource
    Viscosity and normal stresses in branched polydisperse polymersPresented in part at the 63rd National AIChE Meeting, St. Louis, February, 1968. (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 1887-1902 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The steady-flow behavior of five samples of branched poly(vinyl acetate) has been studied with the Weissenberg rheogoniometer. The branching densities and molecular weight distributions were known from an analysis of the polymerization kinetics. Measurements were made on concentrated diethyl phthalate solutions (0.170 and 0.225 g/ml) at temperatures of 30 and 70°C. The viscosities of all solutions at zero shear rate were less than of solutions of linear poly(vinyl acetate) with the same weight-average molecular weight. The amount of decrease was in excellent agreement with Bueche's theory of melt viscosity in branched systems. The viscosity versus shear rate curves were surprisingly independent of molecular weight distribution, the data from all samples being superimposable on the same master curve. Relaxation times derived independently from the viscosity behavior and the normal stress data were of similar magnitude and always close to the Rouse relaxation time of each solution.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.160061105
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  • 5
    Electronic Resource
    Electronic Resource
    Stability of helical polyamino acids in solution at high temperaturesReported in abbreviated form in the abstracts of the 50th Annual Meeting of the Fedaration of American Societies for Experimental Biology, Atlantic City, N.J., April 1966. (1967)
    New York : Wiley-Blackwell
    Biopolymers 5 (1967), S. 193-202 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Optical rotatory dispersion studies have been carried out at temperatures up to 150 °C. on poly(γ-benzyl L-glutamate) in α-chloronaphthalene and N-methylcaprolactam, and on poly-ε-carbobenzoxy-L-lysine, poly-δ-carbobenzoxy-L-ornithine, and poly(L-glutamic acid) in N-methylacetamide. The Moffitt-Yang -b0 values were large in all cases, but significant decreases in -b0 were observed at the upper temperature limits of the study suggesting that a transition region was being entered. Polymer degradation generally precluded examination of the systems through the suggested transition region.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1967.360050207
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  • 6
    Electronic Resource
    Electronic Resource
    Helix-random chain transitions of polyamino acids in organic acid-salt solutionsPresented in part at the 150th meeting of the American Chemical Society, Atlantic City, September 1965. (1966)
    New York : Wiley-Blackwell
    Biopolymers 4 (1966), S. 637-651 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polyamino acids which are soluble and helical in acetic acid and dichloroacetic acid (DCA) have been observed to undergo a helix to random chain transition upon the addition of lithium salts of strong acids. The transition can be reversed by diluting the salt. Apparently only lithium cations are able to bring about the polycarbobenzoxy-L-lysine (PCBL) transition in acetic acid, whereas the anions display a varying degree of effectiveness; ClO4- 〉 Br- 〉 TSA- 〉 Cl- 〉 NO3-. The lithium salts of carboxylate anions such as OAc- and TFA- do not cause polymer unwinding in acetic acid. Neither do the acids, TSA, HCl, TFA, or DCA induce the transformation in acetic acid. Poly-L-alanine (PLA) in DCA unfolds as LiBr is added, but does not unfold in the presence of 0.5M (CH3)4NBr, 0.25M CsBr, or 0.32M HCl. These results are explained on the basis of a direct interaction of the lithium salt with the polymer amide groups to form an ion-pair complex. The extent to which the union of the ion pair can dissociate from the complex in the low dielectric constant, environment determines the degree of unfolding of the polymer. The anion dissociation equilibrium presumably therefore would lie in the same order as given above. Acids such as HCl and TSA are considered to substantially protonate and ion-pair with the polymer, but do not readily dissociate the anion partner from the complex, and therefore do not produce an unstable positively charged helical structure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1966.360040604
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  • 7
    Electronic Resource
    Electronic Resource
    Helix-coil transition of poly(L-glutamic acid) in N-methylacetamide (1969)
    New York : Wiley-Blackwell
    Biopolymers 8 (1969), S. 433-448 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The folding of randomly coiled poly(L-glutamic acid) to the helical state has been studied in N-methylacetamide by titration methods. Since this solvent would be expected to form amide-peptide group hydrogen bonds with the unfolded form of the polymer, to a first approximation no helix stabilization could come from intrapolymer hydrogen bonds. The titration data, collected from 30 to 70°C yield the following values per residue for the thermodynamic parameters governing the coil-helix reaction for the uncharged polymer: ΔG30°C°, -1. 9 ± 0.1 kcal; Δ H°, 0 ± 0.1 kcal; ΔS30°C°, 6.3 ± 0.6 eu. In N-methyl acetamide, the helix is an order of magnitude more stable than in water, and this stabilization appears to be entirely the result of the entropy gained by solvent molecules which are released from the polymer upon folding.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1969.360080402
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  • 8
    Electronic Resource
    Electronic Resource
    Hyperfiltration studies. III. Effect of certain metal ions on the salt filtration properties of cellophanesPrevious paper see Kraus et al.1 (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 10 (1966), S. 969-979 
    Details
    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 salt rejection properties of cellophanes are substantially increased, and permeation rates decreased, by pretreatment with certain metal ions or presence of these ions at low concentration in feed solutions. In a typical case, a cellophane which initially rejected about 20% of salt from a 0.05M NaCl solution rejected over 70% in Presence of 10-3M ThCl4. Permeation rates were decreased, usually be a factior of 2 or 3. Additives found to have a marked effect were Fe(III), Th(IV), U(VI), Cu(II), and hydrolyzed pb(II). Mg(II), Ba(II), La(III), and unhdrolyzed Pb(II) had little effect. The mechanism by which the additives affect the cellophane is not clear.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1966.070100702
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  • 9
    Electronic Resource
    Electronic Resource
    Influence of structure of 1,1,3-trimethyl-5-carboxy-3-(p-carboxyphenyl)indan upon polyamide properties (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 2195-2207 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Copolyamides of nylon 66 and 1,1,3-trimethyl-5-carboxy-3-(p-carboxyphenyl)indan (PIDA) were prepared by melt polycondensation of nylon 66 salt with PIDA in combination with hexamethylenediamine, trans-1,4-cyclohexanebis(methylamine), and m-xylylenediamine. In addition, hexamethylenediamine-PIDA was incorporated into the copolymer system of nylon 66-poly(hexamethylene terephthalamide). The effect of PIDA upon the intrinsic viscosity, crystallinity, density, melting point, moisture regain, tenacity, initial modulus, and the boiling-water shrinkage of such polyamides was determined. Particular emphasis was placed upon the influence of PIDA on the glass transition temperature of the polyamides. The effect of moisture on the glass transition temperature was also discussed. The physical properties of PIDA copolymers indicate that crystallinity virtually disappears above 20 mole-% PIDA concentration; however, the glass transition temperature measured at 0 and 30% RH increases sharply with increased PIDA concentration.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.150070816
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