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  • 1
    Electronic Resource
    Electronic Resource
    The role of iron in carbonium ion reactions of ferrocene derivatives
    Amsterdam : Elsevier
    Tetrahedron Letters 1 (1960), S. 1-8 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(01)99311-6
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrogen bonding in β-aryl ethanols
    Amsterdam : Elsevier
    Tetrahedron Letters 1 (1959), S. 1-7 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(01)99445-6
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and thermal stability evaluation of end-capped nylon 4 oligomers (1984)
    Springer
    Polymer bulletin 11 (1984), S. 229-236 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary End-capped dimers, trimers, and tetramers of nylon 4 were prepared by stepwise synthesis using the p-nitrophenyl active ester coupling method. By thermal gravimetric analysis and gas chromatography, it was found that all of the oligomers studied are thermally unstable and decompose upon heating into pyrrolidone. The rate of oligomer decomposition was found to vary with the nature of the end group; maximum thermal stability was observed for a tetramer having acetoxy and n-propylamido end groups. The results indicate that linear sequences of γ-aminobutyryl units are inherently thermally unstable and have a strong tendency to revert into the thermodynamically more stable pyrrolidone ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255345
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  • 4
    Electronic Resource
    Electronic Resource
    Investigations on the role of acyl initiators and CO2 in nylon 4 polymerization (1985)
    Springer
    Polymer bulletin 14 (1985), S. 527-534 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The preparation of high molecular weight nylon 4 with alkali metal pyrrolidonate catalysts, acyl initiators, and CO2 was studied. Isolated sodium pyrrolidonate and the appropriate amount of acyl initiator gave unusually high molecular weight nylon 4 (mw 〉200,000). The molecular weight-initiator concentration relationship indicates that acyl compounds play a dual role in the polymerization, acting both as initiators and scavengers for chain-terminating impurities. One potential chain terminator was identified as 4-aminobutyric acid. The high polymer molecular weights obtained in the presence of CO2 can also be explained by the scavenging of chain terminators by CO2. Determination of the number of growing chains, however, shows that CO2, unlike the acyl compounds, is not an initiator in nylon 4 polymerization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00271611
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  • 5
    Electronic Resource
    Electronic Resource
    Stereospecificity and electric polarization in high polymers (1960)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 42 (1960), S. 151-157 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The electric polarization of a polymer is shown to depend upon the steric order along the chain. This is in accord with the previously observed electric polarization behavior of diastereomers. Solution measurements of the molar polarization of polymethyl methacrylates in benzene gave values of 32 ± 0.5 cc./mole for syndiotactic, and 41 ± 0.5 cc./mole for isotactic material, with atactic polymer showing intermediate values. It is believed therefore that the polarizability method can form a means of differentiating and interpreting the behavior of polar stereospecific polymers.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1960.1204213917
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  • 6
    Electronic Resource
    Electronic Resource
    Structure of poly(maleic anhydride) (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 14 (1976), S. 1797-1807 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The bulk polymerization of maleic anhydride initiated with acylperoxides, di-tert-butyl peroxide, AIBN, or pyridine proceeds with evolution of CO2. The amount of CO2 generated depends on the nature and the concentration of the initiator. With peroxide initiators, less than 5% of the polymerized maleic anhydride is decarboxylated. 1H-NMR spectra, obtained on the benzoyl peroxide-initiated polymer and its methyl ester, are consistent with the unrearranged poly(maleic anhydride) structure and rule out the polycyclopentanone structure proposed by Braun and co-workers. Base-initiated polymaleic anhydride is substantially decarboxylated, and the resulting polymer has anhydride and carboxyl groups. Elemental analyses and 1H-NMR spectra obtained on the pyridine-initiated polymer and its methyl ester refute both the cis-poly(vinylene ketoanhydride) structure suggested by Schopov and the polycylopentanone structure proposed by Braun and co-workers.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.170140719
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  • 7
    Electronic Resource
    Electronic Resource
    The absence of CO2 in nylon-4 prepared with KOH+ radioactive CO2 catalystPresented at the Meeting of the American Chemical Society, New York, August 1981. (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 2341-2344 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.170200835
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  • 8
    Electronic Resource
    Electronic Resource
    Hydrocarbon-soluble alkylaniline/formaldehyde oligomers as corrosion inhibitorsPresented at the Second Euro-American Conference on Functional Polymers and Biopolymers, Oxford, United Kingdom, September 1989. (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 2435-2441 
    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: Hydrocarbon-soluble oligomers were prepared by the acid-catalyzed condensation of alkylanilines with formaldehyde. Highest molecular weight oligomers (MW ∼ 6000) were obtained from alkylanilines prepared by the Friedel-Crafts alkylation of aniline with α-olefins. By NMR, it was shown that the oligomers contain structures corresponding to methylene-linked aromatic rings and methylene linked to both an aromatic ring and a nitrogen atom. The oligomers exhibit very good initial inhibition of metal corrosion in aqueous environment; and the inhibition is more persistent than that observed with monomeric analogs.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420909
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  • 9
    Electronic Resource
    Electronic Resource
    Chlorinated poly(vinylidene fluoride) (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 1523-1531 
    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: Chlorinated poly(vinylidene fluoride) (PVF2) was prepared by introducing chlorine gas into a CCI4 suspension of PVF2 at reflux temperature. Polymer crystallinity and softening point decrease, while solubility and adhesion increase with the degree of chlorination. In contrast to PVF2, the chlorinated polymer is soluble in low-boiling common organic solvents, such as acetone, methyl ethyl ketone, and 1,2-dimethoxyethane. Chlorinated PVF2 is resistant to dehydrochlorination and is thermally more stable than PVF, chlorinated PVF, PVC, or chlorinated PVC. Chlorinated PVF2 coatings on wood, prepared by solution casting at room temperature, show outstanding weathering resistance.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1980.070250801
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  • 10
    Electronic Resource
    Electronic Resource
    High activity mixed metal alkyl cocatalysts for α-olefin polymerizationPresented at the Meeting of the American Chemical Society, Anaheim, California, September 1986. (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 35 (1988), S. 321-326 
    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: High activity α-olefin polymerization catalysts are generally obtained by mixing MgCl2-supported TiCl4 (MgCl2/TiCl4) with an aluminum trialkyl cocatalyst. Surprisingly, AlEt2Cl, which is the preferred cocatalyst in polymerizations employing nonsupported Ti compounds, is a poor cocatalyst when used with MgCl2/TiCl4. It was found that in propylene and 1-butene polymerizations, using different MgCl2/TiCl4 catalysts, the cocatalyst activity of AlEt2Cl can be greatly improved by the addition of a magnesium or lithium alkyl. The mixed metal alkyl obtained from AlEt2Cl and MgBu2 is a particularly effective cocatalyst always yielding more polymer, of about the same stereospecificity, than the conventional aluminum trialkyls. The exact nature of the mixed metal alkyl cocatalysts is not known, but the available evidence argues against in situ aluminum trialkyl formation resulting from the alkylation of AlEt2Cl by the second metal alkyl.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070350204
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