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  • 1
    Electronic Resource
    Electronic Resource
    Deposition of ultrathin films by a withdrawal method
    Amsterdam : Elsevier
    Thin Solid Films 74 (1980), S. 117-127 
    Details
    ISSN: 0040-6090
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6090(80)90446-0
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of polyureas by the method of interfacial polycondensation (1961)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 52 (1961), S. 331-339 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The interfacial polycondensation method is one of the main achievements recently made in the chemistry of high molecular compounds. Its theoretical importance and the expected practical results aroused considerable interest in the method. By its means polyamides, polyesters and polyurethanes have been synthesized. The present report is devoted to a presentation of the results of an investigation into the interfacial synthesis of polyureas. The synthesis was carried out starting from the diamines and phosgene: In this particular case the diamine used was hexamethylenediamine. The reagents were brought in contract in the form of their solutions, namely in aqueous alkali in the case of the amine and in various organic solvents in the case of phosgene. The effect of the solubility of the phosgene solvent in the hexamethylenediamine solvent (water) on the yield and reduced viscosity of the polyureides was investigated. It was found that with increase in solubility both the yield and the viscosity decreased. The influence of the molar ratio of the reagents, of excess NaOH, of the solution concentration, of the duration of reaction, of the temperature, on the degree of polymerization and reduced viscosity of the polymers was also studied. A decrease of the temperature flavors growth of molecular weight. For temperatures between 10°C. and -10°C. the viscosity varies within the limits 0.08 to 0.7.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1961.1205215742
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  • 3
    Electronic Resource
    Electronic Resource
    Photochemistry of fiber-forming polymers. II. Ketone-containing poly(ethylene terephthalates) (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 14 (1976), S. 2791-2796 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly(ethylene terephthalate) copolymers were prepared containing minor amounts of comonomers containing backbone and side-chain ketone groups. The photochemistry of these polymers was studied at 313 nm, both in film and fiber form. It was demonstrated that only the comonomer, dimethyl-γ-ketopimelate (DMKP), gave a copolymer with enhanced sensitivity to ultraviolet degradation in air. Since this sensitivity is reduced in a nitrogen atmosphere, it is suggested that the mechanism involves main-chain scission to form two free radicals by the Norrish type I mechanism, and that recombination of these radicals is reduced by reaction with oxygen. The use of copolymers of this type provides a method for the controlled photodegradation of polyester fibers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.170141118
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  • 4
    Electronic Resource
    Electronic Resource
    Photochemistry of fiber-forming polymers. I. Acrylonitrile copolymers and fibers containing ketone groups (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 483-494 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The inclusion of minor amounts of methyl isopropenyl ketone in polyacrylonitrile and its copolymers with methyl acrylate and vinyl acetate causes the polymer to become sensitive to ultraviolet light in the 290-320 nm region. Both films and fibers show decreases in molecular weight on irradiation which are attributable to C—C bond scission by the Norrish type II reaction. In addition to bond cleavage, decarbonylation occurs, presumably by a type I radical process which also leads to the formation of ketonitrile groups. Fibers spun from such polymers lose most of their tensile strength and elongation after a few months outdoor exposure to natural sunlight, whereas control samples not containing carbonyl groups will retain their strength for much longer periods. Quantum yields both for chain scission and for carbonyl loss in these systems are estimated to be of the order of 0.005.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.170130220
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of alternation in copolymers by the excimer fluorescence method (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 15 (1977), S. 2013-2017 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A novel method has been developed for the determination of the extent of alternation in copolymers in which one of the comonomers contains a fluorescent chromophore capable of intramolecular excimer formation. The ratio of excimer to monomer fluorescence intensity is linearly correlated with the fraction of adjacent fluorescent chromphores to isolated fluophores on the chain. The method is illustrated for the case of styrene-acrylonitrile copolymers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.170150821
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  • 6
    Electronic Resource
    Electronic Resource
    Laser marking in dye-polymer systems (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 24 (1979), S. 1321-1328 
    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: Light-induced marking in dye-polymer systems based on dye diffusion was investigated. It was demonstrated that when a dye film coated on an appropriate polymer substrate is exposed to a laser beam, marked areas are obtained. In the exposed areas the dye melts and diffuses into the substrate and also flows laterally. The dye, when diffused into the polymer, shows altered spectral characteristics, and significant changes of optical densities can occur in the marked areas. A direct optical marking process based on these phenomena is described. Good spatial resolution and adequate marking sensitivities were demonstrated as submicron marks and energy density requirements below 100 mJ/cm2 were obtained.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070240516
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  • 7
    Electronic Resource
    Electronic Resource
    Morphological studies on roll extruded, plasticized composites (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 2259-2266 
    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: A study of the morphologies of polymer/carbon black composites, plasticized with small molecule organics, is presented. Four different plasticizers and three different polymers were used. In all cases, the plasticizers depress the Tg of the polymers. Whereas in some cases the organic small molecule was found to be molecularly dispersed in the polymer matrix, phase separation occurred in other cases beyond a certain composition. In the latter instances, the excess plasticizer formed crystalline aggregates and a depression of the melting point of the plasticizer was observed. The samples were prepared by a process similar to roll extrusion, which causes biaxial orientation of the crystalline aggregates.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070431215
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  • 8
    Electronic Resource
    Electronic Resource
    Synthese von Polyvinylalkohol. IV. Die Hydrolyse des Methylacetat-Methanol-Azeotrops in Gegenwart von Kationenaustauscherharzen in dampfförmiger Phase (1962)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 16 (1962), S. 125-131 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Polyvinylalkohol-Synthese wird als Nebenprodukt, und zwar in beträchtlichen Mengen, Methylazetat als ein Azeotropgemisch mit Methanol erhalten.Die vorliegende Arbeit umfaßt die Untersuchung der Hydrolyse des Methylacetat-Methanol-Azeotrops in Gegenwart von Kationenaustauscherharzen als Katalysatoren, zwecks Rückführung der erhaltenen Essigsäure und des Methanols in den Fabrikationskreis des Polyvinylalkohols.Die mit mehreren strukturverschiedenen Kationenaustauscherharzen ausgeführten Versuche führten zu dem Ergebnis, daß die Polystyrol-Sulfonsäure-Harze eine höhere katalytische Wirksamkeit bei dieser Reaktion aufweisen.Der Einfluß einer bedeutenden Anzahl von Parametern auf den Reaktionsgang wird untersucht.Es werden Betrachtungen über den Reaktionsmechanismus angestellt, welcher gemäß der Meinung der Verfasser an der Oberfläche des Katalysators, unter Mitwirkung von Diffusionserscheinungen der Reaktionspartner stattfindet.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19620160302
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  • 9
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    Ablative optical recording using organic dye‐in‐polymer films (1980)
    American Institute of Physics
    Details
    Publication Date: 1980-06-01
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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  • 10
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    Titanium sulphide nanoclusters formed within inverse micelles (2006)
    Elsevier
    Details
    Publication Date: 2006-11-01
    Print ISSN: 0038-1098
    Electronic ISSN: 1879-2766
    Topics: Physics
    Published by Elsevier
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