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  • Chemistry  (10)
  • 1980-1984  (10)
  • 1981  (10)
Collection
Publisher
Years
  • 1980-1984  (10)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 2 (1981), S. 543-549 
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 231-235 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 93 (1981), S. 352-371 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polymere, die wie Polyacetylen ein ausgedehntes π-Elektronensystem in der Hauptkette haben oder wie Poly-p-phenylen aus einer Folge aromatischer Ringe bestehen, sind im nativen Zustand ausgezeichnete Isolatoren; sie können im festen Zustand zu elektrisch leitfähigen CT-Komplexen mit einer metallähnlichen Leitfähigkeitscharakteristik oxidiert oder reduziert werden. Die chemischen und physikalischen Prozesse, die sich hierbei abspielen, und die Ursachen für die quasimetallische Leitfähigkeit sind noch weitgehend umstritten. Die physikalisch-chemische Realstruktur der Materialien, d. h. ihre komplexe Morphologie und Textur, muß in die Diskussion der Eigenschaften ebenso einbezogen werden wie die Erfahrungen über Struktur-Eigenschafts-Beziehungen bei den „organischen Metallen“, d. h. bei hochleitfähigen Molekülkristallen aus CT-Komplexen niedermolekularer organischer Verbindungen. Die Entdeckung der hochleitfähigen Polymerkomplexe hat ein neues interdisziplinäres Forschungsgebiet eröffnet, das die Polymerwissenschaft, die Festkörper- und Halbleiterphysik und die organische Festkörperchemie beschäftigt. Man darf annehmen, daß sich hieraus zahlreiche neuartige Werkstoffe und technische Anwendungen ergeben werden.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 4 (1981), S. 155-175 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Recent experimental results concerning the crystal structure and morphology of nascent cis-poly-acetylene and pristine trans-polyacetylene are discussed. The unit cell data of cis-PA and two different modifications of trans-PA are reported. The chlorination and the hydrogenation of PA both of which give soluble derivatives under certain experimental circumstances are critically discussed. PA prepared by the Shirakawa technique has a lamellar morphology with some evidence for chain folding and not a fibirillar texture as sometimes assumed. The synthesis and spectral properties of polyenylanions and -cations are reported as a new class of polyconjugated macromolecules. The so-called doping of PA to produce highly conducting phases is explained as a chemical reaction giving rise to intermolecular CT-interaction.Finally, some new experiments concerning the solution properties of polydiacetylenes and the question of effective conjugation length in polyunsaturated polymers are discussed.
    Additional Material: 14 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1033-1045 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis of a series of homologous α-hydro-ω-hydroxyoligo(oxytetramethylene)s, of the corresponding bis(phenylurethane)s, and of α-hydro-ω-chlorooligo(oxytetramethylene)s is described. The purity of the individual oligomers was characterized by gel permeation chromatography and their melting behaviour was investigated. A value of 45 ± 2°C is derived as the equilibrium melting point of poly(oxytetramethylene) from a suitable extrapolation of the melting point of the oligomers to infinite molecular weight.
    Additional Material: 6 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 3639-3651 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The isothermal melt crystallization of three segmented copoly(ether ester)s based on PBT as the hard and PTMO as the soft segments differing in their hard segment content was investigated. The kinetics of crystallization was studied using polarizing microscopy and DSC. Two regimes of crystallization were observed. Spherulitic structures of low crystallinity are formed via predominantly athermal nucleation in regime I at supercoolings ΔTu 〈 30°C. Ill-defined aggregations of lamellae grow at ΔTu 〉 30°C. The crystallization follows an apparent Avrami-equation; the Avrami-constants cannot be explained in terms of a simple model. The structure of the samples was investigated by SAXS and compared to the structure of samples crystallized by rapid quenching and subsequent annealing. Much higher long spacings are obtained on isothermal crystallization. The long spacing increases with decreasing ΔTu. It increases at constant ΔTu with decreasing average hard segment length contrary to the samples crystallized by subsequent annealing of the quenched melt. In this case polymers differing in composition do not differ with regard to the long spacing obtained at constant ΔTu. The modulus in the Hookean-range as derived from stress-strain curves at T 〉 Tg does not reflect the details of the morphology or chain architecture but it is found to depend logarithmically on the volume fraction of crystallinity in the sample. Data of pure PBT are described by the same relationship.
    Additional Material: 9 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 3625-3638 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The supermolecular structure of melt-crystallized segmented copoly(ether ester)s based on poly(tetramethylene terephthalate) and poly(tetramethylene oxide) is investigated by polarizing microscopy and electron microscopic techniques. Spherulites are formed on isothermal crystallization at supercoolings ΔTu 〈 30°C. The spherulites recrystallize to form dendritic structures on further annealing at higher temperatures. The spherulites and dendrites are builtup from lamellae which exhibit little variation concerning the thickness of their crystalline core. The internal phase boundaries in these systems are made visible with a newly developed staining method. A network of interlocked individual lamellae is formed on rapid quenching of the melt films. Row crystallization (shish-kebabs) is observed, if the melt is sheared during the crystallization. It is concluded from these observations that the chemical structure of the segmented copolymers bears little relevance for the supermolecular structure of these materials except for the thickness of the crystalline core of the lamellae which seems to be related to the molecular length of the hard segment sequences occurring with the highest concentration in the sample.
    Additional Material: 13 Ill.
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  • 8
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 9
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 20 (1981), S. 361-381 
    ISSN: 0570-0833
    Keywords: Polymers ; Conducting materials ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polymers such as polyacetylene, which have an extended π-electron system in their backbone, or like poly(p-phenylene) consist of a sequence of aromatic rings are excellent insulators in their native state and can be transformed by oxidation or reduction in the solid state into conductive CT-complexes which exhibit metal-like conduction characteristics. The chemical and physical processes involved and the reasons for the observed quasimetallic conductivity are not yet fully understood. The real structure of these materials in chemical and physical terms, i. e. their complicated morphology and texture, as well as the results available on the structure-property relationships of the “organic metals” must be considered when discussing their properties. In other words, a discussion of conductive polymers should be based on what is known of the highly conducting CT-complexes of low-molecular weight compounds. The discovery of the highly conducting polymer complexes has opened up a new interdisciplinary field of research which borders on polymer science, solid-state and semiconductor physics and on organic solid-state chemistry. It is hoped that this area will lead to numerous novel materials and technical applications.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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