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  • 1960-1964  (5)
  • 1940-1944
  • 1960  (5)
Material
Years
  • 1960-1964  (5)
  • 1940-1944
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 47 (1960), S. 538-539 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 48 (1960), S. 91-99 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Reactions on the reactive groups of macromolecular substances (e.g., cellulose) have long been known, even since before the structures of macromolecules were understood. H. Staudinger carried out numerous reactions with macromolecules, maintaining the degree of polymerization constant, in order to substantiate the macromolecular structure of the substances investigated (polymeric-analogous reactions). During the last fifteen years reactions with macromolecules have been investigated because it was desirable to compare the chemical diversity of low molecular weight compounds with the corresponding chemical diversity of macromolecular compounds. These endeavors bring forth materials which supplement the numerous macromolecular substances which are produced and used as materials for plastics, and therefore these materials should have as low reactivity and high stability as possible. Objectives are given for the preparation of macromolecules with a large variety of groups. From these objectives it is evident that, as in low molecular weight chemistry, macromolecular substances which possess functional groups of high reactivity are suitable as starting materials. Some of these which have been known for a long time but have been investigated only in recent years are polyaldehydes (polyacroleins and polymethylacroleins), polyacyl halides such as polyacryl chlorides and polyvinylsulfonyl chlorides and fluorides, and, most recently, polymeric organometallic compounds such as poly-p-lithiumstyrene. The reactions with these macromolecules are described and the properties of the resulting new polymeric substances are given.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 48 (1960), S. 399-404 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The cationic polymerization of 1,3,5-trioxane in methylene dichloride with boron trifluoride, producing polyoxymethylene, was investigated. An ionogenic cocatalyst is not required in this polymerization. During the induction period, initially formed, short polyoxymethylene chains depolymerize to formaldehyde until a constant equilibrium concentration of formaldehyde is reached. This concentration is equal to the ceiling concentration of formaldehyde in cationic polymerization under the conditions chosen for the experiments. The nonstationary state and the strong acceleration of the polymerization of trioxane are due mainly to the lack of an effective kinetic termination reaction. Thus the concentration of growing polyoxymethylene cations increases with time.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Dans ce travail des mesures de diffusion de la lumière et de diffusion de translation ont été effectuées sur une série de para-oligophénylènes méthylsubstitués.Les masses moléculaires déterminées par diffusion de la lumière sont en très bon accord avec les valeurs calculées à partir de la formule chimique.L'interprétation des mesures de dépolarisation permet d'affirmer que l'on a affaire à des molécules rigides en forme de bâtonnet.Les constantes de diffusion de translation D de ces corps ont été mesurées. Les valeurs ainsi déterminées sont liées aux masses moléculaires par une relation du Type D = K · M-b où b à pour valeur 0.8.
    Notes: In der vorliegenden Arbeit werden Streulicht- und Diffusionsmessungen an methylsubstituierten p-Oligophenylenen beschrieben. Das aus den Streulichtmessungen ermittelte Molekulargewicht stimmt überraschend gut mit dem aus der chemischen Formel errechneten überein. Aus den Untersuchungen über die Depolarisation des Streulichtes ergibt sich eindeutig, daß es sich bei den untersuchten Molekülen um starre Stäbchen handelt.Es wurde ferner die Diffusionskonstante D dieser Stoffe bestimmt. Die so erhaltenen Werte sind mit dem Molekulargewicht durch die Gleichung D = K · M-b verbunden, wobei für b der Wert 0,8 gefunden wurde.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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