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  • Articles: DFG German National Licenses  (7)
  • 1975-1979  (7)
Source
  • Articles: DFG German National Licenses  (7)
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Crystallization of polyacrylonitrile: Growth mechanisms for various growth features (1976)
    Springer
    Colloid & polymer science 254 (1976), S. 859-867 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die Kristallisation von Polyacrylnitril und anderen Polymeren wird nach der Methode der Filmbildung ausgeführt. Das Polyacrylnitril war hergestellt durch Polymerisation von Acrylnitril initiiert mit einem Cer-Ionen-Redoxsystem. Die Fraktionierung des Polyacrylnitrils wurde mit der Methode, dieKobayashi undFujisaki beschrieben haben, durchgeführt. Die vorliegende Studie für die Untersuchung der wachsenden Kristalle wurde an einer Probe mit dem mittleren Molekulargewicht $$\bar M_w = 1,2 \times 10^5 $$ durchgeführt. Cellulosetriacetat (CTA) mit dem Molekulargewicht $$\bar M_n = 3,5 \times 10^5 $$ , bestimmt aus Viskositätsmessungen in Chloroform bei 25 °C nach Haward und Parikh, wurde ebenso wie Polydthylen (PE), mit $$\bar M_n = 9,9 \times 10^4 $$ aus Viskositdtsmessungen in Xylol bei 90 °C nach Billmeyer, für die Beobachtung des Kristallwachstums verwendet. PE wurde von den Chemischen Werken Hüls (Deutschland) geliefert, CTA durch Acetylierung von Cellulose mit Essigsdure und Essigsäureanhydrid und Perchlorsäure als Katalysator präpariert. Amyloseacetat wurde aus Amylose extrahiert, aus Kartoffelstärke gewonnen.
    Notes: Summary Crystallization of polyacrylonitrile has been carried out at different temperatures from fractionated sample, and different morphological growth features obtained are compared with those observed previously from unfractionated sample. Several new growth features like rectangular single crystals, twinned crystals, ovals and spherulites have been observed. The role of different typical growth features for the development of spherulites has been studied. It seems that the proposed growth mechanism for the development of spherulite grown either from the melt or concentrated solution is the same for different polymers. From the observed growth features of dendritic nature in different conditions, a mechanism of development of dendritic spherulite is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01775410
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Diffusion of gases in cellulose triacetate (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 2531-2539 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Diffusion data of helium, nitrogen, oxygen, and carbon dioxide through glassy cellulose triacetate were obtained and analyzed by the modified time-lag technique of DiBenedetto and Paul. Thermodynamic data were evaluated and a probable mechanism for gaseous diffusion is discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021791017
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic and electrical properties of chelate polymers (1978)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 68 (1978), S. 17-21 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Magnetisches Moment und elekrischer Widerstand von Polyazomethinen, die durch Kondensation von 4,4′-Dihydroxy-3,3′-diacetyl-biphenyl und p-Phenylendiamin hergstellt wurden, sowie von den daraus resulierenden Cu(II)-, Ni(II)- und Co(II)-Polychelaten wurden gemessen. Die Ergebnisse werden diskutiert.
    Notes: The magnetic moment and electrical resistivity of poly(azomethines) (PSB), prepared from the condensation of 4,4′-dihydroxy-3,3′-diacetyl-biphenyl and p-phenylenediamine and its Cu(II), Ni(II) and Co(II) polychelates have been measured. The results are discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1978.050680102
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  • 4
    Electronic Resource
    Electronic Resource
    A study on the synthesis and electrical properties of chelate polymers (1979)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 79 (1979), S. 133-145 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Cu(II), Ni(II) und Co(II)-Chelat-Polymere wurden aus 4,4′-Dihydroxy-3,3′-diacetyl-biphenyl-bisthiosemicarbazon (L-1) und 4,4′-Dihydroxy-3,3′-dipropionyl-biphenyl-bis-thiosemicarbazon (L-2) hergestellt. Der elektrische spezifische Widerstand und das magnetische Moment wurden davon gemessen. Untersuchungen des Hall-Effekts und des Seebeck-Effekts zeigten, daß CuL-1 ein p-Halbleiter ist.
    Notes: Cu(II), Ni(II), and Co(II) chelate polymers of 4,4′-dihydroxy-3,3′-diacetyl biphenyl bisthiosemicarbazone (L-1), and 4,4′-dihydroxy 3,3′-dipropionyl biphenyl bis-thiosemicarbazone (L-2), have been prepared. The electrical resistivity and magnetic moment have been measured. The Hall effect and Seebeck effect studies of CuL-1 have shown it to be a p-type semiconductor, and the mechanism of transport is hopping type.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1979.050790111
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Solutions properties of cellulose triacetate II. Behaviour in binary solvents and temperature dependence of viscosity (1977)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 65 (1977), S. 183-195 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Viskositätszahl von Cellulosetriacetat (CTA) in Mischungen aus Chloroform-Methanol, Chloroform-Butanol, Chloroform-Propanol, Tetrachloräthan-Butanol, Dimethylformamid-Methanol und Nitromethan-Methanol nimmt anfänglich mit steigen-dem Alkoholgehalt zu, um nach Erreichen eines Maximums dann abzufallen, während in Mischungen aus Chloroform-Cyclohexan und Dioxan-Benzol die Werte mit abnehmen-der Lösungskraft steigen. die Polymerkonformation hängt von dem Gehalt an Essigsäure in Polymeren ab. Untersuchungen der Temperaturaturabhängigkeit der Viskosität in reinen und gemischten Löngsmitteln Zeigen, daß sich CTA wie ein steifes Kettenmolekül in der Lösung verhält.
    Notes: The intrinsic viscosity of cellulose triacetate (CTA) in chloroform-methanol, chloroform-butanol, chloroform-propanol, tetrachloroethane-butanol, dimethyl formamide-methanol, and nitromethane-methanol mixtures is found to increase initially with the amounts of alcohols in the mixture, then decreases in each studied system after attaining a maximum value, while in chloroform-cyclohexane and dioxane-benzene systems values are found to decrease with the decreasing solvent power. The type of the polymer conformation in the binary solvents is found to be dependent on the acetic acid content of the polymer. Studies on the temperature dependence of viscosity in pure and mixed solvent systems indicate that CTA behaves as a stiff chain molecule in the solution.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1977.050650113
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  • 6
    Electronic Resource
    Electronic Resource
    A study on adsorption of cellulose-triacetate and cellulose-acetate-butyrate on porous adsorbents (1979)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 78 (1979), S. 109-121 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Einflüsse von Temperatur und Lösungsmittel auf die Adsorption von CTA und CAB auf porösen Adsorptionsmitteln (Calciumsilikat, Aluminiumsilikat und Cellulosepulver) wurden untersucht. Die Adsorption nimmt mit steigender Temperatur zu. Die Adsorptionswärmen (ΔHad) wurden aus den Adsorptionsdaten erhalten. Die Untersuchungen der Adsorption aus verschiedenen Lösungsmitteln zeigten, daß die Polymer-Adsorption von Wechselwirkungen zwischen Polymerem und Adsorptionsmittel und zwischen Polymerem und Lösungsmittel abhängt. Die Adsorptionsdaten wurden nach den Theorien von Langmuir, Simha-Frisch-Eirich, Gilliland und Guttoff, Forsman und Hughes sowie Silberberg dargestellt.
    Notes: The effects of temperature and solvent on the adsorption of CTA and CAB on porous adsorbents (calcium silicate, aluminium silicate, and cellulose powder) have been studied. The adsorption of polymers is found to increase with increase in temperature. The values of heat of adsorption (ΔHad) have been obtained from the adsorption data. The studies of adsorption from different solvents indicated that the polymer adsorption is dependent on two factors: polymer-adsorbent and polymer/solvent interactions. The adsorption data are also treated with Langmuir, Simha-Frisch-Eirich, Gilliland and Guttoff, Forsman and Hughes, and Silberberg theories.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1979.050780108
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Adsorption of polymethylmethacrylate from binary sovent systems (1977)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 62 (1977), S. 177-185 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird über eine Untersuchung der Adsorption von Polymethylmethacrylat auf Aluminimsilikat und Calciumsilikat aus binären Lösungsmitteln berichtet. Die experimentellen Ergebnisse können zufriedenstellend durch Wechselwirkungen zwischen Lösungsmittel und Polymerem bzw. Lösungsmittel und Adsorptionsmittel interpretiert werden.
    Notes: A study on the adsorption of polymethylmethacrylate from binary solvent systems is reported. The adsorbents used are aluminium silicate and calcium silicate. An attempt is made to explain the experimental data in terms of solvent/polymer and solvent/adsorbent interactions and of the cohesive energy density concept. The results are satisfactorily interpreted in terms of solvent/polymer and solvent/adsorbent interactions.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1977.050620114
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