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  • Chemistry  (9)
  • 1970-1974  (9)
  • 1965-1969
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Keywords
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Study on the pyrolysis of cellulose and its derivatives (1970)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 132 (1970), S. 7-22 
    Details
    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: Es wurde die Kinetik der Pyrolyse von Baumwoll-Cellulose und Celluloseacetat von verschiedenem Substitutionsgrad untersucht. Der Bereich der Zersetzungstemperatur der Celluloseproben nimmt mit steigendem Substitutionsgrad ab, die Stabilität nimmt dagegen mit steigendem Substitutionsgrad zu. Es wird für die untersuchten Proben ein wahrscheinlicher Abbaumechanismus diskutiert. Sowohl für die Zersetzung der Proben als auch für die der Rückstände wurden Aktivierungsenergie und Reaktionsordnung bestimmt und mit DTA-Messungen in Beziehung gesetzt.
    Notes: Kinetics of pyrolysis of cotton cellulose and cellulose acetate with different degrees of substitution have been studied. The range of decomposition temperature of the cellulose samples was found to decrease with the increase in degree of substitution. However, the stability of the polymer increased as the degree of substitution increased. Probable mechanism of degradation of the test samples is discussed. Energy of activation and order of reaction for the decomposition of polymer samples as well as for the residual materials have been determined and correlated with DTA measurements.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1970.021320102
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  • 2
    Electronic Resource
    Electronic Resource
    Twinning in polyacrylonitrile (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 169 (1973), S. 291-300 
    Details
    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: Eine Vielfalt von Polyacrylnitril-Zwillingskristallen wurde nach der Filmbildungsmethode hergestellt. Die Kristalle wurden nach ihrer Entstehungsart klassifiziert. Es wurde gezeigt, daß Zwillingskristalle durch mehrere Mechanismen erzeugt werden können. Der Habitus und die Orientierung der nach verschiedenen Ursprungsmechanismen entstandenen Sekundärlamellen wurden untersucht.
    Notes: A great variety of twinned crystals of polyacrylonitrile (PAN) are grown by Film Formation Method. They have been classified according to their origin. It has been shown that twins of polymer crystals originate by several mechanisms. Habit and orientation of secondary lamellae generated by various mechanisms on twinned crystals have been studied.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1973.021690127
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  • 3
    Electronic Resource
    Electronic Resource
    Action of phenols on the corrosion of 3S aluminium in hydrochloric acid solutions (1973)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 24 (1973), S. 964-966 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Wirkung von phenolen auf die Korrosion von Al 3S in SalzsäurelösungenDie inhibierende Wirkung einiger Phenole auf die Korrosion von Eisen in 0,5 n Salzsäure ist abhängig von der Konzentration und der Konstitution des jeweiligen Inhibitors. Die Wirkung nimmt ab in der Reihenfolge p-Thiokresol 〉 Pyrogallol 〉 Reihenfolge 〉 Phenol 〉 p-Kresol 〉 m-Kresol 〉 o-Kresol. Der geringe Hemmwert der Kresole scheint durch die Elektronendonator-Wirkung der CH3-Gruppen und durch deren Wechselwirkung mit der ebenfalls als Elektrodonator auftretenden OH-Gruppe bedingt zu sein. Die SH- und OH-Gruppen scheinen die Adsorption an den kathodischen Stellen ebenso zu erleichtern, wie es die π-Elektronen des aromatischen Ringes tun.
    Notes: The inhibiting effect of some phenols on the corrosion of iron in 0.5 N hydrochloric acid depends from the concentration and the constitution of the particular inhibitor. The effect decreases in the following order; p-thiocresol 〉 pyrogallol 〉 resorcinol 〉 phenol 〉 p-cresol 〉 m-cresol 〉 o-cresol. The low inhibiting power of the cresols appears to be due to the cresol appears to be due to the electron donating capacity of th CH3 groups and their interaction with OH groups which is an electron donator, too. The SH and OH groups appear to facilitate the adsorption on cathodic sites as do the π-electrons of the aromatic annulus.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19730241106
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  • 4
    Electronic Resource
    Electronic Resource
    Diffusion of gases in poly(methyl methacrylate) (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 158 (1972), S. 65-79 
    Details
    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: Die Diffusion von Helium, Sauerstoff, Stickstoff und Kohlendioxid in Polymethylmethacrylat wurde untersucht. Die erhaltenen Daten wurden nach der von PAUL und DIBENEDETTO modifizierten Methode ausgewertet. Verschiedene thermodynamische Parameter wurden berechnet. Der Mechanismus des Diffusionsprozesses wird diskutiert.
    Notes: Diffusion of helium, oxygen, nitrogen, and carbon dioxide in poly(methyl methacrylate) has been studied. The data are analyzed employing the new modified time-lag technique developed by PAUL and DIBENEDETTO. Different thermodynamic parameters have been evaluated and the mechanism of gaseous diffusion has been discussed.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021580107
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  • 5
    Electronic Resource
    Electronic Resource
    A study on adsorption of poly(methyl methacrylate) on aluminium silicate (1971)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 18 (1971), S. 39-47 
    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: Der Einfluß von Temperatur, Lösungsmittel und Molekulargewicht auf die Adsorption von Polymethylmethacrylat an Aluminiumsilikat und die Kinetik der Adsorption wurden untersucht. Die Geschwindigkeitskonstanten betragen 1,4 · 10-2 bei 30 °C und 1,0 · 10-2 min-1 bei 45 °C. Die Adsorptionsdaten wurden nach Langmuir und Simha-Frisch-Eirich ausgewertet. Zur Deutung der Ergebnisse erwies sich die Langmuir-Isotherme als geeignet.
    Notes: Effect of temperature, solvent power, and molecular weight on the adsorption of poly methyl methacrylate (PMMA) on aluminium silicate has been studied. Kinetics of adsorption have been also investigated at 30° and 45 °C. The values of rate constants at these temperatures are 1.4 · 10-2 and 1.0 · 10-2 min-1 respectively. The adsorption data have been analysed according to the Langmuir and the Simha-Frisch-Eirich (SFE) isotherms. The results could be adequately explained in terms of the Langmuir isotherm.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1971.050180104
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  • 6
    Electronic Resource
    Electronic Resource
    Hedrite growth in polyacrylonitrile (1971)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 20 (1971), S. 197-201 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Hedrite growth has been observed in PAN from its solution in propylene carbonate in the concentration range 0.06% to 0.5%.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1971.050200117
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  • 7
    Electronic Resource
    Electronic Resource
    Doublets of polyoxymethylene and associated growth features (1973)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 31 (1973), S. 161-168 
    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: Ein charakteristisches Dublett- und Triplettwachstum von Polyoxymethylen-Kristallen wird in verdünnter Brombenzollösung beobachtet. Die einfache, aber häufig beobachtete Kristallform und ihr Einfluß auf die Entstehung der gesamtmorphologischen Erscheinungsformen wird erläutert. Es wird herausgestellt, daß die einfache Kristallform hauptsächlich durch einen Schraubenversetzungsmechanismus vielschichtig wird. Gestalt und Orientierung der so auf den Dublett-Kristallen aufgewchsenen sekundären Erscheinungsformen werden diskutiert.
    Notes: A characteristic doublet and triplet growth of polyoxymethylene crystals is observed from the dilute solution in bromobenzene. The simple, but frequently observed crystal structure and its role in developing gross morphological features is illustrated. It is marked that mainly it gets multilayered by screw dislocation mechanism. Habit and orientation of secondary features so developed on the doublets are discussed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1973.050310112
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  • 8
    Electronic Resource
    Electronic Resource
    Morphology of polyacrylonitrile (1972)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 25 (1972), S. 83-96 
    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: Durch Änderung von Konzentration oder Temperatur bei der Kristallisation von Polyacrylnitril aus Lösung in Propylen-carbonat durch die Filmbildungsmethode können - je nach den Bedingungen - bevorzugt Einkristalle, Zwillingskristalle, Hedrithe und Sphärolite erhalten werden. Einkristalle entstehen im Bereich von 105 bis 150°C aus verdännter Lösung und aus konzentrierter Lösung (〉 2,5%) bei höherer Temperatur. Durch Zunahme der Polymerkonzentration wird die Bildung von Garbensphäroliten und Hedrithen erreicht. Die Lamellendicke wächst mit der Kristallisationstemperatur an.Der Vorteil der Filmbildungstechnik liegt darin, daß sie einen weiten Konzentratïons- und Temperaturbereich anbietet, der nicht nur für kinetische Untersuchungen, sondern auch fur das Wachstum von Einkristallen aus der Polymerlösung geeignet ist.
    Notes: The present investigation revealed that the features like: single crystals, twin crystals, hedrites and spherulites could be grown by changing the concentration or temperature of crystallization of polyacrylonitrile (PAN) from its solution in propylene carbonate and following the technique of film-formation method of crystallization. Different stages of growth have been also reported. The well defined single crystals of PAN could be grown in the temperature range of 105 to 150°C, even from the dilute solution. Single crystals of PAN could be also grown from concentrated solution (〉 2.5%) at higher temperature. Formation of spherulites from sheaf and hedrites has been achieved by increasing the concentration of the polymer solution. Lamellar thickness is found to increase with crystallization temperature.The potentiality of the film-formation technique is that it provides an extended range of concentration and temperature not only for the kinetic study but also for the growth of single crystals from polymer solutions.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1972.050250108
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  • 9
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of oxidation of starch with sodium hypochlorite (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 389-399 
    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: Kinetics of heterogeneous oxidation of starch with hypochlorite were studied under varying conditions of temperature, pH, buffer components, buffer concentration, and concentration of substrate and oxidant. The kinetic data show that the reaction is first order with respect to hypochlorite. A plot of first-order rate constant for varying starch concentrations versus starch concentration is linear. The rate of oxidation of starch is highest at pH 7.0 and decreases with increasing acidity or alkalinity of the medium. In unbuffered system, pH of the medium decreases from 10 to 3.4 during the reaction. Based on observed trends of reaction rate, energy, and entropy of activation, a mechanism for hypochlorite oxidation of starch is proposed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070180207
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