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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1987-1990 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 3179-3183 
    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: Ausgehend von der Reaktion zwischen Säurechloriden und Aminen, wurden zwei Techniken zur Herstellung von Propf- und Blockcopolymeren entwickelt. Bei der ersten Methode wurde ein Polymethylmethacrylat, (PMMA), das Chlorformylgruppen enthielt mit 2,2′-Azodiisobutyramidin (1) oder 2,2′-Azobis[2-(2-imidazolin-2-yl)propan] (2) zu cinem polymeren Initiator umgesetzt, der bei der thermischen Aktivierung in Gegenwart von Acrylamid - je nach der Position der Chlorformylgruppen an der PMMA HauptketteProp+oder Blockcopolymere ergab. Bei der zweiten Methode wurde ein PMMA, das eine endständige Chlorformylgruppe enthielt, mit einem Polyacrylnitril, das zwei Amidin-Endgruppen enthielt, zu einem Blockcopolymeren umgesetzt.
    Notes: Based on the reaction between acid chlorides and amines, two techniques were developed to prepare graft and block copolymers. In the first method poly(methyl methacrylate), (PMMA), containing chloroformyl groups was reacted with 2,2′-azodiisobutyramidine (1) or 2,2′-azobis[2-(2-imidazolin-2-yl)propane] (2) to give a polymeric initiator which, on thermal activation in the presence of acrylamide, produced graft and block copolymers, according to the position of the chloroformyl group on the PMMA backbone. In the second method, PMMA containing one terminal chloroformyl group was directly reacted with polyacrylonitrile containing two terminal amidine groups to produce a block copolymer.
    Additional Material: 1 Tab.
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  • 3
    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: Ethylene oxide was polymerized with potassium 4-(phenylazo)benzylalcoholate (1f). The purified and fractionated products were acylated. The ultra-violet measurement of the end groups showed a large excess of hydroxyl end groups compared with the initiator end groups. Number average molecular weights (M̄n) could be derived from the content of the different end groups. The comparison with osmotically determined M̄n-values and viscosity average molecular weights (M̄η) confirms the supposed structure of polyethylene oxide.
    Notes: Äthylenoxid wurde mit Kalium-4-(phenylazo)benzylalkoholat (1f) polymerisiert, die gereinigten Produkte fraktioniert und anschließend acyliert. Die UV-photometrische Bestimmung der Endgruppen ergab, daß HO-Endgruppen, verglichen mit den Starterendgruppen, in großem Überschuß vorhanden waren. Aus den Endgruppenwerten ließen sich Zahlenmittel des Molekulargewichts (M̄n) ableiten. Sie wurden mit osmotisch bestimmten M̄n-Werten und Viskositätsmittel (M̄η)-verglichen und bestätigten die angenommene Struktur der Polyäthylenoxide.
    Additional Material: 3 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 3619-3623 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 24 (1979), S. 1977-1984 
    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: The dielectric relaxation data of the constituents of natural resin shellac have been analyzed by the Cole-Cole method at temperatures between 10° and 90°C in the frequency range of 50 Hz to 500 kHz. The functional groups present in hard and soft lac appeared to be responsible for the dielectric properties exhibited by shellac below and above its glass transition and melting temperature, respectively. A combination of 70% hard lac and 30% soft lac was found to exhibit the dielectric properties of shellac satisfactorily.
    Additional Material: 4 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 14 (1970), S. 999-1005 
    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: The use of surface tension measurements is proposed as a simple method for the determination of copolymerization ratios. The procedure depends on the parachor of the copolymer in the liquid state (∏), which is defined by ∏ = ∏s + ∏0(wp/ws)(Ms/M0) for solutions and ∏ = [DP]∏0 for liquid or molten polymers, where ∏s is the parachor of the solvent of molecular weight Ms; wp and ws are the weights of the polymer and solvent in solution; while ∏0 and M0 are the parachor and molecular weight of the repeating unit of the copolymer, respectively. The validity of this relationship is demonstrated by analysis of the surface tension properties of liquid silicone polymers, polystyrene-Decalin solutions, and molten polymers as well as by the calculation of the composition of some characterized tetrahydrofuran-propylene oxide copolymers. The application of surface tension measurement is also suggested as a means of estimating the degree of chain branching in a polymer.
    Additional Material: 4 Tab.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 529-537 
    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: The Cole-Cole method has been applied for an analysis of the dielectric relaxation data of the natural resin shellac, obtained by Bhattacharya in the temperature range 20-110°C. Three relaxation processes were observed for temperatures 20-60°C. At 70°C, two relaxation processes were noticed, whereas only one was observed by Bhattacharya between 20 and 110°C. The relaxations at 80°C and above represented typical Cole-Cole type. The variation of the static dielectric constant with temperature revealed three distinct slopes, which indicated different phases of the resin during its thermal transition from solid to liquid state. Two “transformation points,” around 40 and 70°C were noted, i.e., the glass transition temperature and melting point of the resin, respectively. Significant changes in static dielectric constant, dielectric increment, relaxation time, and Cole-Cole distribution parameter were observed during a rise of temperature from 80 to 110°C. The results of the present study indicate that some rearrangement in the teriary disposition of the resin molecules takes place during the rise of temperature from 20 to 110°C.
    Additional Material: 5 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 47 (1975), S. 71-71 
    ISSN: 0009-286X
    Keywords: Ellis model ; parallel plates ; constant heat flux ; constant wall temperature ; Nusselt number ; average temperature ; Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 46 (1974), S. 863-863 
    ISSN: 0009-286X
    Keywords: Ellis model ; constant wall temperature ; constant heat flux ; Nusselt number ; bulk temperature ; Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 757 (1972), S. 23-32 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Sesquiterpenoids of the Ground Ivy (Glechoma hederacea L.)Two chemical races occur with Glechoma hederacea: The so-called Glechomafuran (1) is responsible for the chromogenous behaviour of one race. The race which does not respond to EP-reagent contains the so-called Glechomanolid (2). The isolation and elucidation of structure of these two characteristic sesquiterpenoids are described and the chemical relations shown. 1 is located in the young glandular hairs of the leaves and disappears with the increasing age of the leaf (figure 6).
    Notes: Bei der Gundelrebe kommen zwei Chemische Rassen vor: Für das chromogene Verhalten der einen Rasse ist der als Glechomafuran (1) bezeichnete Inhaltsstoff verantwortlich. Die auf EP-Reagenz nicht ansprechende Rasse enthält das sogenannte Glechomanolid (2). Die Isolierung sowie die Strukturaufklärung dieser beiden charakteristischen Sesquiterpenoide werden beschrieben und die chemischen Zusammenhänge aufgezeigt. 1 ist in den jungen Drüsenschuppen der Blätter lokalisiert und verschwindet darin mit zunehmendem Blattalter (Abb. 6).
    Additional Material: 6 Ill.
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