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  • Physics  (2)
  • Analytical Chemistry and Spectroscopy  (1)
  • emulsion polymerization  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Emulsion copolymerization of styrene with monomeric emulsifiers (1995)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 6 (1995), S. 452-454 
    Details
    ISSN: 1042-7147
    Keywords: emulsion polymerization ; AIBN ; monomeric emulsifiers ; latex characterization ; 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
    Notes: Monomeric emulsifiers with different copolymerization reactivities were used as stabilizers in emulsion polymerization of styrene initiated by 2,2′ azobisisobutyronitrile (AIBN). A significant change in emulsifier function was observed between equal micellar concentrations of surface-active sodium sulfopropyl alkyl maleates and the corresponding sodium sulfopropyl dodecyl fumarate. In the presence of less reactive maleates, copolymerization mainly occurs in the interface of the monomer swollen particles, while copolymerization with the fumarate in the first period of emulsion polymerization leads to polyelectrolyte formation in the water phase.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1995.220060705
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  • 2
    Electronic Resource
    Electronic Resource
    Properties of cellulose acetate in solution. II. Light scattering and elasticity measurements on gels in benzyl alcohol (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 555-577 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Kinetic studies are reported for the light scattering and elasticity of thermally reversible gels of cellulose acetate in benzyl alcohol over a range of temperature and polymer concentration. The small-angle light scattering data are found to be described by exponential correlation functions, and it is concluded that the scattering has its origin in the nonrandom character of the crosslinking in the gels studied. The elasticity is discussed in terms of the density of crosslinks in the gels. Thus, the kinetics studied by light scattering and elasticity measurements are independently related to temperature and polymer concentration.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.180150312
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanismus der Amin-eliminierungen bei der Elektronenstoßinduzierten Fragmentierung von 1.3-Diaminopropanen (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 9 (1974), S. 1073-1080 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,3-Diaminopropanes exhibit strong elimination of amines from the molecular ions upon electron-impact. This is followed by secondary reactions in the course of which a substituent from the C-2 of the propane unit is eliminated and also a N-substituent to a smaller degree. Lowering the electron density at only one nitrogen atom by appropriate substituents causes a decrease in the intensity of both [M-amine]+· ions. The corresponding fragmentation processes were investigated by means of deuterium labelling.
    Notes: 1,3-Diaminopropane spalten beim Elektronestoßinduzierten Zerfall in starkem Maße aus den Molekülionen Amine ab. Dem schließen sich Folgereaktionen an, in deren Verlauf Vorzugsweise ein Substituent vom C-2 der Propankette, in geringerem Maße jedoch auch ein N-Substituent eliminiert werden. Erniedrigung der Elektronendichte an nur einem Stickstoffaton durch geeignete Substituenten führt Zu einem Intensitätsabfall beider [M-Amin]+· Ionen. Die zugrun-deliegenden Fragmentierungsprozesse wurden mit Hilfe deuterierter Verbindungen untersucht.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210091103
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  • 4
    Electronic Resource
    Electronic Resource
    Properties of cellulose acetate. III. Light scattering from concentrated solutions and films. Tensile creep and desalination studies on films (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 17 (1979), S. 917-937 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Light scattering from concentrated solutions of cellulose acetate in acetone is discussed in terms of exponential correlation functions for refractive-index fluctuations. These are related to intermolecular aggregation. Light scattering, tensile creep and recovery, and hyperfiltration studies with films of cellulose acetate cast from acetone are discussed in terms of the state of aggregation in the films. It is concluded that intermolecular aggregates are probably small and imperfectly formed regions of microcrystallinity stable up to about 210°C, with the overall state one of near amorphous disorder.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.180170602
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