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  • 1
    Electronic Resource
    Electronic Resource
    Sorption/desorption of ions by dynamic electrokinetic and permeability analysis of fiber plugs (1993)
    s.l. : American Chemical Society
    Langmuir 9 (1993), S. 3085-3092 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00035a056
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of polymer chain interpenetration in solution by fluorescence after freeze-drying (1982)
    s.l. : American Chemical Society
    Macromolecules 15 (1982), S. 828-831 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00231a026
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  • 3
    Electronic Resource
    Electronic Resource
    Optical properties of hair: detailed examination of specular reflection patterns in various hair types (2004)
    Oxford, UK : Blackwell Science Ltd
    International journal of cosmetic science 26 (2004), S. 0 
    Details
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Details of the specular reflection of curved hair tresses, resulting from illumination with a collimated incident light source, were examined both qualitatively and quantitatively using high-resolution photography and image analysis. The reflections were found to consist of a multitude of light dots aligned with the fibers and typically separated by a distance of 81–145 μm. The contrast between the dots (specular reflection) and the darker regions (diffuse reflection) of the entire reflection band was found to increase with increasing pigmentation of hair. Highly pigmented Oriental hair provided more contrast within the specular reflection band than unpigmented natural white hair. A quantitative description of the light reflection patterns within the specular reflection band included two-dimensional distribution of luminosity, histograms of the frequency of appearance for peak maxima and minima in luminosity distribution plots, and histograms of absolute maxima and minima of luminosity along the length of the fibers. Specular reflection from African hair, which consists of many curls that provide multiple and randomly distributed reflection centers, have also been investigated. Using microscopy software, image tool2.0, and a method termed image threshold, the number of reflection sites and their shapes could be quantified. For example, treatment of African hair with synthetic sebum was shown to significantly affect the reflection patterns, resulting in a decrease in the overall hair luster. Comparison of reflection patterns from Caucasian frizzy, very curly, and curly hair is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0142-5463.2004.00223_3.x
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of the amphiprotic nature of human hair keratin on the adsorption of high charge density cationic polyelectrolytes (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 847-858 
    Details
    ISSN: 1435-1536
    Keywords: Keratin fibers ; adsorption ; cationic polyelectrolytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Adsorption of the cationic polymers poly(methacrylamidopropyltrimethyl ammonium chloride) (PMAPTAC) and poly(1,1-dimethylpiperidinium-3,5-diallylmethylene chloride) (PDMPDAMC) on human hair was studied by measurements of the amount of polymer adsorbed and by the streaming potential method. Results reflect the amphoteric nature of the keratin surface and show that the excess of anionic sites at pH values above 4 is the main driving force for the adsorption of cationic polyelectrolytes. Lowering the pH below 4 or addition of neutral salt (KCl) reduces the amount of adsorbed polymer. It was shown that the adsorption of cationic polymer in the concentration range 0.01 to 0.1 % and at neutral pH reverses the overall character of the surface from anionic to cationic. Keratin fibers modified in this manner do not exhibit amphoteric character and bear excess positive charge in the pH range 2–9.5. The value of the amount of the polymer adsorbed at saturation concentration (∼2 mg/g) as well as the lack of molecular weight effect in the range (5 · 104 − 106) on the amount of polymer adsorbed suggest that polymer chains adopt a rather extended conformation on the fiber surface. Some data concerning the formation of a complex between adsorbed cationic polymer and anionic detergents or polyelectrolytes are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412964
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal degradation of poly(2,6-dimethyl-1,4-phenylene oxide). I. The mechanism of degradation (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 2891-2899 
    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: An analysis of products obtained from thermal degradation of poly(2,6-dimethyl-1,4-phenylene oxide) is presented. The techniques used for identification of monomeric and dimeric degradation products were gas chromatography and mass spectrometry. On the basis of this analysis a mechanism of thermal breakdown is established. It consists of the Fries-type rearrangement of the polymer chain in the first degradation step and statistical scission of benzyl bonds. The proposed degradation scheme accounts for the retention of ether linkage in the afterdegradation residue.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1978.070221015
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  • 6
    Electronic Resource
    Electronic Resource
    Dilatometric examination of phase transitions in blends and graft copolymers of poly(2,6-dimethyl-1,4-phenylene oxide) and polystyrene (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 156-159 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Mischungen aus Polystyren (PS) und Poly(2,6-dimethyl-1,4-phenylen-oxid) (PPO) sowie Pfropfcopolymere von PS auf PPO wurden hergestellt. Bei den Mischungen ergaben die dilatometrischen Messungen nur eine Glasübergangstemperatur Tg, woraus auf vollständige Mischbarkeit zu schließen ist. Dagegen bilden die Copolymere heterogene Systeme. Als Ursache für die Homogenität der Mischungen und die Inhomogenität der Copolymere werden Einflüsse des freien Volumens angesehen. Die mit Hilfe der von Kanig angegebenen Gleichung berechnete Wechselwirkungsenergie begünstigt die Mischung
    Notes: The blends polystyrene/poly(2,6-dimethyl-1,4-phenylene oxide) (PS/PPO) and copolymers of PS grafted on PPO were prepared. The blends were found to be completely miscible as judged by single Tg temperatures on the basis of dilatometirc measurements, while the copolymers were found to form heterogeneous systems. The reason for homogeneity of the blends and inhomogeneity of copolymers is explained in terms of free volume effects. The interaction energy, evaluated by means of Kanig's equation, was found to be favourable for mixing.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320306
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  • 7
    Electronic Resource
    Electronic Resource
    Some aspects of the photooxidation mechanism of poly(2,6-dimethyl-1,4-phenylene oxide) (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 637-642 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Photooxidation von Poly(2,6-dimethyl-1,4-phenylenoxid) wurde mit verschiedenen Methoden wie UV-, IR- und Massenspektroskopie sowie durch die Bestimmung der Viskosität und Sauerstoffaufnahme untersucht. Es wurde gefunden, daß die Photooxidation durch die Sauerstoffdiffusion kontrolliert wird und daß die Geschwindigkeitskonstanten der Sauerstoffaufnahme ähnliche Werte haben, wie für andere amorphe Polymere gefunden wurden. Die spektroskopischen Untersuchungen haben gezeigt, daß die UV-Bestrahlung in Anwesenheit von Sauerstoff zu einer statistischen Kettenspaltung und zur Erzeugung von Aldehyden führt.
    Notes: The photooxidation of poly(2,6-dimethyl-1,4-phenylene oxide) was studied by using various analytical techniques such as UV, IR, MS spectroscopy as well as viscosity and oxygen uptake measurements. The photooxidation process was found to be diffusion controlled and the rate coefficients of oxygen uptake have similar values as other amorphous polymers. Spectroscopic techniques showed that UV irradiation in the presence of oxygen leads to statistical scission of the polymer and formation of aldehydes.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010321011
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