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  • Chemistry  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Morphology and supermolecular structure of the polymer system PA-6/PMA (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 168 (1989), S. 9-21 
    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: Die Ergebnisse von Untersuchungen über die molekulare Überstruktur von Mischungen aus teilkristallinem Polyamid-6 (PA-6) und amorpher Poly(methacrylsäure) (PMA) werden vorgestellt.Die Bestimmung der molekularen Überstruktur gelang durch Berechnung von Korrelationsfunktionen und Grenzflächenverteilungsfunktionen aus SAXS-Aufnahmen.Der Einbau von Poly(methacrylsäure) bewirkt eine Transformation der Kristallstruktur des PA-6 vom γ-Typ zum α-Typ. Bei einem PMA-Gehalt von weniger als 46% hat die Mischung eine lamellare Struktur; ein zunehmender PMA-Anteil vergrößert die Langperiode. PMA bildet mit dem amorphen Anteil von PA-6 eine homogene Phase; Mikrodomänen werden nicht beobachtet.Mit zunehmendem PMA-Gehalt sinkt der Kristallinitätsindex. Gleichzeitig nimmt die Dicke der Übergangsschicht zwischen den kristallinen Regionen und der aus PMA und amorphem PA-6 bestehenden Phase zu. Bei hohem PMA-Gehalt verschwindet die lamellare Struktur.
    Notes: The results of investigations of the supermolecular structure of the mixture of a semicrystalline polymer polyamide-6 (PA-6) and of an amorphous one, poly(methacrylic acid) (PMA), are presented. The determination of the supermolecular structure was realized using the correlation functions and the interface distribution functions calculated from SAXS patterns. It was stated that the introduction of poly(methacrylic acid) results in a transformation of the γ-type crystalline structure into the α-type structure. Until the PMA content is less than 46%, the blend has a lamellar structure, and an increase in the PMA content causes an increase in the long period. PMA and the amorphous phase of PA-6 form a homogeneous phase, there are no microdomains of PMA.An increase in the PMA content results in a decrease of the crystallinity index. Simultaneously, the thickness of the transition layers between the crystalline regions and the phase composed of PMA and of the amorphous phase of PA-6 increases. When the content of PMA is large, the lamellar structure disappears.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051680102
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The supermolecular structure of poly(vinyl chloride)-poly(methyl methacrylate) blends (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 1469-1478 
    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: Investigations of the supermolecular structure of PVC/PMMA blends, covering a wide range of composition, are presented. It was found that a transition layer exists between PVC and PMMA phases. The thickness of the transition layer is independent of blend composition. The scattering intensity distribution function for blends is characteristic of isotropic, amorphous systems with a completely random distribution of phases. It was shown that scattering intensity distribution function may be used for calculation of a distribution, which corresponds a two-phase system with sharp phase boundaries. Values of correlation lengths, inhomogeneity lengths, and specific surfaces were then calculated. A model of the supermolecular structure of PVC/PMMA blend was finally proposed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070380805
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of the theoretical methods of calculations of ideal fiber birefringences (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 1653-1658 
    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: Based on the equation carried out previously, theoretical birefringence has been calculated for selected synthetic fibers, taking into account intermolecular interactions. The calculation has been carried out using bond polarizabilities given by Denbigh [Trans. Faraday Soc., 36, 936 (1940)] and Pietralla [J. Polym. Sci., Polym. Phys. Ed., 18, 1117 (1984); 20, 1193 (1982)]. Large discrepancies of Δnid for polyamides between theoretical and experimental values have been found. The necessity for elaborating a new method of birefringence calculations has been pointed out.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070300430
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of the birefringence of an ideal polyester fiber (PET) with regard to the intermolecular interactions (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 1335-1346 
    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: Method of birefringence determination for an ideal polyester fiber has been described with regard to the interactions of surrounding macromolecules, Δn = 0.2360. Obtained results have been discussed in view of information given in the literature.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280408
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    Paper (German National Licenses)
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