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  • 1985-1989  (5)
  • Chemistry  (3)
  • X-ray analysis  (2)
  • Key words Ectatic leg veins
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 266 (1988), S. 227-234 
    ISSN: 1435-1536
    Keywords: Polyoctenamer ; microstructure ; X-ray analysis ; electron microscopy ; interface distribution function
    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 The microstructure of trans-polyoctenamer has been investigated as a function of the trans double bond concentration and the type of regulator. The samples were characterized using GPC, DSC and X-ray wide and small angle scattering. The small angle scattering was analyzed by calculating interface distribution functions and by Guinier and Porod analysis. It was found that the microstructure is primarily determined by the trans content. The type of regulator has a minor influence.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 266 (1988), S. 411-418 
    ISSN: 1435-1536
    Keywords: Core-fibrils ; crystallization models ; fiber morphology ; X-ray analysis
    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 Crystallization models for the formation of core-fibrils crystallized from the oriented melt are discussed by comparing results from X-ray experiments with theoretical predictions. Two sets of polymer blends, the systems iPP/PB-1 and iPP/aPP have been measured. From wide angle X-ray scattering, the thicknesses of the core-fibrils, lattice distortions, and unit-cell parameters have been determined. Interface distribution functions have been used to evaluate the axial morphology of the fibers from meridional small angle X-ray scattering curves. It appears that the morphological predictions made by the crystallization models of Pennings and of Hoffman cannot be confirmed by the experimental findings. The diffusion model proposed by Petermann partially describes the morphological properties of the core-fibrils.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 157 (1988), S. 165-176 
    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: Aus der Röntgenkleinwinkelstreuung von aus der orientierten Schmelze kristallisierten Legierungen aus isotaktischem Polypropylen und Poly(1-buten) wurden Grenzflächenverteilungsfunktionen berechnet. Die Proben enthalten Nadelkristalle, die in Bezug auf ihre Abstandsverteilung ein „verdünntes System“ darstellen. Es wird gezeigt, daß die Berechnung von Grenzflächenverteilungsfunktionen aus jeweils nur zwei Grenzflächen möglich ist. Der Vergleich der erhaltenen Nadeldicken mit Ergebnissen aus anderen Auswertemethoden ergibt eine gute Übereinstimmung.
    Notes: Interface distribution functions have been evaluated from the equatorial small angle x-ray scattering of blends of isotactic polypropylene and poly(1-butene) crystallized in the shear field of the oriented melt. The samples contain core fibrils which represent a diluted system with respect to their distance statistics. It is shown, that interface distribution functions can be calculated from only two interfaces (diffuse phase boundaries between fibrils and amourphous phase). The calculated thicknesses agree well with values determined from other methods.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 163 (1988), S. 199-204 
    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: Mechanical parameters like Youngs modulus and yield stress have been measured from a set of samples of fiber reinforced polymer composites. The values have been correlated to the lateral diffuse phase boundary thicknesses of the fibers. It has been found, that the phase boundary is an important morphological feature responsible for the transfer of load from the matrix onto the fibers.
    Notes: An aus der orientierten Schmelze kristallisierten, eigenfaserverstärkten Polymerlegierungen aus isotaktischem Polypropylen (iPP) und isotaktischem Poly(1-buten) (PB-1) wurden mechanische Parameter (E-Modul, Fließspannung) gemessen und mit aus äquatorialen Röntgenkleinwinkelstreukurven bestimmten lateralen Grenzschichtdicken korreliert. Die Kurvenverläufe von E-Modul, Fließspannung und Grenzschichtdicke als Funktion der Komponentenzusammensetzung stimmen qualitativ überein. Es wird gezeigt, daß die Morphologie der Grenzschicht von besonderer Bedeutung für die Übertragung der Spannungen von der Matrix auf die Fasern ist.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 130 (1985), S. 155-170 
    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: Aus der Röntgenkleinwinkelstreuung an Legierungen von isotaktischem Polystyrol (iPS) und Poly(2,6-dimethylphenylenoxid) (PPO) wurden Strukturparameter durch Berechnung von Grenzflächenverteilungsfunktionen bestimmt. Es konnte gezeigt werden, daß eine Reihe von Parametern wie die mittlere Dicke von Lamellen und interlamellaren Abständen sowie die Langperiode trotz z. T. großer Unsicherheiten bei der Korrektur der experimentellen Streukurve mit großer Genauigkeit bestimmt werden können. Die aus Grenzflächenverteilungsfunktionen bestimmten Werte wurden mit Ergebnissen aus Modellstreukurvenberechnungen verglichen. Dabei stellte sich heraus, daß theoretische Berechnungen mit einem Modell, das zusätzlich zur kristallinen und amorphen Dichte die mittlere Dichte der Probe berücksichtigt, im wesentlichen dieselben Parameter liefern wie die aus den Grenzflächenverteilungsfunktionen bestimmten.
    Notes: Morphological parameters of isotactic polystyrene (iPS) · poly(2,6-dimethylphenylene oxide) (PPO) blends have been determined from measurements of the small angle X-ray scattering by calculating interface distribution functions. Applied to the compatible system iPS/PPO this method yields a number of reliable parameters such as the long period and mean thicknesses of crystal lamellae and interlamellar spacings. A comparison of the results obtained from the calculation of the interface distribution functions with those derived from model calculations show that theoretical calculations using the density model yield essentially the same results.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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