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  • 1
    Electronic Resource
    Electronic Resource
    Morphological Studies of Semicrystalline Poly(2,6-dimethylphenylene oxide) (1976)
    s.l. : American Chemical Society
    Macromolecules 9 (1976), S. 253-257 
    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/ma60050a015
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  • 2
    Electronic Resource
    Electronic Resource
    Small-angle x-ray investigation of morphological order in the system: isotactic polystyrene-poly(2,6-dimethylphenylene oxide) (1986)
    s.l. : American Chemical Society
    Macromolecules 19 (1986), S. 1272-1274 
    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/ma00158a059
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  • 3
    Electronic Resource
    Electronic Resource
    Small angle X-ray studies on the core crystals in oriented polypropylene/polybutene-1 blends (1984)
    Springer
    Colloid & polymer science 262 (1984), S. 435-444 
    Details
    ISSN: 1435-1536
    Keywords: core-fibrils ; polypropylene/polybutene-1 blends ; small-angle x-ray scattering
    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 equatorial small-angle x-ray scattering of blends of polypropylene and polybutene-1 crystallized from the oriented melt, has been analyzed by means of Guinier- and Porod analysis and absolute intensity measurements. The thickness of the core crystals, which appear to have an ellipsoidal shape, is of the order of 160 Å and does not vary with sample composition. Measurements of the half widths of the (110)- and (220)-wide angle x-ray diffraction lines indicate a decrea.se of the lateral dimension of the core crystals for both components. Calculations of the scattering power through a three-phase model for the electron densities indicate a non-proportional distribution of crystalline and amorphous phases in the blends.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412037
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  • 4
    Electronic Resource
    Electronic Resource
    Crystallization kinetics of isotactic polypropylene blended with atactic polystyrene (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 528-535 
    Details
    ISSN: 1435-1536
    Keywords: Polypropylene/polystyreneblends ; nucleation ; isothermalcrystallization ; spheruliticgrowth
    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 kinetic parameters, such as spherulitic growth rates, nucleation densities, and Avrami-exponents, have been determined by optical microscopy for isotactic polypropylene blended with atactic polystyrene. It is found that the crystallization of iPP is strongly influenced by the presence of polystyrene. With increasing PS concentration in the blend, the nucleation densities decrease, while the spherulitic growth rates as well as the positions of thermal peaks, measured by DSC, remain independent of sample composition. Due to the formation of interfaces as a consequence of increasing dispersion of polystyrene the nucleation changes from preferentially thermal to athermal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410294
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  • 5
    Electronic Resource
    Electronic Resource
    Transfer of load from matrix to fiber in self-reinforced polymer composites (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 1212-1223 
    Details
    ISSN: 1435-1536
    Keywords: Self-reinforced polymer composites ; mechanical properties ; interface ; transfer of load
    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 tensile properties of self-reinforced polypropylene composites, obtained by rapid extension of an isotactic polypropylene/atactic polypropylene melt, have been measured and correlated to morphological parameters derived from x-ray experiments. The longitudinal morphology of the core-fibrils is found to be independent of sample composition, while the lateral thickness of the fibers varies between 220 Å for iPP and 110 Å for the blend containing 50 wt.% aPP. Critical fiber lengths, as a function of sample composition and the elastic modulus and the yield stress of the fibers, could be determined. While the number of corefibrils increases with mass fraction of atactic polypropylene, the length of the lateral interface between fiber and matrix and the interface volume decreases with increasing aPP mass fraction. It is shown that this interface is responsible for the mechanical behavior of the composite by effecting the transfer of load from matrix to fiber.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652530
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  • 6
    Electronic Resource
    Electronic Resource
    Die Bedeutung der mittleren Probendichte für die quantitative Interpretation der Röntgenkleinwinkelstreuung teilkristalliner Polymerer (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 125-132 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary Superstructural parameters of polymeric material composed of clusters of lamella-shaped crystals can be obtained by model-calculations of their small-angle x-ray scattering curves. In this paper it has been demonstrated, that in many cases the modulation of the scattering curve is determined not only by the inner structure of the cluster but also dependent on the average (electron) density of the cluster environment, the mean sample density. Discussing the SAXS of the systems HDPE, PP and iPS/PPO it has been shown, that the use of a simpler „,black-white” model, in which the crystalline density has been setϱ c = 1 and the amorphous densityϱ a = 0, leads to a „phony fit”. The incorporation of the mean sample density into the model yields a different set of parameters. The mean sample density can be neglected as soon as the number of lamellae per cluster exceeds the value of 10.
    Notes: Zusammenfassung Die Bestimmung von überstrukturdaten polymerer Lamellenclustersysteme kann über Modellrechnungen der Röntgenkleinwinkelstreukurven erfolgen. Es wird gezeigt, daß in vielen Fällen die Modulation der Streukurve nicht allein durch die innere Struktur der Cluster bestimmt ist, vielmehr muß die mittlere Elektronendichte der Umgebung der Cluster mitberücksichtigt werden. An den Systemen HDPE, PP und iPS/PPO wird gezeigt, daß die Verwendung eines einfacheren Modells, in dem die kristalline Dichte ϱc = 1 und die amorphe Dichte ϱa = 0 gesetzt wird („schwarzweiß”-Modell), für kleine Lamellenzahlen pro Cluster zu einer Scheinanpassung führt. Die BerÜcksichtigung der mittleren Probendichte fÜhrt zu abweichenden Anpassungsparametern bei der Berechnung der experimentellen Streukurve und damit zu anderen Über-rstrukturdaten. Der Einfluß der Umgebungsdichte wird vernachlässigbar klein, wenn die Zahl der lagekorrelierten Lamellen pro Cluster größer als 10 wird.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01679169
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  • 7
    Electronic Resource
    Electronic Resource
    Die Anwendungsgrenzen des eindimensionalen Clustermodells bei der Röntgenkleinwinkelanalyse teilkristalliner Polymerer (1979)
    Springer
    Colloid & polymer science 257 (1979), S. 606-621 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary The validity of the one-dimensional lamellas-cluster theory employed for the analysis of the small angle X-ray scattering of three dimensional structures in partially crystallized polymer systems has been investigated. The most significant approximation is the assumption, that the lateral dimensions of the lamellae (and of the clusters built up by them) are regarded to be infinit. It can be shown, that a one-dimensional analysis can be applied, when the ratio of the lateral extension, X, of the lamella, divided by their thickness, Z, is equal to or exceeds the value of 3. Since lamellae of such kind are found in most partially crystallized polymers, the application of the one-dimensional theory proves correct for the SAXS-analysis of these systems
    Notes: Zusammenfassung Es wird untersucht und diskutiert, unter welchen Voraussetzungen das eindimensionale Lamellen-Clustermodell auf dreidimensionale Strukturen angewendet werden kann. Die am weitesten gehende Näherung ist die Annahme, daß die kristallinen Lamellen und damit auch die Cluster lateral unendlich ausgedehnt sind. Es wird gezeigt, daß eine eindimensionale Analyse dann gerechtfertigt ist, wenn das Verhältnis der Lateralabmessung X zu Longitudinalabmessung Z den Wert 3 erreicht oder übersteigt. Da die meisten interessierenden Polymere diese Bedingung erfüllen, ist die Anwendung des eindimensionalen LamellenClustermodells für die Auswertung der Röntgenkleinwinkelstreukurven dieser Systeme gerechtfertigt
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01548830
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  • 8
    Electronic Resource
    Electronic Resource
    The microstructure of trans-polyoctenamer (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 227-234 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01452584
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  • 9
    Electronic Resource
    Electronic Resource
    Interactions between the components in isotactic polypropylene blended with EPDM (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 824-833 
    Details
    ISSN: 1435-1536
    Keywords: Polypropylene ; EPDM ; interphase
    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 interaction of isotactic polypropylene with ethylene propylene diene terpolymer in their blends has been investigated by use of differential scanning calorimetry, dynamic mechanical analysis, wide- and small-angle x-ray scattering, and by investigating the nucleation and kinetics of crystallization of the iPP component under the polarization microscope. It is found, that the dispersion of the EPDM component in the iPP matrix is dependent on blend composition and is maximal at 10% EPDM content. An interface layer between the two components is formed by migration of iPP molecules into the EPDM phase. A model for this interface is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652764
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  • 10
    Electronic Resource
    Electronic Resource
    Einfaches Glättungsverfahren zur Entschmierung der Röntgenkleinwinkelstreukurven von Hochpolymeren (1972)
    Springer
    Colloid & polymer science 250 (1972), S. 414-416 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary The application of the desmearing-method ofGuinier andFournet requires a smoothed curve. A smoothing-procedure is described which is easy to handle and which needs an extremely short processingtime.
    Notes: Zusammenfassung Die Anwendung des Entschmierverfahrens vonGuinier undFournet setzt eine geglättete Kurve voraus. Es wird eine Glättungsprozedur beschrieben, die den Vorteil leichter Handhabung und kurzer Rechenzeit bietet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01507507
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