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  • Articles: DFG German National Licenses  (3)
  • 1995-1999  (3)
  • Polymer and Materials Science  (2)
  • Key words Transcrystallinity  (1)
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  • Articles: DFG German National Licenses  (3)
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Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    AFM imaging of interfacial morphologies in carbon-fiber reinforced isotactic polypropylene (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 181-186 
    Details
    ISSN: 1435-1536
    Keywords: Key words Transcrystallinity ; isotactic polypropylene ; carbon-fiber ; morphology ; atomic force microscopy ; nucleation
    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 morphology of high-modulus carbon-fiber (HM-CF) reinforced isotactic polypropylene (iPP) was investigated for the first time by atomic force microscopy (AFM) using chemically etched specimens. The images exhibited α-transcrystalline morphology for samples crystallized from quiescent melts, nucleated by HM-CF. In melts sheared by fiber pulling, αβ-cylindritic columnar morphology was observed in agreement with earlier thermo-optical studies. AFM images in the interfacial region of the β-cylindrites unveiled fine morphological details of α-row nuclei. Based on the observations, we concluded that in β-cylindrites, the lamellar growth in α-row nuclei occurs during epitaxial crystallization on bundles of extended iPP chains which form during shearing of the polymer matrix by fiber pull.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050069
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Thixotropic behavior of metal-containing coordination polymers: Melt viscosity of neutral aliphatic polyesters with Zn carboxylates (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 277-282 
    Details
    ISSN: 0887-6266
    Keywords: coordination polymers ; melt viscosity ; thixotropy ; polyesters ; telechelic networks ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The viscosity behavior of polymer melts containing complexes formed between the neutralized polyester poly(diethylene glycol-co-succinic acid) and Zn acetates is discussed. The melt viscosity of these materials increases with the concentration of metal ions, and shows strong thixotropy and shear thinning. This behavior is attributed to the formation of coordination bonds between the electron donor groups within the polyester chain, and empty coordination sites of the various Zn acetate salts. The coordination complexes were obtained in situ in the polymer melt, which contains well-dispersed ZnO, by adding an equimolar amount of CH3COOH. It is proposed that the shear applied to the polymer melt destroys the polar network of the coordination polymer at a rate that is greater than the rate of reformation of the coordination bonds for the sample returning back to equilibrium, following a shear deformation. © 1996 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Observations of crystallization and melting in poly(ethylene oxide)/poly(methyl methacrylate) blends by hot-stage atomic-force microscopy (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 2643-2651 
    Details
    ISSN: 0887-6266
    Keywords: poly(ethylene oxide) ; poly(methyl methacrylate) ; blends ; atomic-force microscopy ; crystallization ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The binary blend of poly(ethylene oxide)/atactic poly(methyl methacrylate) is examined using hot-stage atomic-force microscopy (AFM) in conjunction with differential scanning calorimetry and optical microscopy. It was found possible to follow in real time the melting process, which reveals itself to be nonuniform. This effect is ascribed to the presence of lamellae having different thicknesses. The crystallization process of poly(ethylene oxide) from the miscible melt is also followed in real time by AFM, affording detailed images of the impingement of adjacent spherulites and direct observation of lamellar growth and subsequent polymer solidification in the interlamellar space.© 1998 John Wiley & Sons, Inc. J. Polym. Sci. B Polym. Phys. 36: 2643-2651, 1998
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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