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  • 1
    Electronic Resource
    Electronic Resource
    Interfacial segment density profiles of end-anchored polymers in a melt (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 2359-2368 
    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/ma00035a012
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ordering in asymmetric poly (ethylene–propylene)–poly (ethylethylene) diblock copolymer thin films (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 1620-1629 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have used neutron reflection and phase contrast microscopy to investigate the morphology and surface topology of thin films of nearly symmetric (f=0.55) and asymmetric (f=0.77), poly (ethylene–propylene)–poly (ethylethylene) (PEP–PEE) diblock copolymers (f being the PEP volume fraction) and have identified three important differences in their ordering properties. First, annealed films of the asymmetric diblocks do not form the lamellar microstructure found in symmetric diblocks; their structure can instead be modeled in terms of the hexagonal packing of PEE cylinders observed in bulk small-angle neutron scattering measurements. However, the cylinders show in-plane distortions, which we interpret in the context of nonintegral layering. These distortions are amplified at the surfaces where the PEE assumes lamellarlike form. Second, as-cast films of the asymmetric diblock are characterized by a microstructure lacking long-range order, pinned between strongly segregated PEE at both surfaces. These films can be equilibrated through annealing, leading to the well-ordered structures described earlier. The changes with annealing are surprising given that both PEP and PEE are well above their glass transitions at room temperature. Finally, the block asymmetry and the associated cylindrical structure in the interior are also manifested in the surface topology. Thin films of asymmetric PEP–PEE are smooth on a macroscopic scale unlike their symmetric counterparts, which form islands on the surface to accommodate films of nonintegral lamellar thicknesses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466589
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Formation and dissolution of phase-separated structures in ultrathin blend films (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 191-200 
    Details
    ISSN: 0887-6266
    Keywords: ultrathin films ; polymer blends ; phase separation ; atomic force microscopy ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The phase separation of ultrathin polymer blend films of deuterated poly(styrene)/poly(vinylmethylether) leads to a variety of film morphologies, depending on polymer composition. Phase-separation measurements are made at a constant temperature difference from the critical temperature, leading to a bicontinuous spinodal decomposition pattern for near-critical blend compositions and to “mounds” and “holes” for PVME-rich and dPS-rich off-critical mixtures, respectively. Reverse temperature jumps of the phase-separated blend films into the one-phase region result in dissolution of the undulating surface patterns, confirming the phase-separation origin of the film patterns. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 191-200, 1998
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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