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  • 1
    Electronic Resource
    Electronic Resource
    Chain-fragment diffusion in liquid and glassy polymer blends (1991)
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 3821-3827 
    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/ma00013a013
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  • 2
    Electronic Resource
    Electronic Resource
    Bilayer structures in side chain LC copolymers (1993)
    s.l. : American Chemical Society
    Macromolecules 26 (1993), S. 2489-2495 
    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/ma00062a015
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  • 3
    Electronic Resource
    Electronic Resource
    Microphases and macrophases in polymer blends with a diblock copolymer (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 908-916 
    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/ma00082a005
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  • 4
    Electronic Resource
    Electronic Resource
    Solvent-induced phase separation in polycarbonate blends PC/TMPC (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 343-352 
    Details
    ISSN: 1435-1536
    Keywords: Polycarbonates ; polymerblends ; polymersolutions ; neutronscattering
    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 Compatibility of the polycarbonates of bisphenol A (PC) and tetramethyl bisphenol A (TMPC) was studied in glassy films cast from CH2Cl2 at room temperature, and above the glass-transition temperature. Blends with different compositions and of different molecular weights were analyzed by DSC and small-angle neutron scattering (SANS). Solution studies were made with light scattering and microscopy. Some of the blend films were two-phased when cast at room temperature, but all films were one-phased in equilibrium above the glass transition. The SANS data demonstrated that phase separation in the cast films was not caused by inherent incompatibility of PC and TMPC, but was induced by the solvent CH2Cl2. The effect is caused by a closed miscibility gap in the ternary solution system PC/TMPC/CH2Cl2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654581
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  • 5
    Electronic Resource
    Electronic Resource
    Phenylene motion in polycarbonate and polycarbonate/additive mixtures (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 815-822 
    Details
    ISSN: 1435-1536
    Keywords: Solid polymers ; molecular motion ; solid state NMR ; polycarbonate ; additives
    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 Pulsed deuteron NMR line shapes have been analysed to characterize type and time scale of the phenylene group motion in glassy bisphenol-A polycarbonate. The motional mechanism involvesπ-flips about theC 1 C 4 axis augmented by small angle fulctuations about the same axis, reaching a rms amplitude of ±35
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418458
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  • 6
    Electronic Resource
    Electronic Resource
    Interface stabilization and micelle formation in blends with a block copolymer (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 885-894 
    Details
    ISSN: 1435-1536
    Keywords: Polymerblends ; blockcopolymers ; compatibilizers ; phasemorphologies ; polymersolutions
    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 phase separation behavior of ternary blends of two homopolymers, PMMA and PS, and a block copolymer of styrene and methylmethacrylate, P(S-b-MMA), was studied. The homopolymers were of equal chain length and were kept at equal amounts. Two copolymers were used with blocks of equal length, which exceeded or equaled that of the homopolymer chains. Varied was the copolymer contentf. Films were cast from toluene, which is a nonselective solvent. The morphologies of the cast films were compared with the structure of the critical fluctuations in solution, which were calculated in mean field approximation. The axis of blend compositionsf can be divided into parts of dominating macrophase and microphase separation. Above a transition concentrationf o, all copolymer chains are found in phase interfaces. Belowf o, part of them form micelles within the homopolymer phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01469366
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  • 7
    Electronic Resource
    Electronic Resource
    Phase separation in blends of two homopolymers and a diblock copolymer during film casting (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 121-129 
    Details
    ISSN: 1435-1536
    Keywords: Polymer blends ; block copolymers ; phase morphologies
    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 Demixing during film casting of blends of polystyrene, polymethylmethacrylate, and a symmetric diblock copolymer of styrene and methylmethacrylate is discussed. The concentration fluctuations in the homogeneous solutions were calculated in mean field approximation. The structures in the homogeneous and demixed solutions and in the dry films were measured by small-angle x-ray scattering, and the morphologies of the dry films were characterized by transmission electron microscopy. The structure of the dry blends is evidently already pre-formed in solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658838
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  • 8
    Electronic Resource
    Electronic Resource
    Atomic force microscopy on tree-like crystals in polyvinylidene fluoride blends (1998)
    Springer
    Journal of materials science 33 (1998), S. 2305-2312 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polyvinylidene fluoride (PVDF), in homogeneous blends with an amorphous polymer under specific conditions, forms crystals with a tree-like architecture. Tree-like crystals have a loose fractal structure of crystalline branches which are impregnated with the amorphous polymer. In a previous study, this spectacular morphology was investigated in blends of PVDF and a random copolymer of styrene and methylmethacrylate (SMMA, 13% wt/wt styrene) by light microscopy. The crystal growth was interpreted in terms of a rate competition of crystallization and interdiffusion. The submicroscopic structure of tree-like PVDF spherulites has now been characterized by atomic force microscopy. Surface profiles were prepared by etching PVDF/SMMA blend films with toluene. The tree-like spherulites proved to be less disordered than expected. Their core consists of a compact array of lamellae, the planes of which are periodically twisted, producing a ring pattern. Near the crystallizing front, branches grow, separated from each other, into the amorphous phase. They are internally as compact as the core, but are covered by a loose fur of disordered lamellae. The tree-like appearance of these crystals comes from frequent splitting of the branches into twigs. Crystallographic bifurcation as in dendritic crystals was not observed. At interfaces between two tree-like crystals, the lamellae form patterns of backfolding. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004387304385
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  • 9
    Electronic Resource
    Electronic Resource
    Mutual miscibility of chlorinated hydrocarbon polymers derived from polyethylene and polyvinylchlorideDedicated to Prof. Dr. Dr. h. c. H. Hellmann on the occasion of his 75th birthday (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 171 (1989), S. 53-63 
    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: Untersucht wurde die Verträglichkeit von polymeren Chlorkohlenwasserstoffen mit verschiedener Comonomersequenzordnung. Eine erste Copolymerenserie (“PVCx”) wurde durch Reduktion von Polyvinylchorid hergestellt, eine zweite Serie (“PECx”) durch Chlorieren von Polyethylen. Die Polymer-Legierungen PECx/PECy, PVCx/PVCy und PVCx/PECy wurden bei 30°C und 110°C mit einer Lösungsfilmmethode analysiert. Im System PECx/PECy nimmt die Mischbarkeit mit steigendem Chlorgehalt der Copolymeren stetig zu. Bei den Systemen PVCx/PVCy und PVCx/PECy zeigt sich im Bereich um x = 1 eine erhöhte Tendenz zur Phasenseparation, die auf die bessere Comonomersequenzordnung der Copolymeren PVCx zurückzuführen ist. Im letzteren System ist diese Tendenz so stark, daß Polyvinylchlorid (PVCx=1) sogar mit dem chlorierten Polyethylen PECx=1, das die gleiche Bruttozusammensetzung hat, nicht mischbar ist.
    Notes: The compatibility of chlorinated hydrocarbon polymers of two different comonomer sequence orders was investigated. One series of copolymers (“PVCx”) was prepared via reduction of polyvinylchloride, the other (“PECx”) via chlorination of polyethylene in solution. The blends PECx/PECy, PVCx/PVCy and PVCx/PECy were analyzed with a film casting method at 30°C and 110°C. Miscibility increases in the system PECx/PECy steadily in the direction of increasing chlorine content. Due to the comonomer sequence order in the copolymers PVCx the systems PVCx/PVCy and PVCx/PECy show in the range around x = 1 an extra effect favouring phase separation. In the latter system this effect is so strong that polyvinylchloride (PVCx = 1) is even incompatible with the chlorinated polyethylene PECx=1 although both have the same overall composition.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051710104
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  • 10
    Electronic Resource
    Electronic Resource
    Tensile strength of thermoplastic blends and compositesDedicated to Prof. Dr. D. Braun on the occasion of his 60th birthday (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 185 (1991), S. 87-96 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Failure of purely thermoplastic blends has so far, in contrast to that of thermoplastic-elastomeric blends, not been studied extensively. In this investigation, the tensile strength of the brittle thermoplastics polymethylmethacrylate and polystyrene, of their random copolymers, their blends, and also of blends of polymethylmethacrylate with the copolymers was measured. The polymers behave all mechanically similarly, but the blends assume all degrees of miscibility and coarseness of phase morphology. For comparison with the blends, also macroscopic composites were tested.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1991.051850109
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