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  • 11
    Electronic Resource
    Electronic Resource
    Syntheses of mono(1,3-oxazolin-2-yl)-terminated oligopropene macromonomers and novel polymers containing oligopropene side chains (1996)
    Springer
    Polymer bulletin 36 (1996), S. 303-309 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Mono(1,3-oxazolin-2-yl)-terminated atactic oligopropene with Mn=710g/mol was derived in high yields from monoester-terminated oligopropene via reaction with 2-aminoethanol and subsequent Ti(OC4H9)4-catalyzed dehydration at 180°C. Cationic bulk polymerization of this novel macromonomer, initiated with 2 mol% methyl-4-nitrobenzenesulfonate at 200°C, afforded high molecular weight poly[N-oligopropene-1-carbonyl]-ethyleneimine]. Grafting of mono(1,3-oxazolin-2-yl)-terminated oligopropene with poly(ethene-co-methacrylic acid), containing 3 mol% methacrylic acid, by heating both components for 15minutes at 220°C yielded novel ethene copolymers containing 41wt% esteramide-coupled oligopropene as side chains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319229
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  • 12
    Electronic Resource
    Electronic Resource
    Living dispersion polymerization of styrene in the presence of polystyrene-block-poly(4-trimethylsilylstyrene) (1994)
    Springer
    Polymer bulletin 32 (1994), S. 545-550 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Living polystyrene microparticles with average particle diameters varying between 0.5 and 3.8 μm were obtained via sec-butyl lithium-initated anionic polymerization of styrene in n-hexane diluent when polystyrene-block-poly(4-trimethyl-silylstyrene) was added as dispersing agent. The influence of block copolymer molecular architecture and concentration as well as polymerization temperature, monomer concentration and THF addition on polystyrene particle size, molecular weight and molecular weight distribution were investigated. In comparison to anionic styrene polymerization in cyclohexane solution, the anionic styrene dispersion polymerization in n-hexane was markedly slower.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00973900
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  • 13
    Electronic Resource
    Electronic Resource
    Emulsion polymerization of styrene in the presence of carbohydrate-based amphiphiles (1995)
    Springer
    Polymer bulletin 34 (1995), S. 271-277 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Novel amphiphilic N-alkyl-, N-decenyl-, and N-alkyl-N'-methyl-semicarbazones of maltose and maltotriose with CnH2n+1 alkyl chains and n=8,9,10,11,12,16 were applied as emulsifiers in styrene emulsion polymerization. Surfactant properties, emulsion polymerization, and rheology were examined as a function of amphiphile molecular architectures. Both critical micelle concentration and average polystyrene particle size increased with decreasing alkyl chain length. Using N-methyl-N-[11-(acryloylamino)-undecanoyl]-glucamine comonomer in a starved feed emulsion polymerization process, it was possible to prepare uniform polystyrene latex with glucamide surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294144
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  • 14
    Electronic Resource
    Electronic Resource
    Syntheses and properties of soluble poly(arylene thioether imide)s and the corresponding poly(arylene sulfone imide)s (1993)
    Springer
    Polymer bulletin 31 (1993), S. 137-143 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A series of soluble 6F polyimides were prepared from monodisperse diamineterminated oligo(phenylene thioether)s varying the number of phenylene thioether units between one and six. In a formic acid/hydrogen peroxide slurry the 6F poly(arylene thioether imide)s were converted into the corresponding poly(arylene sulfone imide)s containing controlled oligo(phenylene sulfone) segments. The oxidation process and the influence of oligo(phenylene thioether) and oligo(phenylene sulfone) segments on polymer phase transitions and thermal degradation were investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329958
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  • 15
    Electronic Resource
    Electronic Resource
    Anisotropic polyaramide/polyol dispersions—new components for the preparation of polyurethane microcomposites (1993)
    Springer
    Polymer bulletin 31 (1993), S. 421-428 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polymerization of N-(p-aminobenzoyl)-caprolactam (PAC) in melts of polyols such as dihydroxy-terminated oligo(oxytetramethylene) with Mn=2000 g/mol at 200°C afforded stable dispersions of poly(p-phenylenebenzamide) whiskers in polyol. In spite of the low molecular weight of the polyaramide, which was isolated by solvent extraction, the microparticles are efficient reinforcing agents of polyurethanes because of the excellent interfacial adhesion resulting from covalent attachment of the polyols onto the microparticle surfaces. The role of the competing formation of p-aminobenzoate-terminated polyols via esterification of PAC was investigated. Morphological and mechanical properties of polyurethane microcomposites, prepared from poly(p-phenylenebenzamide)/poly(oxytetramethylene)diol dispersions and 4,4′-diisocyanatodiphenylmethane, were determined as a function of the microparticle content. When compared to conventional polyurethanes, containing equivalent amounts of spherical organic and inorganic fillers, the microcomposites give higher Young's modulus, tensile strength without sacrificing high elongation at break.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329878
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  • 16
    Electronic Resource
    Electronic Resource
    Preparation and cure behavior of dimethacrylates containing oligo(tetrafluoroethene) segments (1994)
    Springer
    Polymer bulletin 32 (1994), S. 403-410 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Two novel families of dimethacrylate-based thermoset resins containing oligo(tetrafluoroethene) segments with n=1, 2, 3 tetrafluoroethene units were prepared from dimethyl tetrafluorosuccinate, dimethyl octafluoroadipate and dimethyl dodecafluorosuberate. Methacrylate functionalities were determined using1H-NMR spectroscopy. Photocrosslinking by UV irradiation in the presence of photoinitiators affords amorphous networks. The influence of the oligo(tetrafluoroethene) segment length on glass transition temperatures, swelling, volume shrinkage and thermal degradation was investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00587881
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  • 17
    Electronic Resource
    Electronic Resource
    The role of core/shell-microparticle dispersions in polypropylene/polyamide-6 blends (1994)
    Springer
    Polymer bulletin 32 (1994), S. 697-704 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Reactive blending of 70 vol.-% polypropylene (PP) and 30 vol.-% polyamide-6 (PA-6) was performed in the presence of various amounts of succinic-anhydride-functional elastomers which are immiscible with both blend components. Characteristic morphological feature of the resulting multiphase polymer blends was a continuous polypropylene matrix containing dispersed core/shell microparticles with rigid polyamide-6 core and soft elastomer shell. Accumulation of the elastomer component at the polypropylene/polyamide-6 interface and reaction of the succinic anhydride of the elastomer with the amine-endgroups of PA-6 enhanced PA-6 dispersion and proved to be the key to unusual property synergisms. In contrast to the conventional soft maleicanhydride-grafted EPM elastomer (EPM-g-MAH), the stiffer maleic-anhydride-grafted poly[styrene-b-(ethene-co-butene-1)-b-styrene] (SEBS-g-MAH) was much more efficient as blend compatibilizer and gave PP/PA-6 blends with greatly improved strength and toughness without sacrificing stiffness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00973922
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