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  • Springer  (9)
  • 1990-1994  (9)
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Verlag/Herausgeber
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Syntheses and thermal properties of aromatic and semi-aromatic polythioetheramides containing oligo(thio-1,4-phenylene) segments (1993)
    Springer
    Polymer bulletin 31 (1993), S. 129-136 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary A family of aromatic and semi-aromatic polythioetheramides was prepared from well-defined diamine-terminated oligo(thio-1,4-phenylene)s (PPS-DA) containing n=1,2,3,4,5,6 thio-1,4-phenylene units. Polycondensation reactions with adipic, sebacic, terephthalic and isophthalic acid chlorides were carried out in N-methyl-2-pyrrolidone solution at room temperature to yield amorphous and semi-crystalline polythioetheramides. The influence of the oligo(thio-1,4-phenylene) segment lengths on phase transitions and thermal degradation of the polythioetheramides was investigated. As a function of the PPS segment lengths, glass transition temperatures vary between 120°C and 300°C, and melting temperatures between 290°C and 500°C. The thermal stabilities determined by thermogravimetric analysis under nitrogen increase with increasing PPS segment lengths. In the case of the higher molecular weight PPS segments, the resulting semi-aromatic polyamides exhibit two crystalline phase transitions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00329957
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  • 2
    Digitale Medien
    Digitale Medien
    Use of poly(styrene)-block-poly(ethyleneoxide) as emulsifier in emulsion polymerization (1994)
    Springer
    Polymer bulletin 33 (1994), S. 521-528 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Poly(styrene)-block-poly(ethyleneoxide), abbreviated as (PS-b-PEO) were used as emulsifiers in emulsion polymerization of styrene and methyl methacrylate. The block copolymers had a poly(styrene) block with Mn=1000 g/mol and a poly(ethyleneoxide) block with Mn=1000, 3000 or 5000 g/mol, respectively. Stable dispersions were obtained when the PEO block molecular weight was higher than 1000 g/mol. Also the amphiphilic properties of the copolymers depended on the PEO chain length. Block copolymer micelles with hydrodynamic radii between 11 and 17nm were observed. Emulsion polymerization was performed at different block copolymer concentration at 60 and 80°C. Particle size varied between 50 and 300nm and decreased with increasing copolymer concentration. The particle size was larger at higher temperature, but the size distribution was narrower. Polymerization of methyl methacrylate gave smaller particles when compared to styrene. The dispersions were very stable towards high electrolyte concentration, but flocculation occurred at elevated temperatures. Both observations indicate that the dispersions are sterically stabilized.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00296159
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00329958
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  • 4
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00329878
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  • 5
    Digitale Medien
    Digitale Medien
    Preparation and cure behavior of dimethacrylates containing oligo(tetrafluoroethene) segments (1994)
    Springer
    Polymer bulletin 32 (1994), S. 403-410 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00587881
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  • 6
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00973922
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  • 7
    Digitale Medien
    Digitale Medien
    Mechanical properties of organosolv-lignin-filled thermoplastics (1994)
    Springer
    Polymer bulletin 32 (1994), S. 361-365 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Organosolv lignin was used as organic filler for polypropylene (PP) and poly(ethene-co-vinylacetate) (EVA) containing 13wt-% vinylacetate. As a function of the lignin content, which was varied between 0 and 30wt-%, mechanical properties such as Young's modulus, yield stress, fracture stress, and elongation at break of the thermoplastic lignin-based compounds were measured. Both lignin-filled thermoplastics exhibit pronounced matrix reinforcement with increasing lignin content. Due to better interfacial adhesion between lignin and EVA, 30wt-% lignin addition to EVA doubles Young's modulus without sacrificing high elongation at break.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00308549
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  • 8
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00973900
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  • 9
    Digitale Medien
    Digitale Medien
    Polymers from renewable resoureces: polyester resins and blends based upon anhydride-cured epoxidized soybean oil (1993)
    Springer
    Polymer bulletin 31 (1993), S. 679-685 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary A broad range of crosslinked polyesters were prepared by curing epoxidized soybean oil with various dicarboxylic acid anhydrides in the presence of cure catalysts such as tertiary amines, imidazoles, or aluminum acetylacetonate. The mechanical and thermal properties of the casting resins were dependent upon the type of anhydride. While the anhydrides of hexahydrophthalic acid, succinic acid, and norbornene dicarboxylic acid yielded highly flexible rubbery materials with glass transition temperatures below room temperature, the more rigid anhydrides of maleic and phthalic acid gave amorphous stiff polyesters with higher glass transition temperatures varying between 43 and 73°C. When the cure reaction was carried out in polypropylene melts, multiphase polymers were formed containing polyester phases dispersed in the continuous polyolefin matrix.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00300127
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