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  • Articles  (2,213)
  • Articles: DFG German National Licenses  (2,213)
  • Wiley-Blackwell  (2,213)
  • 1995-1999
  • 1985-1989  (2,213)
  • 1986  (2,213)
  • Physics  (2,213)
Collection
  • Articles  (2,213)
Source
  • Articles: DFG German National Licenses  (2,213)
Keywords
Publisher
Years
  • 1995-1999
  • 1985-1989  (2,213)
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Comparisons among some tetraalkoxysilanes in the hydrolytic precipitation of silica into elastomeric networks (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 2861-2866 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Four tetraalkoxysilanes Si(OR)4 were absorbed into networks of polydimethylsiloxane and then hydrolyzed, using a variety of catalysts, to give reinforcing silica particles. On the basis of the amount of silica precipitated and the extent of reinforcement, the (decreasing) order of effectiveness was found to be tetraethoxysilane, tetrapropoxysilane, tetrabutoxysilane, and tetramethoxysilane.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021871213
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  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamics of gas solubility in polymeric liquids (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 2867-2882 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A modified fluid-lattice model for mixtures of fluids is presented. Expressions for the basic thermodynamic quantities of mixing are given. From the equation for vapor-liquid equilibrium, the expression for the Henry constant at low pressure is derived. Weight fraction Henry constants for gas-polymer and gas-polymer-polymer systems are derived as limiting cases. Predictions of theory about the effect of temperature on the Henry constants are compared with experimental data for twenty two polymer-organic vapor systems. In almost all cases the Henry constants are reproduced within the limit of experimental error. The effect of pressure on gas solubilities is considered. The effect of polymer-polymer binary interaction parameter on the Henry constant in a gas-polymer-polymer mixture is also discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021871214
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  • 3
    Electronic Resource
    Electronic Resource
    Lyotropic mesophase of imogolite, 1. Effect of polydispersity on phase diagram (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 2883-2893 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The acidic aqueous solution of imogolite is proposed to be an ideal lyotropic system. No temperature dependence was marked on the two phase boundary concentrations (A and B points) of imogolite solutions as predicted by the theories of Flory and Onsager. A satisfactory quantitative agreement was observed with Onsager's theory. The polydispersity of rod lengths was found to shift the A point towards lower concentrations than expected from theory.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021871215
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  • 4
    Electronic Resource
    Electronic Resource
    Lyotropic mesophase of imogolite, 2Part. 1: cf.7.. Microscopic observation of imogolite mesophase (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 2895-2907 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Imogolite, though achiral, forms cholesteric spherulites in the anisotropic phase as shown by the regular striations arranged in a swirl-like or fingerprint pattern observed through a polarizing microscope. Electron microscopy revealed the raft-like imogolite sheet floating in the anisotropic phase. The structure of the imogolite sheet was deduced from periodicities observed by an electron microscope using various imaging conditions. The origin of the twisting force to maintain the cholesteric ordering is also discussed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021871216
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of liquid crystalline polyacrylates and their use in capillary gas chromatography (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1407-1414 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: New enantiotropic liquid crystalline compounds based on 4-(p-substituted phenylazo)phenol and m-cresol esters containing an acryloyloxy group were synthesized. Polyacrylates were prepared from these monomers by radical polymerization. The resulting polymers exhibit nematic enantioropic properties. The polyacrylates have broader nematic ranges and higher nematic to isotropic transition temperatures as compared to their corresponding monomers. The nematic range is dependent on both the lateral substituents and the terminal substituents. The laterally substituted polyacrylates gave a narrower nematic range than unsubstituted compounds. Increase in carbon number in the terminal alkyl group leads to a broader nematic range. The liquid crystalline polyacrylates could be coated uniformly on the inside of a glass capillary tubing. The coated capillary columns show an excellent selectivity in gas chromatography for the separation of isomeric compounds. The liquid crystalline stationary phases are highly stable up to 230°C without column bleeding.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870609
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  • 6
    Electronic Resource
    Electronic Resource
    Syntheses of telechelic oligo- and poly(carboxypiperazine)s (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1415-1422 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(carboxypiperazine) is only accessible via low temperature polycondensation methods. The melting point of the polymer is higher than the temperature of its decomposition. Oligomers with piperidine end groups were prepared to determine the melting points of the pure polymer by extrapolation from the melting points of the oligomers. The decomposition temperatures were determined by thermogravimetry. These studies led to the design of meltable telechelics.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870610
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  • 7
    Electronic Resource
    Electronic Resource
    Dégradation contrôlée des polyisoprènes-1,4 par le couple phénylhydrazine/oxygène, 3Part 2: cf.1.. Molécules modèles de structures phénylhydrazone conjuguées (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1573-1582 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In order to identify phenylhydrazone structures in the reaction products of oxidized polyisoprene or its models with phenylhydrazine, the UV, 1H NMR, 13C NMR and MS spectra as well as the steric exclusion chromatography parameters were determined for phenylhydrazones derived from aldehydes and ketones, selected as models of conjugated carbonyl structures, which could result from the oxidation of polyisoprene units. By comparison with possible coexistent structures, inclusively phenylhydrazones of non-conjugated carbonyl derivatives, oxidized polyisoprene structures can be identified.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870701
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  • 8
    Electronic Resource
    Electronic Resource
    Phase structure and compatibility studies in poly(ethylene oxide)/poly(methyl methacrylate) blends (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1557-1571 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Morphology, crystallinity, and melting behaviour of solution-cast films of poly(ethylene oxide) (PEO)/poly(methyl methacrylate) (PMMA) blends were investigated as a function of composition, using optical and scanning electron microscopy, differential scanning calorimetry, and dilatometry. Up to a content of about 40 wt.-% of PMMA the blend films are completely filled with PEO spherulites, no separated domains of PMMA being observed. This observation suggests, in agreement with small angle X-ray scattering analysis, that for such compositions the PMMA molecules are incorporated in interlamellar regions of PEO spherulites. Blends with higher content of PMMA show islands of crystalline PEO within a matrix of PMMA; large amorphous regions coexist with not well developed PEO spherulites. Addition of PMMA strongly increases the nucleation density for PEO crystals. The solubility parameters δ of PEO and PMMA were calculated from specific volume values as a function of temperature. It was found that at temperatures higher than that of PEO melting the difference δ(PEO) - δ(PMMA) is very low suggesting that the two polymers are compatible in the melt. Compatibility of PEO and PMMA was also predicted by using a theoretical approach which allows to calculate the free energy of mixing as a function of composition and temperature.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870625
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  • 9
    Electronic Resource
    Electronic Resource
    A novel synthesis of polystyrene macromonomers (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1583-1591 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Lithium diisopropylamide (2) was found to undergo a metalation reaction with 4-methylstyrene (1) to form 4-vinylbenzyllithium (3), but to induce neither addition reaction nor vinyl polymerization. The equilibrium constant between 2 and 3 in THF was calculated to be 0,54 at 20°C. The 4-vinylbenzyllithium formed initiates the polymerization of styrene derivatives to form oligomers. The resulting oligomers have a polymerizable vinyl group at the chain end quantitatively and can be regarded as a “macromonomer”. Synthesis of polystyrene, having a primary amino group at the chain end, was carried out through the reaction of polystyrene macromonomer with N-methylethylenediamine. More than 97% of polystyrene were aminated within 6 h reaction.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870702
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  • 10
    Electronic Resource
    Electronic Resource
    The copolymerization of maleic anhydride with propene and isobutene (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1593-1596 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Alternating copolymers were obtained by radical copolymerization of propene (Pr) and isobutene (IB) with maleic anhydride. Both polymers (Pr and IB) do not homopolymerize under the applied reaction conditions. The copolymerization rates were determined.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870703
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