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  • Polymer and Materials Science  (5)
  • dielectric relaxation  (1)
  • dielectric spectroscopy  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A dielectric study of 1-alcohol — tetraethyl orthosilicate mixtures (1991)
    Springer
    Journal of solution chemistry 20 (1991), S. 1149-1157 
    Details
    ISSN: 1572-8927
    Keywords: Tetraethyl orthosilicate ; ethanol ; 1-propanol ; 1-butanol ; sol-gel ; dielectric spectroscopy ; dielectric relaxation ; ceramics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Dielectric properties of mixtures of 1-alcohols (ethanol, 1-butanol and 1-hexanol) and tetraethyl orthosilicate (TEOS) were determined by means of the time domain method (TDS). To all spectra were fitted a model function containing a sum of three debye relaxation terms with fixed τ2 and τ3. Initially, to 2–3 mole%, TEOS did not influence static permittivity nor main relaxation time of the alcohol. For higher concentrations there is a linear decrease in both these parameters. Qualitatively the effects of TEOS are comparable with those of a nonpolar hydrocarbon on the alcohol structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01075132
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular location in a nonaqueous lyotropic liquid crystal polymer (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 3575-3585 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A surfactant bis[2-(10-undecenoyloxycarbonyl)ethyl] (p-vinylbenzoyl) methylammonium chloride formed a lamellar liquid crystal in native form and retained the structure after polymerization. Addition of heptadiene, of glycerylmonomethacrylate, and of both to the surfactant monomer gave an isotropic solution, which was transformed to a lamellar liquid crystal after polymerization. Low angle X-ray diffractometry was used to determine the interlayer spacing and to estimate the location of the added molecules. 1.6-Heptadiene was located between methyl group layers of the surfactant chains with 46 vol % of the molecules penetrating between the hydrocarbon chains of the surfactant. Addition of both the polar and the nonpolar monomer followed by polymerization caused the latter to be expelled from the space in between the chains.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1990.080281305
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Solubility of non-polar polymers in microemulsions I. Solubility of oligomers (1981)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 1585-1587 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1981.170190630
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    W/O microemulsions of styrene monomer and dimer (1984)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 22 (1984), S. 1699-1705 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reason for the lower water solubility in W/O microemulsions of the styrene dimer, trans, trans-1,4-diphenyl-1,3-butadiene, in comparison with the monomer was investigated by determining the phase equilibria in the microemulsion system with pentanol as the cosurfactant and sodium dodecyl sulfate as the surfactant. The main factor for the low tolerance for water in the system was the incompatibility of the dimer with the cosurfactant and surfactant.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1984.170220715
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  • 5
    Electronic Resource
    Electronic Resource
    Polymerization in lyotropic liquid crystals. I. Change of structure during polymerization (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 2629-2640 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polymerization was made at 60°C in a lyotropic liquid crystal of sodium undecenoate and water. The liquid crystalline structure prior to polymerization was identified by optical microscopy and low-angle x-ray diffraction as an array of hexagonal closely packed cylinders with the hydrophobic part of the soap in the center of the cylinders. During polymerization the structure became isotropic at 60°C. Cooling to 20°C transformed the structure to a lamellar liquid crystal-a reversible transition. The structure of the lamellar phase was interpreted as a polyethylene backbone from which deformed decanoate chains reached toward the aqueous layer. Molecular models showed the model to accept head-tail, head-head, and tail-tail configurations in cis and trans conformations with the exception of the cis tail-tail configuration.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.170180821
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  • 6
    Electronic Resource
    Electronic Resource
    Styrene and polystyrene microemulsions. I. Solubility in the W/O system (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 513-523 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The solubility of styrene, its oligomers, and different molecular weight polymers was determined in W/O microemulsions stabilized by sodium dodecyl sulfate and pentanol. The results showed a complex pattern due to the interactions with pentanol, surfactant, and associated structures.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170210219
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    Paper (German National Licenses)
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