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  • calorimetric titration  (1)
  • poly(ethylene terephthalate), laser-treated, surface characterization by optical profilometry and scanning tunneling microscopy of  (1)
  • Theoretical, Physical and Computational Chemistry
  • 1990-1994  (2)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Influence of ligand structure and solvent effects on complexation of neutral guests by several crown ethers (1994)
    Springer
    Journal of solution chemistry 23 (1994), S. 53-61 
    Details
    ISSN: 1572-8927
    Keywords: Crown ethers ; benzocrown ethers ; non-charged complexes ; host-guest complexes ; calorimetric titration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The formation of complexes between crown ethers and acetonitrile, chloroform, and nitromethane were investigated in carbon tetrachloride at 25°C. A significant influence of the ring size on the selectivity of the host is evident. The host 18-crown-6 forms complexes for which the reaction enthalpy and entropy are quite high. Host molecules with benzene side groups form complexes of lower reaction enthalpy and entropy and therefore the complexes formed are less stable than that of the analogous crown ethers without aromatic groups. Solvent effects on the stability constant K, the reaction enthalpy ΔH, and the reaction entropy ΔS were studied for the complexation of malonitrile by 18-crown-6. The reaction enthalpy and entropy values change in accordance with the dielectric constant of the solvent used, but no overall effect on complex stability with change in solvent dielectric constant was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00972607
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  • 2
    Electronic Resource
    Electronic Resource
    Surface characterization of laser-treated poly(ethylene terephthalate) by optical profilometry and scanning tunneling microscopyExtract from graduate dissertation of L. Wefers. (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 23-27 
    Details
    ISSN: 0887-6266
    Keywords: Surface characterization of laser-treated PET ; poly(ethylene terephthalate), laser-treated, surface characterization by optical profilometry and scanning tunneling microscopy of ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Characteristic changes in the surface topography due to UV laser treatment are of high significance for the determination of material destruction thresholds and surface structure development. E.g. irradiation of poly(ethylene terephthalate) (PET) film with pulsed UV laser light of 248 nm modifies the smoth surface of the polymer into a well oriented structured surface. The development of these structures were studied with scanning tunneling microscopy (STM) and high resolution optical profilometry. Three dimensional data of the surface were taken from the samples after each laser pulse. A change of topographic data was found in relation to fluence and number of pulses applied. © 1993 John Wilcy & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090310104
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