Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • EVA  (1)
  • Enthalpy-entropy compensation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The use of thermal and spectroscopic methods to study chemically modified materials (1992)
    Springer
    Journal of thermal analysis and calorimetry 38 (1992), S. 361-379 
    Details
    ISSN: 1572-8943
    Keywords: chemically modified materials ; EVA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Anhand verschiedener Beispiele wird die Anwendung thermischer und spektroskopischer Methoden zur Charakterisierung chemisch modifizierter Materialien gezeigt: Ethylenvinylacetatkopolymere (hydrolysiert unter alkalischen Bedingungen), Amosit Asbestfasern (nach zuvoriger Reaktion mit Alkyldimethylchlorsilanen) und polymère Verbundwerkstoffe (nach zuvoriger Einwirkung von Feuchte).
    Notes: Abstract The application of thermal and spectroscopic techniques in the characterisation of chemically modified materials is illustrated with several examples: ethylene vinyl acetate (EVA) copolymers which had been hydrolysed under alkaline conditions, amosite asbestos fibres which had been reacted with alkyldimethylchlorosilanes, and a polymeric composite material which had been affected by moisture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01915501
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Influence of temperature and mobile phase composition on retention properties of oligomeric bonded phases in reversed-phase liquid chromatography (RPLC) (1997)
    Springer
    Chromatographia 44 (1997), S. 135-144 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Oligomeric stationary phases ; Enthalpy-entropy compensation ; Methylene and phenyl selectivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The effect of temperature and mobile phase composition (methanol-water) on the retention behaviour of an oligomeric series of n-octylsilyl bonded phases in reversed-phase liquid chromatography has been investigated. Plots of lnk against 1/T (van't Hoff plot) and the enthalpy of transfer (ΔHo) yields linear relationships under the conditions studied. The ΔHo values of the aromatic hydrocarbons and n-alkyl benzoates are higher than those of the polar compounds due to their higher level of interaction with the stationary phase. A linear plot of ΔHo vs. ΔSo suggest that the retention process, which is essentially controlled by non-specific (dispersive) interactions between the solutes and the bonded ligands, is identical for all cases evaluated. The existence of similar retention mechanisms is confirmed by the constant value of the enthalpy-entropy compensation temperature of the columns for a given class of componds. As expected, decreasing the methanol content (% v/v) of the mobile phase results in increased eluite retention times. The methylene and phenyl selectivities are found to be independent of the carbon content of the stationary phases and varied only with the eluent composition. In addition to their high stability under aggressive mobile phase conditions as previously reported, the results of this study generally showed that the solute retention process on oligomeric phases are similar to those exhibited by the conventional reversed phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466447
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...