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  • 1
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experiments on three double-layer (n=2) Ruddlesden–Popper (RP) systems are reported. Doping Sr1.8La1.2Mn2O7 (Tc=126 K) with Nd to form Sr1.8La1.2−xNdxMn2O7 leads to a reduction in Curie temperature for low doping levels (x=0.2), and to behavior reminiscent of Sr1.8Nd1.2Mn2O7 for x≥0.7. This suggests that it may be possible to control the temperature of maximum magnetoresistance chemically in these phases. The application of pressure (0〈P/GPa≤1.8) is shown to modify the magnetotransport properties of Sr2NdMn2O7 to resemble those of Sr1.9Nd1.1Mn2O7. The changes can be explained by considering the relative strength of ferromagnetic and antiferromagnetic interactions within the material. Finally, the need for careful phase analysis of n=2 RP materials is demonstrated by the misleading magnetization data recorded for a sample of Sr1.8Sm1.2Mn2O7 containing ∼2.8% of an n=∞ perovskite phase. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 230 (1995), S. 99-104 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Eine Reihe von Harzen des Novolak-Typs wurden durch Reaktion von Formaldehyd mit verschiedenen Phenoxy-Essigsäuren hergestellt, indem HCl als Katalysator eingesetzt wurde. Alle synthetisierten Harze wurden IR-spektroskopisch und viskosimetrisch untersucht; das zahlenmittlere Molekulargewicht wurde mit Hilfe der Dampfdruckosmometrie bestimmt. Zwei der Harzproben wurden zum Vernetzen von Epoxidharzen eingesetzt, um die Kinetik der Vernetzung mittels DSC-Untersuchungen zu studieren. Die vernetzten Epoxide wurden hinsichtlich ihrer thermischen Stabilität geprüft. Die hergestellten Harze verleihen dem Epoxidsystem eine sehr gute Hitzebeständigkeit.
    Notes: A series of novolak type resins were prepared by reacting formaldehyde with various phenoxy acetic acids using HCl as catalyst. All the synthesized resins were characterized by spectral studies (IR), viscometric measurements and by estimating the numberaverage molecular weight by vapour-pressure osmometry. Two of these resin samples were used as curing agents for epoxy resins for studying the kinetics of curing by DSC technique. The cured epoxies were tested for thermal stability. These resins impart very good heat resistance to epoxy systems.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 241 (1996), S. 31-40 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Friedel-Crafts-Reaktion von 2-Chloranisol mit Chloracetylchlorid und 1,2-Dichlorethan oder Dichlormethan mit wasserfreiem Aluminiumchlorid als Katalysator und Kohlenstoffdisulfid als Lösungsmittel wurden unter verschiedenen experimentellen Bedingungen sieben Polyketone hergestellt. Diese wurden mittels IR-Spektroskopie, Dampfdruckosmometrie, Thermogravimetrie und Differentialkalorimetrie charakterisiert; der Chlorgehalt wurde nach Carius bestimmt. Die Polyketone wurden hinsichtlich ihrer antimikrobiellen Eigenschaften gegen ausgewählte Mikroorganismen untersucht. Die Ergebnisse weisen darauf hin, daß einige dieser Harze gute antimikrobielle Eigenschaften gegenüber den untersuchten Mikroorganismen aufweisen und möglicherweise als Biozide kommerziell eingesetzt werden können.
    Notes: A series of seven polyketones was prepared by Friedel-Crafts reaction using 2-chloroanisole, choroacetyl chloride, 1,2-dichloroethane and dichloromethane with anhydrous aluminium chloride as catalyst and carbon disulfide as a solvent under different experimental conditions. The polyketones thus obtained were characterized by determination of the chlorine content (Carius method), IR spectroscopy, vapour-pressure osmometry, thermogravimetry and differential scanning calorimetry. All these polyketones were tested for their antimicrobial properties against selected microorganisms. The results indicate that some of these resins show fair to good antimicrobial properties towards tested microorganisms and may be used as commercial biocides.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 4
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