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  • 1
    Electronic Resource
    Electronic Resource
    Thermal stability of epoxy compounds cured with boron trifluoride complexes (1984)
    Springer
    Journal of thermal analysis and calorimetry 29 (1984), S. 965-969 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der WÄrmewiderstand von mit Komplexen von Bortrifluorid mit Benzylamin, 2-Benzylamino-Äthanol und 2-Anilino-Äthanol gehÄrteten Epoxyharzen wurde untersucht. Anhand thermoanalytischer Daten wurden die WÄrmewiderstandswerte von mit (aliphatischen und aromatischen) Polyaminen, SÄureanhydriden und Komplexen von Bortrifluorid mit den oben angeführten Aminen gehÄrteten Epoxy-Kompositionen miteinander verglichen.
    Abstract: РЕжУМЕ ИсслЕДОВАНА тЕРМОУс тОИЧИВОсть ЁпОксИсМ Ол, ОтВЕРжДЕННых кОМплЕ ксНыМИ сОЕДИНЕНИьМИ тРЕхФт ОРИстОгО БОРА с БЕНжИ лАМИНОМ, 2-БЕНжИлАМИНОЁтАНОлО М И 2-АНИлИНЁтАНОлОМ. ДАННыЕ тЕРМИЧЕскОгО АНАлИжА БылИ сОпОстА ВлЕНы с тЕРМОУстОИЧИВОстьУ ЁтИх жЕ ЁпОксИДНых сМОл, От ВЕРжДЕННых АМИНАМИ (АлИФАтИЧЕскИМИ И АРО МАтИЧЕскИМИ) И АНгИДРИДАМИ кИслОт.
    Notes: Abstract The thermal resistances of epoxy resins cured with complexes of boron trifluoride with benzylamine, 2-benzylaminoethanol and 2-anilinoethanol were examined. Thermal analysis data were used to compare the thermal resistances of epoxy compusitions cured with polyamines (aliphatic and aromatic), acid anhydrides and complexes of boron trifluoride with the above amines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02188844
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  • 2
    Electronic Resource
    Electronic Resource
    Concentration effects and thermodynamic nonideality in gel chromatography (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 21 (1983), S. 1903-1912 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dependence of the elution volume Ve on the concentration of injected polymer c in gel chromatography is presented for several systems including poly(styrene) and poly(methyl methacrylate) in a number of pure solvents with SiO2-based gels. The linear dependence of Ve on c and Kav on c (where Kav is the distribution coefficient) is confirmed in the region of very low concentration. The slopes k of the straight lines increase with increasing relative molecular masses M of the polymer injected and with increasing thermodynamic nonideality of the system (as expressed by the second virial coefficient A2). The significance of the slope of the GPC calibration curve for meaningful comparison of the concentration effects in various chromatographic systems is pointed out. A recently found correlation between k and (A2M)γ is confirmed with a γ value of about 0.8. A possible theoretical explanation for the deviation of γ from unity is discussed. Finally, the influence of both the polymer concentration and the thermodynamic quality of the eluent on the resolution index of the chromatographic system is evaluated with the conclusion that thermodynamically poor solvents should be preferred for preparative GPC separations with very high loads.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.180211003
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  • 3
    Electronic Resource
    Electronic Resource
    A viscometric study of solutions of poly(methyl methacrylate) and polystyrene in N,N-dimethylformamide and its mixtures with inorganic salts (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 93-96 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Lösungseigenschaften von Poly(methylmethacrylat) und Polystyren in reinem N,N-Dimethylformamid (DMF) und in Lösungen von LiCl, LiBr und KSCN in DMF wurden viskosimetrisch untersucht. Die Lösungsmittelgüte des DMF wird für beide Polymere durch die gelösten Salze verschlechtert. Der „salting-out“-Effekt steigt in der Reihenfolge LiCl 〈 LiBr 〈 KSCN für Poly(methylmethacrylat) und LiBr ≈ KSCN 〈 LiBr für Polystyren.
    Notes: The solution properties of poly(methyl methacrylate) and polystyrene dissolved in N,N-dimethylformamide (DMF) and in DMF solutions of LiCl, LiBr and KSCN were studied viscometrically. The solvent power of DMF for both polymers is decreased by the salts. The salting-out effect increases in the series LiCl 〈 LiBr 〈 KSCN with poly(methyl methacrylate) and LiCl ≈ KSCN 〈 LiBr with polystyrene.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370208
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  • 4
    Electronic Resource
    Electronic Resource
    Cyclohexanone/1,2-dichloroethane as eluents in GPC of polymers (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 477-482 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Änderung des Elutionsvolumens und der Trennfähigkeit wurde für Polystyrenstandards und fraktioniertes Poly(methyl-methacrylat) in Cyclohexanon, 1,2-Dichlorethan und deren Mischungen an einer silanisierten porösen Glasfüllung untersucht. Trotz sorgfältiger Auswahl des Lösungsmittelpaares verursachten die unterschiedlichen Wechselwirkungen in dem Systems Gel-Eluent-Polymer sekundäre Drscheinungen, wie Adsorption und Verteilung der Makromoleküle, wodurch eine Bestimmung des Zusammenhangs zwischen Viskosität des Lösungsmittels und Elutions volumen nicht möglich war.
    Notes: The changes in GPC elution volumes and separation efficiency were studied for polystyrene reference materials and poly(methyl methacrylate) fractions with cyclohexanone, 1,2-dichloroethane and their mixtures as eluents and silanized CPG-10 porous glass as packing. Despite careful selection of the pair of the solvents interaction differences in the system gel-eluent-polymer caused such secondary phenomena as adsorption and/or partition of macromolecules and do not allow to determine the influence of solvent viscosity on the elution volumes of polymers in GPC.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330807
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