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  • Articles  (212)
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  • 1
    Electronic Resource
    Electronic Resource
    Aromatic Pinacols as Polymerization Initiators (1971)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 10 (1971), S. 386-388 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i360040a008
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  • 2
    Electronic Resource
    Electronic Resource
    Chain transfer constants of some alipathic agents in the polymerization of styrene and methylmethacrylate (1993)
    Springer
    Polymer bulletin 30 (1993), S. 55-60 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The chain transfer constants of various aliphatic compounds in the free radical polymerization of styrene and methyl methacrylate have been determined at 60°C. It has been found that some cycloaliphatic compounds show a remarkable chain transfer activity, which can also be of practical interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296234
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  • 3
    Electronic Resource
    Electronic Resource
    Copolymerisation von Itaconsäuredialkylestern mit Styrol (1963)
    Springer
    Colloid & polymer science 188 (1963), S. 1-4 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary The radical initiated copolymerization of six different dialkyl esters of itaconic acid with styrene was investigated at 60 °C. The composition of the copolymers was determined by UV-spectroscopy; theQ- ande-values according toAlfrey andPrice were calculated and discussed.
    Notes: Zusammenfassung Die radikalische Copolymerisation von sechs verschiedenen Itaconsäuredialkylestern mit Styrol bei 60 °C wird untersucht. Aus den UV-spektroskopisch ermittelten Zusammensetzungen der Copolymeren werden die Copolymerisationsparameter und dieQ- unde-Werte nachAlfrey undPrice berechnet und diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01499594
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  • 4
    Electronic Resource
    Electronic Resource
    Über die chemische Reaktivität vernetzter Perlpolymerisate aus Styrol, p-Jodstyrol und Divinylbenzol (1966)
    Springer
    Colloid & polymer science 211 (1966), S. 8-13 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary Crosslinked bead copolymers from styrene, p-iodostyrene and divinyl benzene can be completely deiodinated under suitable conditions by reaction with n-butyl lithium to yield crosslinked polystyrene. Prerequisite is a sufficient swelling of the beads in the reaction medium which depends on the degree of crosslinking of the polymer and on the solvent used for n-butyl-lithium. The deiodinated polymers swell in benzene to a greater extend than does polystyrene with the same content of divinyl benzene monomer units; this is atributed to the formation of pores in the network by replacement of the large iodine atoms by smaller hydrogen atoms.
    Notes: Zusammenfassung Vernetzte Perlpolymerisate aus Styrol, p-Jodstyrol und Divinylbenzol lassen sich unter bestimmten Bedingungen quantitativ entjodieren durch Umsetzung mit n-Butyllithium. Voraussetzung ist dazu eine hinreichende Quellbarkeit der Perlen in dem verwendeten Reaktionsmedium; dies hängt vom Vernetzungsgrad des Polymeren sowie vom Lösungsmittel für das n-Butyllithium ab. Die entjodierten Polymeren quellen in Benzol stärker als gleich stark mit Divinylbenzol vernetzte Polystyrole, was auf die Bildung von Hohlräumen in den Polymeren durch Ersatz der großen Jodatome durch Wasserstoffatome zurückgeführt wird.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01500204
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  • 5
    Electronic Resource
    Electronic Resource
    Über die Struktur vernetzter Polymerisate aus Styrol, p-Jodstyrol und Divinylbenzol (1967)
    Springer
    Colloid & polymer science 216-217 (1967), S. 321-325 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary From the copolymerization behavior of styrene and divinylbenzene it may be deduced that such copolymers with little divinylbenzene content have a very inhomogeneous network structure; relatively densly crosslinked regions, which are formed during the initial phase of polymerization, are connected via longer crosslink chains. Terpolymers from styrene, p-iodostyrene and small shares of divinylbenzene have similar structures.
    Notes: Zusammenfassung Aus dem Copolymerisationsverhalten von Styrol und Divinylbenzol läßt sich ableiten, daß derartige Copolymere mit geringen Divinylbenzolgehalten eine sehr inhomogene Netzstruktur besitzen; verhältnismäßig dicht vernetzte, im Anfang der Polymerisation gebildete Bereiche sind durch längere Netzketten miteinander verbunden. Ähnlich ist der Aufbau von Terpolymeren aus Styrol, p-Jodstyrol und kleinen Anteilen Divinylbenzol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01525098
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  • 6
    Electronic Resource
    Electronic Resource
    Synthese und Zerfall von Azoinitiatoren, I (1982)
    Springer
    Monatshefte für Chemie 113 (1982), S. 1403-1414 
    Details
    ISSN: 1434-4475
    Keywords: Azoesters, synthesis, decomposition ; Azoisobutyronitrile
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Azoesters of the typePhR 1R2CN=NCR 2R1Ph(R 1=alkyl,R 2=rest of carboxylic acids) were synthesized; their 10h-half-life-temperatures and energies of activation of the decomposition were determined. The decomposition of the azo compounds follows a law of first order. The variation of the substituentsR 1 andR 2 gives information about the effect on the decomposition of the azo compounds. The azoesters of acetic acid are outstanding by low temperatures of decomposition and are situated in the range of azoisobutyronitrile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808940
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  • 7
    Electronic Resource
    Electronic Resource
    Synthese und Zerfall von Azoinitiatoren, II (1983)
    Springer
    Monatshefte für Chemie 114 (1983), S. 37-45 
    Details
    ISSN: 1434-4475
    Keywords: Azoesters ; synthesis ; decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract For further investigation of the relations between the structure and the decomposition of the azoesters of the typePhR 1 R 2CN=CNR 2 R 1 Ph two supplement series (R 1=CH3, C2H5;R 2=substituted acetic acids) were synthesized. Especially information were obtained concerning the reasons for the low temperatures of decomposition of the azoesters of acetic acid. The azoesters of the substituted acetic acids follow a law of first order for the decomposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809374
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchung des Zerfalls verschiedener Azoinitiatoren in Lösung (1979)
    Springer
    Monatshefte für Chemie 110 (1979), S. 699-713 
    Details
    ISSN: 1434-4475
    Keywords: Azo0initiators ; Decomposition rates ; Differential scanning calorimetry (DSC) ; Volumetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The decomposition of various symmetric and unsymmetric azo-initiators (1,1′-dichloro-1,1′-diphenyl-1,1′-azoethane, 2,2′-dichloro-2,2′-azopropane, 1,1′-dichloro-1,1′-azocyclohexane, 2,2′-diacetoxy-2,2′-azopropane, 1,1′-diacetoxy-1,1′-diphenyl-1,1′-azoethane, 1,1′-diacetoxy-1,1′-azocyclohexane, 2,2′-dipropionoxy-2,2′-azopropane, 2,2′-dicapronoxy-2,2′-azopropane, 4,4′-dimethyl-1,4′-azobutyrolactone, azoisobutyronitrile, 2-t-butylazo-2′-cyanobutan, 2-t-bytylazo-1′-cyanocyclohexan) in solution was studied in dependence of temperature. Volumetry and differential-scanning-calorimetry (DSC) were used to determine decomposition rates; first order kinetics was found in all cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00938374
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  • 9
    Electronic Resource
    Electronic Resource
    Dünnschicht-Chromatographie der Methylolmelamine (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 276 (1975), S. 205-207 
    Details
    ISSN: 1618-2650
    Keywords: Trenn. von Methylolaminen, Melaminharzen ; Chromatographie, Dünnschicht ; Celluloseschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Identifizierung der Komponenten in einem Methylolmelamin-Gemisch mittels Dünnschicht-Chromatographie wurde möglich, nachdem die einzelnen Methylolmelamine (Mono-, Di-, Tri-, Tetra-, Penta- und Hexamethylolmelamin) rein dargestellt werden konnten. Aus der zweidimensionalen dünnschichtchromatographischen Entwicklung des Methylolmelamin-Gemisches folgt, daß während der Dauer der Entwicklung keine Änderung der Zusammensetzung des Methylolmelamin-Gemisches stattfindet. Die Chromatographie wurde auf Celluloseschichten mit Butanol/Äthanol/Wasser (4∶1∶2) als Fließmittel und ammoniakalkalischer Silbernitratlösung als Nachweisreagens durchgeführt.
    Notes: Abstract Identification of the components in a methylolmelamine mixture by thin-layer chromatography was facilitated after obtaining each of the individual methylolmelamines (mono-, di-, tri-, tetra-, penta- and hexamethylolmelamine). By the use of two-dimensional thin-layer chromatography it was noted that no change in the composition of the mixture takes place during the time of Chromatographic development. Separation was achieved on cellulose layers using butanol/ethanol/water (4∶1∶2) as solvent and ammonia-alkaline AgNO3 solution as detection reagent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437568
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  • 10
    Electronic Resource
    Electronic Resource
    Über den dünnschichtchromatographischen Nachweis von phenolischen Komponenten in Weichmachern (1965)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 207 (1965), S. 26-30 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The separation and identification of phenol and the isomeric cresols and xylenols by thin-layer chromatography on silica gel plates impregnated with formamide is described. The method is applicable to the direct analysis of phenols from saponificated plasticizers.
    Notes: Zusammenfassung Es wird ein einfaches Verfahren zur Dünnschichtchromatographie von Phenol sowie isomeren Kresolen und Xylenolen auf formamidimprägnierten Kieselgel-G-Platten beschrieben. Die Methode läßt sich direkt auf die Analyse solcher Weichmacher anwenden, bei deren Verseifung Phenole entstehen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00538250
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