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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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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Gelchromatographische Trennung von Oligostyrolen (1968)
    Springer
    Colloid & polymer science 224 (1968), S. 11-17 
    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 Cationicly prepared oligostyrene mixtures can be separated into the individual oligomers (dimers to pentamers) by gelchromatography employing a gel of methylmethacrylate and 2 mole-% ethyleneglykoldimethacrylate. The fractionation can be followed qualitatively by UV-spectroscopy and quantitatively by gaschromatographic analysis of the eluates. — Tristyrenes, tetrastyrenes, and pentastyrenes can be isolated in preparative quantities by the gelchromatographic method from the oligomer mixtures obtained from styrene and dilute sulfuric acid; however, the individual fractions thus obtained are not uniform but consist of isomer mixtures.
    Notes: Zusammenfassung Kationisch hergestellte Oligostyrol-Gemische lassen sich gelchromatographisch an einem Gel aus Methylmethacrylat und 2 Mol.-% Äthylenglykoldimethacrylat in die einzelnen Oligomeren (Diniere bis Pentamere) auftrennen. Die Fraktionierung kann qualitativ durch UV-Spektroskopie sowie quantitativ durch Gaschromatographie der Eluate verfolgt werden. Aus den aus Styrol mit verdünnter Schwefelsäure erhaltenen Oligomergemischen lassen sich präparativ-gelchromatographisch Tristyrole, Tetrastyrole und Pentastyrole isolieren, die jedoch nicht einheitlich, sondern Isomerengemische sind.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01542384
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  • 3
    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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Oligomers of α-methylstyrene by initiation with tetraphenylethanes (1986)
    Springer
    Polymer bulletin 16 (1986), S. 19-26 
    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 With substituted tetraphenylethanes as polymerization initiators, telechelic oligomers of ∝ -methylstyrene were obtained above ceiling temperature, contrary so far to other free radical reactions using e.g. chain transfer agents. In the here investigated system tetraphenylethanes act as initiators and terminating agents. The C-C bond between the last monomer unit of the oligomer and the terminating end group from the initiator can be thermally cleaved at about 50°C which produces free radcials. Thus, these ∝ -methylstyrene oligomers can be applied as initiators of freeradical polymerization, e.g. for styrene or methyl methacrylate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01046604
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Über die Darstellung einiger p-substituierter Styrolderivate (1963)
    Springer
    Monatshefte für Chemie 94 (1963), S. 1250-1261 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Es wird die Darstellung von p-Isopropylstyrol und p-(β-Bromäthyl)-styrol aus den entsprechenden Methylaryl-carbinolen beschrieben. Ausgehend von p-(β-Bromäthyl)-styrol sind p-Äthinylstyrol und p-Divinylbenzol zugänglich. Ferner wird über einige Untersuchungen zur Dehydratisierung von Methylaryl-carbinolen berichtet, wobei verschiedene, z. T. bisher unbekannte Di-α-aryl-äthyl-äther isoliert wurden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00905720
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  • 8
    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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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Polymerisation von α-Methylstyrol durch Bestrahlung mit Elektronen (1964)
    Springer
    Colloid & polymer science 194 (1964), S. 2-4 
    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 polymerization in bulk ofα-methylstyrene induced by irradiation with electrons is studied. From investigations of the polymerization and polymer tacticities by nuclear magnetic resonance it is concluded that the polymerization takes place by a kationic mechanism.
    Notes: Zusammenfassung Es wird die durch Elektronenbestrahlung ausgelöste Substanzpolymerisation vonα-Methylstyrol beschrieben. Auf Grund der Untersuchungen des Polymerisationsverlaufes und der Taktizitäten der Polymeren mit Hilfe der magnetischen Kernresonanz wird ein kationischer Mechanismus angenommen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01499969
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