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- W4249251063 abstract "An extensive investigation of the main parameters regulating the copolymerization of isobutene and isoprene, initiated by the catalyst system diethylaluminium chloride + chlorine in methyl chloride, was carried out. The influence of the concentration of the catalyst components, of the monomers, of 1-butene, and of the polymerization temperature on the yield, the molecular weight and the composition of the copolymer was studied. The reactivity ratio of isobutene with respect to isoprene is 2,5 ± 0,5 at −35°C. The activation energy M is −23,9 ± 3 kJ/mol and −18,0 ± 2 kJ/mol (−5,7 ± 0.7 and −4,3 ± 0,5 kcal/mol) for the copolymer with a mole fraction of 0,013 and 0,019, respectively, of isoprene, and −24,3 ± 2 kJ/mol (−5,8 ± 0,4 kcal/mol) for polyisobutylene. The results are compared with similar data obtained for the system diethylaluminium chloride + tert-butyl chloride and diethylaluminium chloride + hydrogen chloride. The influence of water on the activity of the catalyst was investigated briefly and discussed. Some technological data obtained with typical copolymers are also reported. Die wichtigsten Parameter, die die Copolymerisation von Isobuten mit Isopren bei der Initiierung durch das katalytische System Diäthylaluminiumchlorid + Chlor in Methylchlorid steuern werden untersucht, sowie der Einfluß der Konzentration der Katalysatorbestandteile, der Monomeren, des 1-Butens und der Polymerisationstemperatur auf die Ausbeute, das Molekulargewicht und die Zusammensetzung des Copolymeren. Der Copolymerisationsparameter von Isobuten, bezogen auf Isopren, bei −35°C beträgt 2,5 ± 0,5. Die Aktivierungsenergie EM beträgt −23,9 ± 3 kJ/mol und −18,0 ± 2 kJ/mol (−5,7 ± 0,7 und −4,3 ± 0,5 kcal/mol) für das Copolymere mit einem Molenbruch von 0,013 bzw. 0,019 an Isopren, und −24,3 ± 2 kJ/mol(−5,8 ± 0,4 kcal/mol) fur Polyisobutylen. Die Ergebnisse werden mit ahnlichen Angaben für die Systeme Diäthylaluminiumchlorid + tert-Butylchlorid sowie Diäthylaluminiumchlorid + Chlorwasserstoff verglichen. Der Einfluß von Wasser auf die Katalysatoraktivität wird kurz untersucht und erörtert. Außerdem werden einige technologische Daten über typische Copolymere berichtet." @default.
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- W4249251063 date "1975-08-01" @default.
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- W4249251063 doi "https://doi.org/10.1002/macp.1975.021760813" @default.
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