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- W2056505718 abstract "The presence of branches in poly(vinyl chloride) as indicated by previous IR measurements on the polymer reduced to polyethylene by means of lithium aluminum hydride is believed to affect materially the morphology and solid state properties of poly(vinyl chloride); however, up to the present, the nature of these branches has not been known. By use of 13C-NMR on reduced poly(vinyl chloride) it is demonstrated that the brances are methyl groups, presumably corresponding to chloromethyl groups in the original polymer. In the sample studied, the frequency is ca. 3 methyl groups per 1000 CH2 groups, but this is expected to depend on the temperature of polymerization. There is also some evidence for long branches, probably not exceeding 1 per 1000 CH2 groups.IR-spektroskopische Untersuchungen von Polyathylen-Proben, dargestellt durch Reduktion von Polyvinylchlorid mit Lithiumaluminiumhydrid, liesen darauf schliesen, das Polyvinylchlorid Seitenketten enthalt, die seine Morphologie und Festkorpereigenschaften wesentlich beeinflussen. Die Natur dieser Seitenketten war bisher unbekannt. Es wird anhand von 13C-NMR Spektren gezeigt, das die Verzweigungen in reduziertem Polyvinylchlorid aus Methylgruppen bestehen, die vermutlich aus Chlormethylgruppen des ursprunglichen Polymeren entstanden sind. Die untersuchte Probe enthielt ca. 3 CH3-Gruppen pro 1000 CH2-Gruppen, jedoch is dieses Verhaltnis vermutlich von der Polymerisationstemperatur abhangig. Zusatzlich wurden Anzeichen fur langere Seitenketten gefunden, die allerdings nur in einem Ausmas von weniger als 1 pro 1000 CH2-Gruppen vorhanden sein durften." @default.
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- W2056505718 date "1975-06-01" @default.
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- W2056505718 title "The nature of the branches in poly(vinyl chloride)" @default.
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