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- W1940050857 abstract "The structure formation during transition from the quenched into the crystalline state has been studied for isotactic polypropylene by wide-angle X-ray scattering. Based on the temperature dependence of the shape of the curve of amorphous scattering the composition of samples with different degrees of crystallinity and different content of paracrystalline form was determined quantitatively. By means of IR spectroscopy it was shown that stretching of quenched polypropylene leads to the freezing of the conformational array in macromolecules. This freezing hinders the transition into the crystalline state upon heating. Durch Röntgenweitwinkelstreuung wurde die Strukturbildung des isotaktischen Polypropylens beim Übergang vom abgeschreckten in den kristallinen Zustand untersucht. Anhand der Temperaturabhängigkeit der Gestalt der amorphen Streukurve wurde die Zusammensetzung von Proben mit unterschiedlichem Kristallinitätsgrad und unterschiedlichem parakristallinen Anteil quantitativ bestimmt. Mit Hilfe der IR-Spektroskopie wurde gezeigt, daß die Verstreckung des abgeschreckten Polypropylens das Einfrieren der Konformationsordnung der Makromoleküle bewirkt. Dieses Einfrieren behindert den Übergang in den kristallinen Zustand beim Erwärmen." @default.
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- W1940050857 date "1985-06-01" @default.
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- W1940050857 doi "https://doi.org/10.1002/actp.1985.010360602" @default.
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