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- W2142470166 abstract "The infrared spectra of stereoregular polyn-butyl,-isobutyl,-sec-butyl, and -tert-butyl acrylates has been examined in the range from 3500 to 700 cm−1. Poly(n-butyl acrylate) prepared by an anionic catalyst was found to show only diffused rings in its X-ray photograph taken at room temperature, but the infrared spectrum of the polymer differs clearly from that of the authentic amorphous polymer. The poly(acrylic acid) obtained by hydrolysis of the n-butyl acrylate polymer exhibited discrete DEBYE-SCHERRER'S rings in its X-ray photograph. With the aid of X-ray analysis, these crystalline or stereoregular poly-butyl acrylates has been found to be isotactic, whose polymer chains has a three-fold screw-axis in the crystalline state. The infrared spectrum of the stereoregular poly-n-butyl acrylate has been found to contains no crystallization sensitive bands, which are ascribed to intermolecular interactions, as expected from the above results. Frequency shifts were observed in the various modes concerned with n-butyl, isobutyl, sec-butyl and tert-butyl groups. Die Infrarotspektren der stereoregulären Poly-n-butyl-, -isobutyl-, -sec-butyl- und -tert-butylacrylate werden im Bereich von 3500 bis 700 cm−1 untersucht. Es wird gefunden, daß das mit einem anionischen Katalysator hergestellte Poly-n-butylacrylat in seiner Röntgenaufnahme bei Zimmertemperatur nur diffuse Ringe zeigt. Das Infrarotspektrum des Polymeren weicht offensichtlich von dem des authentischen Polymeren ab. Die durch Hydrolyse dieses n-Butylacrylats hergestellte Polyacrylsäure zeigt in der Röntgenaufnahme diskrete DEBYE-SCHERRER-Ringe. Mit Hilfe der Röntgenanalyse ließ sich feststellen, daß diese kristallinen bzw. stereoregulären Polyacrylsäurebutylester im kristallinen Zustand isotaktische Strukturen haben, deren Polymerkette eine dreifache Schraubenachse besitzt. Das Infrarotspektrum des stereoregulierten n-Butylacrylats hat keine für die Kristallisation empfindlichen Banden, die einer zwischenmolekularen Wechselwirkung zugeschrieben werden, wie es auch nach den vorliegenden Resultaten vermutet wurde. Bei verschiedenen Schwingungsbanden der n-Butyl-, Isobutyl-, sec-Butyl- und tert-Butylgruppen wurden Frequenzverschiebungen festgestellt." @default.
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- W2142470166 date "1961-01-01" @default.
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- W2142470166 doi "https://doi.org/10.1002/macp.1961.020490108" @default.
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