In der vorliegenden Arbeit wurde der Einfluß von Agenzien, die freie Radikale bilden, auf die durch Schwingmahlung mechanochemisch eingeleitete Polymerisation von Styrol untersucht.
Die synthetisierten Polymeren wurden durch Elementaranalyse, IR‐Spektroskopie, ESR‐Spektren, Mössbauerspektren und Differential‐Thermo‐Analyse (DTA) charakterisiert.
Aufgrund der erhaltenen Resultate wurde auf den Mechanismus der mechanochemischen Polymerisation dieses Monomeren geschlossen.
In the case of polyacrylonitrile grafted on kaolin, mica, and volcanic tuff (Fig. 11, the conversion degrees are maximum at 72 h. The effectiveness order of the grafting process given by conversion degree is: kaolin > mica > volcanic tuff.Besides the variation of the conversion, the modification of the grafting degree against the conversion was also followed. The grafting degree was calculated accordingly to the equation grafting degree % = @/a) x 100
Copolymerization of styrene with maleic anhydride and isoprene was mechanochemically initiated by vibratory milling. The influence of time, comonomer ratio and addition of acceptors for radicals on the copolymerization process was investigated. The synthesized copolyniers were analyzed and the polymerization mechanism is discussed.
3lechnnochemisch initiierte Copolymerisat ion. 7. Die Synthese yon Styrencopolymeren durch Schwingmahlung
ZUSAMMENFASSUNG:In der vorliegenden Arbeit werden mechanochemisch eingeleitete Synthesen von bin l e n Copolymeren beschrieben, die durch Schwingmahlung bei Zimmertemperatur unter Verwendung von Vinyl-und Acryl-Comonomeren durchgefilhrt wurden.Der Reaktionsverlauf und die chemische Struktur der Copolymeren werden durch eine Reihe von Faktoren wie Copolymerverhaltnis, Dauer der Schwingmahlung und chemische Natur der Ausgangssubstanzen beeinflufit.Die synthetisierten Copolymeren wurden durch chemische und spektroskopische Methoden analysiert . Die erhaltenen Produkte haben eine Reihe von spezifischenEigenschaften und unterscheiden sich in ihrer Struktur von den Copolymeren, die durch andere Methoden synthetisiert werden.
SUMMARY:The present work describes mechanochemically initiated syntheses of binary copolymers based on vinylic-and acrylic-comonomers by using vibratory grinding at room temperature.The reaction process and the chemical structure of the copolymers are influenced by a number of factors such as copolymer ratio, duration of vibratory grinding, and chemical nature of the basic materials.The obtained copolymers were analyzed by chemical and spectroscopical methods. The copolymers show some special properties and their structure is different from those copolymers synthesized by other methods.
Results concerning the copolymerization of styrene with isoprene and maleic anthydride by vibratory milling are presented. The influence of some mechanochemical parameters (size of the grinding bodies, filling ratio, vibratory amplitude), on the conversions degree is discussed. In order to elucidate the mechanism, the syntheses of the copolymers were carried out in argon, nitrogen and carbon dioxide, and compared with the results in vaccum.
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