Es wurden Nanokomposite auf Basis von Dienkautschuken und beschichteten Kaolinen, die mit einem quaternären Ammonium-Alkyl-Kation modifiziert waren (Organokaolin) hergestellt. Ein Dienkautschuk, entweder Polybutadien oder synthetisches oder natürliches Polyisopren, oder Styrol-Butadien-Copolymer, wurde in der Schmelze mit einem vorgefertigten Organokaolin oder einem Gemisch aus reinem Kaolin und dem Ammonium-Kation verschnitten. Neben isolierten Lamellen zeigten die Nanokomposite die Gegenwart von kristallinen Organokaolinen mit interkalierten organischen Schichten, die nur aus niedermolekularen Substanzen, vor allem dem Ammonium-Kation bestanden. Es gab jedoch keine Anzeichen einer Interkalation von Polymerketten. Die dynamisch-mechanischen Eigenschaften von mit Schwefel vulkanisierten Mischungen, die Ruß als Hauptfüllstoff und eine geringere Menge an Organokaolin enthielten, wurden untersucht. Es wurde festgestellt, dass der Organokaolin die Mooney-Viskosität herabsetzt und den Speichermodul bei niedriger Temperatur ebenso wie die Thermoplastizität erhöht.
Nanocomposites were prepared based on diene rubbers and layered clays modified with an alkyl quaternary ammonium cation (organoclay). A diene rubber, either polybutadiene, or synthetic or naturally occurring polyisoprene or styrene-butadiene copolymer, was melt-blended with either a preformed organoclay or with a mixture of pristine clay and ammonium cation. Besides isolated lamellae, nanocomposites showed the presence of crystalline organoclays with intercalated organic layers made only by low molecular mass substances, essentially the ammonium cation, and no evidences for the intercalation of polymer chains were observed. Dynamic mechanical properties of sulphur-cured compounds with carbon black as the main filler and a minor amount of organoclay were investigated. The organoclay was found to bring about a reduction of Mooney viscosity, an increase of storage modulus at low temperature as well as an increase of thermoplasticity.
Reinforcement of diene elastomers by organically modified layered silicates [Verstärkung von dienelastomeren durch organisch modifizierte, geschichtete silikate]
Conzatti L;Costa G;
2010
Abstract
Nanocomposites were prepared based on diene rubbers and layered clays modified with an alkyl quaternary ammonium cation (organoclay). A diene rubber, either polybutadiene, or synthetic or naturally occurring polyisoprene or styrene-butadiene copolymer, was melt-blended with either a preformed organoclay or with a mixture of pristine clay and ammonium cation. Besides isolated lamellae, nanocomposites showed the presence of crystalline organoclays with intercalated organic layers made only by low molecular mass substances, essentially the ammonium cation, and no evidences for the intercalation of polymer chains were observed. Dynamic mechanical properties of sulphur-cured compounds with carbon black as the main filler and a minor amount of organoclay were investigated. The organoclay was found to bring about a reduction of Mooney viscosity, an increase of storage modulus at low temperature as well as an increase of thermoplasticity.File | Dimensione | Formato | |
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