Kautschuke

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Kautschuke

Study of the Epoxidation of Polydiene Rubbers I

The epoxidation of SBR was carried out using performic acid generated in situ. In order to optimize the epoxidation reaction, kinetic studies were carried out and the impact of different reaction parameters was determined. It was demonstrated that the epoxidation of SBR corresponds to a first order reaction relative to the content of double bonds. […] mehr...

28.April 2003 - Neues aus der Forschung

Kautschuke

Improving the Heat Resistance of Hydrogenated Nitrile Rubber Compounds – Part 1: Aging mechanisms for high saturation rubber compounds

Aging mechanisms for hydrogenated nitrile rubber (HNBR) and ethylene propylene rubber (EPM) compounds under severe oxidative conditions are discussed. Based on results from compounding studies and analytical experiments, the importance of balancing the molecular parameters affecting the HNBR microstructure for optimum long-term performance is highlighted. Verbesserung der Hitzebeständigkeit von hydriertem NitrilkautschukAlterungsmechanismen für Mischungen basierend auf […] mehr...

28.April 2003 - Neues aus der Forschung

Kautschuke

Influence of the Amount of Di- and Polysulfane Silanes on the Crosslinking Density of Silica-Filled Rubber Compounds1

The main focus of this paper is the description of the competition between the silica-to-rubber coupling and the matrix crosslinking for the added free sulfur during vulcanization. Therefore two statistical design experiments with a variation of the amount of the sulfur – functional silanes Si 69, respectively Si 266, were performed.. It was observed that […] mehr...

28.April 2003 - Neues aus der Forschung

Teil 2 am Beispiel Rhepanol O.R.G.1auf Basis Polyisobutylen (PIB)

Diffusion von Wasserdampf in polymeren Auskleidungswerkstoffen

Die Bestimmung des Diffusionskoeffizienten, der zeitabhängigen Eindringtiefen und des Anteils immobilisierten Wassers bei der Wasserabsorption durch Rhepanol ORG (PIB schwarz gefüllt) bei 70°C wird vorgestellt. Der immobilisierte Wasseranteil wird mit dem Einbau an Füllstoffoberflächen oder in Mikroporen gedeutet. Rhepanol ORG zeigt einen sehr niedrigen Wasserdampf-Diffusionskoeffizienten, der aus dem hohen Anteil an Füllstoffen, plättchenförmigem Graphit und […] mehr...

28.April 2003 - Neues aus der Forschung

Kautschuke

Rheological Properties of Multiblock Ether-Ester Copolymers

The paper deals with development of the rheological properties of poly(ether-ester) elastomers. The various types of Elitels and effects of shear rate on viscosity and a comparison of the rheological properties of different grades of Elitels have been included. The study were carried out by using MFI (CEAST), Capillary Rheometer MCR (Instron), and Bypass Capillary […] mehr...

28.April 2003 - Neues aus der Forschung

Kautschuke

Flocculation in Carbon Black Filled Rubber Compounds1

The properties of carbon black filled rubber compounds are greatly influenced by the extent of filler microdispersion. Dispersion takes place during mixing where carbon black pellets are broken up under shear forces into individual aggregates/agglomerates and distributed throughout the polymer matrix. After the mixing process, both the polymer and filler matrices can rearrange, leading to […] mehr...

28.April 2003 - Neues aus der Forschung

A new Method for Measuring the Processability of a Rubber Compound

Processability Tester

A new method and measuring device to investigate the processability of rubber compounds (PROCESSABILITY TESTER) is presented. The purpose of the new test method is to investigate the processability of compounds within the scope of extrusion and profile shaping. The measuring device is based on a specifically configured cold fed pin barrel extruder which is […] mehr...

17.April 2003 - Neues aus der Forschung

Kautschuke

Mould Fouling of EPDM Rubber Compounds

Mould fouling of EPDM rubber compounds has been studied by means of Fourier IR spectroscopy, X-ray diffractometry, differential scanning calorimetry and other methods. Chemically altered constituents of the plasticizer oil – resinous substances formed by reaction with the curing system during heating in contact with the metal surface of the mould – are the source […] mehr...

17.April 2003 - Neues aus der Forschung

Kautschuke

CO-Vulcanization of Acrylonitrile-Butadiene Rubber and Ethylene-Propylene-Diene Rubber Blends

In the present study, attempts have been made to covulcanize acrylonitrile-butadiene rubber (NBR) and ethylene-propylene diene (monomer) rubber (EPDM) blend in presence of a multifunctional rubber additive, namely, bis(diisopropyl) thiophosphoryl disulfide (DIPDIS). It is noticed that DIPDIS is very much effective in producing filled blend vulcanizates of techno-commercial importance, especially by two-stage vulcanization (TSV), which […] mehr...

19.März 2003 - Neues aus der Forschung

Kautschuke

Studies on Flammability, Thermal Stability and Hot Oil Resistance of Silicone Rubber, Fluororubber and Their Blends

The paper reports the results of Limiting oxygen index (LOI) measurements, thermogravimetric (TG) analysis and hot oil resistance (ASTM #1 and IRM 903 oils both at 150 8C) of silicone rubber, fluororubber based on tetrafluoroethylene/propylene/ vinylidene fluoride terpolymer and their blends. Fluorosilicone rubber is included in the studies as a control. The results of LOI […] mehr...

19.März 2003 - Neues aus der Forschung

Elastomere für den Trinkwasserkontakt

Schlechte Aussichten für Biofilme

Für die Freigabe von Elastomermischungen für Trinkwasseranwendungen darf die Keimzahl des Prüfwassers durch den Kontakt mit dem Prüfkörper in noch festzulegenden Grenzen nicht beeinflusst werden. Neue EPDM-Mischungen von Kraiburg verfügen über mikrobiologische Freigaben nach dem DVGW Arbeitsblatt W 270 und nach KTW für den Kalt- und den Heißwassereinsatz. mehr...

14.Februar 2003 - Fachartikel

Kautschuke

Effect of Branching on the Rheological Properties of Butyl Elastomer

Butyl elastomers with different degree of branching and molecular weight were prepared in laboratory batch polymerization experiments. Samples prepared ranged from high gel content to linear. Branching was achieved by the addition of divinyl benzene. Molecular weight was controlled by the addition of a strong chain transfer agent, 2,4,4-trimethyl-penetene-1 (TMP-1). In butyl Polymerization, the transfer […] mehr...

14.Februar 2003 - Neues aus der Forschung

Kautschuke

Influence of Additives Incorporation Sequence on NR/BR Blend Properties

NR/BR blends (50/50) were prepared by using four different sequences to incorporate the additives. After curing under constant conditions the vulcanizates demonstrate sequence-dependent mechanical properties. Based on dynamic mechanical thermal analysis and scanning electron microscopy a correlation between the mechanical performance and the blend morphology can be established. The effects are caused by the selective […] mehr...

14.Februar 2003 - Neues aus der Forschung

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