The current research aims to improve the accuracy of results obtained from a pin-on-disc tribometer by using stepper motors and linear actuators. Additionally, the research focuses on enhancing the tribological properties of PMMA by reinforcing it with 0.1, 0.2 and 0.3 wt% SWCNT or MWCNT. The researchers prepared cylindrical-shaped nanocomposite samples and subjected them to friction and wear tests using a pin-on-disc tribometer with stainless steel disks as counterparts.

Rubber is used in numerous applications and due to this, different recipes are needed. For each recipe used, an individual mixing instruction has to be developed. The development of them is often based on personal knowledge. In order to generate mixing instructions in the future, the mixing process was investigated and modeled. Therefore, mixing tests were carried out using different process parameters. 

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This publication describes the design and construction of a test rig for the additive manufacturing of liquid rubber-based filled and curable low viscous rubber compounds. In contrast to the previously presented AME-process [2] [3], in which conventional high viscous rubber compounds are processed in filament form via a twin-screw extruder in a modified FFF-process, the 3D-printing process of rubber compounds in this research project is realized via a dispenser unit for low-viscosity materials.

A compound of crosslinking polyolefin elastomer (POE)/ linear low-density polyethylene (LLDPE) blend, as a class of thermoplastic elastomer family, was prepared through a two-step silane grafting method (Sioplas process) using twin-screw extruder. The silane grafted compound was used as wire and cable coatings. 

The continuous ultrasonic devulcanization of 40 mesh ground tire rubber (GTR) powder was carried out using an ultrasonically assisted twin-screw extruder. The die pressure and ultrasonic power consumption were recorded during the process. 

In a previous paper, we have presented an alternative way to use the RPA (Rubber Process Analyzer) to measure both transient and steady shear viscosity [1]. The replacement of the grooved upper die by a “mirror” polished groove less die combined with programmable internal pressure offers a unique combination to study wall slip. It unambiguously showed that the wall slip ratio is decreasing while increasing shear stress/rate. It demonstrates as well that wall slip depends upon pressure.

This study investigates the transition from linear to non-linear viscoelastic behavior in polymers and rubber compounds under cyclic sinusoidal shear deformation. The stress response is analyzed through Fourier series decomposition, enabling the definition of the generalized elastic modulus, G0 ' (γ0) and viscous modulus. These parameters are critical for characterizing the complex viscoelastic properties.

Storage hardening is an effect that commonly occurs in unvulcanized natural rubber (NR) compounds. In this study, the increase in hardness during storage of a vulcanized NR compound filled with silica was investigated. An increase in hardness during storage at room temperature and at 60 °C was observed.

Die Ozonrissbildung von Elastomeren basiert auf der chemischen Reaktion von Ozonmolekülen mit den C=C-Doppelbindungen der Polymermatrix. Die makroskopisch erkennbare Rissbildung und das Risswachstum variieren jedoch stark mit vorliegenden Umweltbedingungen. Die chemische Reaktion der Ozonrissbildung sowie der Einfluss der typischen Einstellparameter einer Ozonprüfung werden hierzu erläutert.