Testing

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Fig. 4: Plausible crosslinking junctions for the vulcanized natural rubber.

Activation Energy of the Prevulcanization

Mechanism of Prevulcanization of Natural Rubber through Latex-State NMR Spectroscopy

Mechanism of prevulcanization of natural rubber (NR) was investigated by latex-state NMR spectroscopy. more...

February 18. 2019 - Research news

Bild 1: Vernetzungsisotherme und Innendruckverlauf der Moosgummimischung in  Abhängigkeit von der Temperatur.

Analysing the cell Structures and the mechanical short and long term properties of rubber Profiles

Influence of Vulcanization Parameters on the Structure and mechanical Properties of expanded EPDM

In the quality control of foamed rubber profiles, mechanical long-term tests are required to determine the degree of cross-linking. The long test duration results in a production risk for the manufacturer. more...

December 4. 2018 - Research news

Fig. 4b: Expected response influenced by superposition of stress recovery and continued relaxation.

Investigation of SBR filled with Carbon Black

Characteristics of Relaxation and recovery Behavior of filled Rubber

This paper presents new experimental approaches for investigating relaxation and recovery behaviour in steady-state dynamic tests on rubber filled with carbon black, illustrated here using SBR double shear test pieces. more...

October 9. 2018 - Research news

Table 1: Triboelectric series of the tested polymers.

Electrostatic Charge

Triboelectrification of Latex and Polyethylene Gloves

The aim of the study is to determine the electrostatic charge generated from the dry sliding of the latex (NBR) and polyethylene (PE) single and double gloves against polyamide, polypropylene and polytetrafluoroethylene. more...

September 12. 2018 - Research news

Fig. 1: Different modes of tensile deformation (loading direction in y-axis): (A) Simple elongation with volume consistency and (B) pure elongation with dilatation.

Elongation

The Effect of Boundary Conditions on the Failure Behavior of Rubber Vulcanizates under Tensile Deformation

In this study tensile deformation under pure elongation of unfilled and carbon black filled SBR vulcanizates has been investigated experimentally. more...

September 12. 2018 - Research news

Fig. 2: Water drop on a steel surface with the apparent contact angle θ. The letters S, L and V indicate the phases of the solid, the liquid and the gas phase.

Surface-Caracterization

Review – Characterization of modified Elastomer Surfaces by wetting

This article features the current state of research with respect to plasma and varnished elastomer composites, which have been characterized by the sessile drop and the modified Wilhelmy balance technique. more...

September 12. 2018 - Research news

Fig. 6: Mooney-Rivlin material calibration.

Analyzing Stress States

Efficient Material Parameter Calibration of Elastomer Specimen in uniaxial Tension, planar Shear and equibiaxial Tension

For analyzing arbitrary static 3D stress states in solid rubber compounds, three different material tests are performed. more...

July 26. 2018 - Research news

Fig. 2: Schematic image for distinguishing physical and chemical  relaxation.

Aging of EPDM

The analysis of Aging Processes of EPDM Elastomers using low field NMR with Inverse Laplace Transform and Stress Relaxation Measurements

With regard to the long-term stability of seals, “stress-relaxation” testing is known to deliver important information. more...

July 26. 2018 - Research news

Fig. 1: Experimental setup of high-pressure capillary rheometer test. Source: Institut für Kunststoffverarbeitung RWTH Aachen

Rheometric analyses are performed with a high-pressure capillary rheometer

Investigation of Wall Slippage in Silicone Rubber Compound by means of High-pressure Capillary Rheometer

Compared to organic rubber, silicone rubbers have a lower viscosity and a stronger structural viscosity. more...

June 26. 2018 - Research news

Fig. 8: Temperature distribution of the NR20-sample during biaxial harmonic loading  with a strain amplitude of 60 % at 1 Hz at minimal and maximal strain of the 250th  loading cycle (left and middle) and curves of dissipative heating over time at different strains (right). Source: Leibniz-Institut Polymerforschung, Dresden

A new Biaxial Tester

Biaxial testing System for high static and dynamic Loading of Elastomers and its Applications

For the investigation of elastomers under near-realistic loading, a new Biaxial Tester was designed and tested. more...

June 21. 2018 - Research news

Fig. 3: Plots of ∆α/αt versus α for NR compounds (SEV system). Source: R. H. Schuster EVE Rubber Research Institute 43, Zhengzhou Road 266045 Qingdao, Shandong

The effect of one stage isothermal and two-stage non-isothermal cure on crosslink density, crosslink structure

Investigations on isothermal and two-stage non-isothermal cure of unfilled NR, Nd-IR and S-SBR Compounds

The effect of one stage isothermal and two-stage non-isothermal cure on crosslink density, crosslink structure and stress-strain behavior of unfilled NR, Nd-IR and S-SBR compounds has been investigated. more...

June 20. 2018 - Research news

Fig. 3: Schematic view of a void volume measurement system including filler sample. Source: Anke Blume, University of Twente

Abrasion resistance of silica filled passenger car tire tread compounds

Void Volume Measurement – an alternative Approach to Determine the Initial Structure of Silica

To improve the abrasion resistance of silica filled passenger car tire tread compounds a good dispersion and distribution of the silica in the rubber matrix is required. From the literature it is known that the structure of fillers affects the dispersion process. more...

June 19. 2018 - Research news

Mit dem Smart  Connect 4.U hat der Fridinger Elastomerspezialist ein Produktpaket an Systemen zur Steuerung und Überwachung der Produktionsabläufe im Programm. Bildquelle Desma

Advantages of automated Elastomer Processings

Advantages of automated Elastomer Processings

At the annual highlight of the elastomer industry, Desma will demonstrate the performance of its technology by showcasing two machines from the S3 machine series. The smooth interaction of injection unit, peripheral equipment, robots and human is in the company’s focus at this trade fair. The company of Fridingen equips two machines from the S3 series with a whole range of newly developed technologies and makes them tangible in Nuremberg. more...

June 11. 2018 - Tires in

In der Bremsschlauchfertigung bei Contitech in Korbach wird Röntgenmesstechnologie für die inline Qualitätskontrolle eingesetzt. Bildquelle: Sikora

Röntgenmesstechnik für die Endkontrolle vor der Vulkanisierung

X-ray measuring systems for in-line quality control of brake hoses

Contitech Schlauch gehört zum Technologieunternehmen Continental und ist Spezialist für die Herstellung von Automobil- und Industrieschläuchen. Seit 2006 setzt das in Korbach ansässige Unternehmen in seinen Anlagen Sikora Röntgenmesssysteme zur Qualitätskontrolle während der Extrusion von Bremsschläuchen ein. Die Zusammenarbeit beider Unternehmen gründete auf einer zukunftsweisenden Lösung zur automatisierten Qualitätskontrolle im inline Prozess. more...

April 23. 2018 - Tires in

Seichi Kawahara_

LEDPNR/PLA Blend

Crystallization Behavior and mechanical Property of epoxidized natural Rubber/Poly (lactic acid) Blend

Liquid deproteinized natural rubber with an epoxy group (LEDPNR) / Poly(lactic acid) (PLA) blend was prepared by mixing and subsequent annealing at 200°C for 20 min. more...

April 16. 2018 - Research news

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