Forschung Zur Rubrik

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Formeln in schwarzer Schrift.
Optimizing the Properties of Elastomers

Role and Mechanisms of Coagents in peroxide Crosslinking

High performance elastomers based on peroxide cured EPDM have a wide range of applications. The aim of the investigations carried out using different ­EPDM-types was optimizing the elastomer properties by means of suitable combinations of peroxides and coagents and their concentration ratios, which requires a fundamental understanding of the mechanisms in the interaction of the crosslinking agents. The achievable crosslinking densities (XLD) and crosslinking efficiencies were investigated Aging studies using chemiluminescence (CL) shows, that residual peroxide (RPC) content causes a significantly lower thermal-oxidative aging resistance.

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Strichdiagramm mit Punkten-Buchstaben-Beschriftung in orange und blau.
Revisiting Rebound Resilience according to Schob

Dynamic Mechanical Analysis by Rebound Resilience – Revisiting Rebound Resilience

The rebound resilience according to Schob is a widely used test method. It delivers information about hysteretic losses in a rubber sample. Its success is not only related to the simplicity of the experiment, but also to the characteristic contact times and the type of deformation similar to those observed in tire-road contact. While the resilience value only delivers a relative value of the dissipation of the potential energy of a pendulum, the highly dynamic process of the impact contains valuable informa- tion accessible by analysis of the time derivatives of the deformation as a function of time. A new type of rebound tester according to Schob is proposed here that is able to perform a dynamic mechanical analysis of the rebound resilience within the contact time of a few milliseconds.

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