Abstract
The electromagnetic properties of chloroprene rubber after long-term ultraviolet ageing, oil immersion and thermal degradation were experimentally investigated in the frequency range from 1 kHz up to 1 THz. Ageing was shown in terms of mechanical degradation and the change in the complex dielectric permittivity. Within the whole investigated frequency range decrease of dielectric permittivity was observed after thermal treatment combined with oil immersion in comparison with chloroprene rubber stored under normal conditions. In contrast, thermal and ultraviolet ageing without immersion leads to increase of rubbers dielectric permittivity in all investigated frequency ranges. A non-invasive express method of degradation detection is proposed and proofed.
Highlights
Chloroprene rubber (CR) is one of the most important synthetic rubber resins widely used in industry
In this work we focus on the ultra-broadband experimental characterization of electromagnetic (EM) properties of neat chloroprene rubber as is and after its long-term ultraviolet ageing, oil immersion and thermal treatment
In present work the properties of five types of materials were studied: A) the neat CR, B) the CR aged under UV radiation, C) CR immersed with oil, D) CR thermally aged and E) CR thermally aged in combination with oil immersion
Summary
Chloroprene rubber (CR) is one of the most important synthetic rubber resins widely used in industry. The chemical degradation mechanism is free radical chain reaction [4] which proceeds through either chain scission or further crosslinking of the rubber molecules and to the ageing leading to loss of the original mechanical/physical properties. Most rubber resins include carbon-carbon double bonds which act as crosslinking sites during processing, some of them remain after crosslinking and are responsible for the accelerated ageing process of rubber, compared to plastics [4]. These chemical bonds are responsible for the sensitivity to ozone, oxygen and halogens, limiting the shelf life and the working life of elastomeric goods
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