Effect of gamma-radiation on thermal ageing of butyl rubber compounds
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2018
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BRAZILIAN CONFERENCE ON COMPOSITE MATERIALS, 4th
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Butyl rubber has a comprehensive use in sealing systems, especially in tires inner tubes, due to their low permeability to gases. So, it is required that butyl rubber compounds show a better performance, more and more. Butyl rubber is provided with excellent mechanical properties and oxidation resistance. Besides showing these properties, radiation exposures impart modifications in physical-chemical and morphological properties on butyl rubber materials. When exposed to gamma-radiation, rubbers suffer changes in their mechanical and physical properties, caused by material degradation. The major radiation effect in butyl rubbers is chain- scission; besides, ageing promotes too the same effect with further build-up of free radicals. This work aims to the study of gamma-radiation in physical-chemical properties of butyl rubber subjected to thermal ageing. Doses used herein were: 25 kGy, 50 kGy, 100 kGy, 150 kGy and 200 KGy. Samples were evaluated before and after ageing according to traditional essays, such as: hardness, tensile strength and elongation at break. From accomplished assessments it is possible to affirm that at doses higher than 50 kGy it was observed a sharp decreasing in butyl rubber physical-chemical properties, before and after exposure to ageing.
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SCAGLIUSI, SANDRA R.; CARDOSO, ELIZABETH C.L.; LUGAO, ADEMAR B. Effect of gamma-radiation on thermal ageing of butyl rubber compounds. In: BRAZILIAN CONFERENCE ON COMPOSITE MATERIALS, 4th, July 22-25, 2018, Rio de Janeiro, RJ. Proceedings... p. 1-6. Disponível em: http://repositorio.ipen.br/handle/123456789/29477. Acesso em: 06 Jun 2024.
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