recycling-material-science-2019-scientifictracks

7 / 7

Page 27
Recycling 2019 & Material Science 2019
July 22-23, 2019
Volume 3 Journal of Environmental Geology
Material Science and Nanotechnology
Global Recycling Summit
July 22-23, 2019 | Rome, Italy
6th International Conference on
&
Effect of gamma-radiation on thermal ageing of butyl rubber compounds
Sandra R Scagliusi, Elizabeth C L Cardoso and Ademar B Lugão
University of Sao Paulo, Brazil
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.
Biography
Sandra Regina Scagliusi: Great experience with elastomers. Upgraded in recovering of rubbers, in general, specially dealing with
butyl and halo-butyl rubbers (chlorine and bromine). She is deeply involved with irradiation, recycling, de- vulcanization, micro-wave.
She developed a new process of rubbers recovering via radiation and mechanical shear. She has been dedicating in research toward
environmental area in recycling of solid materials and elastomers. Proved experience in research and quality control laboratories.
SandraRScagliusietal.,JEnvironGeol. |Volume3
ISSN:2591-7641