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Volume 8
International Journal of Waste Resources
ISSN: 2252-5211
Recycling Expo 2018
June 25-26, 2018
June 25-26, 2018 | Berlin, Germany
8
th
World Congress and Expo on Recycling
Butyl rubber recycling by means of gamma radiation followed by mechanical shear
Sandra R Scagliusi, Elizabeth C L Cardoso
and
Ademar B Lugão
Institute for Energy and Nuclear Research, Brazil
P
olymeric materials (plastics and rubbers) cover a continuously raising proportion of urban and industrial solid wastes
discarded in landfills and consequently their impact on environment are more and more concern. Rubbers exhibit
a very slow natural decomposition due to their chemical structure weather resistant as well to enzymatic degradation and
to microorganisms. Rubber recovering is hampered by its insolubility caused by crosslinked structures. Besides, this
tridimensional structure causes various problems for material recovering and reprocessing. Just 8% to 12% of polymeric
residues are thermoplastic polymers; remaining are elastomers especially post consumption tires. It is relevant to emphasize
that the crosslinking is essential for practical use of rubber and this process is worldwide known as vulcanizing process,
discovered by North American Charles Goodyear. The implementation of new technologies in order to reduce polymeric
residues, acceptable from the environmental viewpoint and at an effective cost proved to be a great problem due to inherent
complexities for polymers reuse. Ionizing radiation has capacity to change structure and properties of polymeric materials.
Butyl rubbers have been used in wide scale within a variety of applications such as tires spare-parts and diverse artifacts. Major
effect of high energy photon, such as gamma rays in butyl and halo-butyl rubbers is the creation of free radicals accompanied by
changes in mechanical properties. This work aims to the development of processes of controlled degradation (de-vulcanizing)
of butyl rubber in order to characterize their availability for modification and changes of their properties. Experimental results
obtained showed that butyl rubbers irradiated at 25 kGy and further sheared can be used as the starting point for mixtures
with pristine rubber.
Figure 1:
Radiation interaction products with atoms or molecules
Recent Publications
1. Scagliusi S R, Cardoso E C L and Lugão A B (2016) Study of recycling feasibility of bromobutyl rubber to gamma
radiation. Journal of Materials Sciences and Applications 2:1-9.
2. Zaharescu T, Zen H A, Marinescu M, Scagliusi S R, Cardoso E C L and Lugão A B (2016) Prevention of degradation of
γ-irradiated EPDM using phenolic antioxidants. Chemical Papers 70(4):495–504.
3. Scagliusi S R, Cardoso E C L, Parra D F, Lima L F C P and Lugão A B (2013) Evaluation of “Payne effect” in radiation-
induced modification of chlorobutyl rubber. Radiation Physics and Chemistry 84:42-46.
4. Scagliusi S R, Cardoso E C L and Lugão A B (2012) Radiation-induced degradation of butyl rubber vulcanized by three
different crosslinking systems 81(8):991-994.
Sandra R Scagliusi et al., Int J Waste Resour 2018, Volume 8
DOI: 10.4172/2252-5211-C1-011