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Modification of silicone sealant to improve gamma radiation resistance, by addition of protective agents.

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Title: Modification of silicone sealant to improve gamma radiation resistance, by addition of protective agents.
Authors: González-Pérez, Giovanni1, Burillo, Guillermina1 burillo@nucleares.unam.mx
Source: Radiation Physics & Chemistry. Sep2013, Vol. 90, p98-103. 6p.
Subjects: Silicones, Sealing compounds, Barrier creams, Polydimethylsiloxane, Gamma rays, Naphthalene
Abstract: Abstract: Poly (dimethylsiloxane) (PDMS) sealant (SS) was modified with the addition of different protective compounds to conserve its physical-chemical properties during gamma irradiation. 2-Vinyl naphthalene (2-VN), bisphenol-A (BPA) and poly (vinyl carbazole) (PVK) were used to evaluate radiation protection through the crosslinking effect of radiation. The samples were irradiated with doses from 100kGy to 500kGy at room temperature in air, with a 60Co gamma source, and the changes in molecular weight, thermal behavior, elastic properties and infrared spectra (FTIR-ATR) absorbance analysis were determined. The molecular weight of unmodified silicone sealant increases with the absorbed dose because of crosslinking as predominant effect. However, the crosslinking effect was inhibited with the addition of protective agent due to the aromatic compounds present. Modified silicone sealant films present better radiation resistance than unmodified system. [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:Abstract: Poly (dimethylsiloxane) (PDMS) sealant (SS) was modified with the addition of different protective compounds to conserve its physical-chemical properties during gamma irradiation. 2-Vinyl naphthalene (2-VN), bisphenol-A (BPA) and poly (vinyl carbazole) (PVK) were used to evaluate radiation protection through the crosslinking effect of radiation. The samples were irradiated with doses from 100kGy to 500kGy at room temperature in air, with a 60Co gamma source, and the changes in molecular weight, thermal behavior, elastic properties and infrared spectra (FTIR-ATR) absorbance analysis were determined. The molecular weight of unmodified silicone sealant increases with the absorbed dose because of crosslinking as predominant effect. However, the crosslinking effect was inhibited with the addition of protective agent due to the aromatic compounds present. Modified silicone sealant films present better radiation resistance than unmodified system. [Copyright &y& Elsevier]
ISSN:0969806X
DOI:10.1016/j.radphyschem.2013.03.014