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Influence of SiO 2 fillers on the irradiation ageing of silicone rubbers

Influence of SiO 2 fillers on the irradiation ageing of silicone rubbers,10.1016/S0032-3861(01)00470-0,Polymer,I Stevenson,L David,C Gauthier,L Arambo

Influence of SiO 2 fillers on the irradiation ageing of silicone rubbers   (Citations: 14)
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Effects of irradiation on the viscoelastic properties of peroxide-crosslinked PDMS elastomers (EVC) without filler (1), filled with 30% untreated nanoscopic SiO2 (2) and with 30% surface modified silica (3) were investigated. Electron irradiation in air using a high dose rate allowing homogeneous irradiation at different doses ranging from 25 to 500kGy have led to additional crosslinking of these three types of silicone rubbers making them become more rigid and brittle. The apparent crosslink density is higher for filled elastomers since links at the polymer–silica interfaces have been created as a result of irradiation. A further crosslink density enhancement is obtained for the surface-treated silica fillers. High resolution low frequency dynamic mechanical spectroscopy shows that the magnitude of the crystallisation peak located at approximately −40°C decreases with the irradiation dose. As a result, the amplitude of the relaxation process associated with the glass transition near −125°C increases, since a larger amount of amorphous phase is present due to the hindrance of the crystallisation behaviour. DSC measurements confirm that crystallisation is limited by the formation of a higher number of crosslinks, and that this effect is amplified for filled PDMS samples. A study of mechanical hysteresis at high strains (Mullins effect) shows an increase of the associated dissipative phenomena due to the induced polymer/silica bonds.
Journal: Polymer , vol. 42, no. 22, pp. 9287-9292, 2001
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    • ...However, the formation of intermolecular cross-links upon exposure to irradiation has been established for a long time and has stimulated further studies in the vulcanization of silicones [21]...
    • ...Stevenson et al. [21] studied the irradiation ageing of silicone rubbers with and without filler using high resolution low frequency dynamic mechanical spectroscopy...
    • ...The apparent cross-linking density was higher for filled elastomers, since links at the polymer-silica interfaces have been created as a result of irradiation [21]...

    K. Stathiet al. The effect of accelerated ageing on performance properties of addition...

    • ...In recent years, polymer/nano-particle composites have attracted much attention because of theirs remarkable properties, including mechanical strength, impermeability to gases, flame retardancy, etc [1-3]...

    Zhidong Hanet al. Effects of surface modification of nano-silica on the thermal degradat...

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