γ‐Radiation Induced Functional Modification of Silica and Radiation Vulcanization of SBR‐Silica Composites

Abstract

Summary: The g-ray induced ''grafting'' of polybutadiene olygomers onto precipitated silica and the radiation induced crosslinking of the blends prepared with the modified silica in SBR matrices have been investigated in the dose range up to 290 kGy. Enhanced mechanical properties have been detected for the SBR blends containing the modified silica after g-ray induced crosslinking. The comparison with the analogue mixtures containing pristine silica, supported by EPR measurements, suggests that the PB coating is effective in enhancing the mechanism of formation of filler-rubber chemical links.

Influence of the Nature of Self-Assembled Monolayers on Their Reactivity under Ionizing Radiation: A Solid-State NMR Study

“…A global decrease of 24% of the 13 C signal is observed. As in the preceding case, no additional 13 C species could be observed. Interestingly, the global decrease of the 13 C is very similar in the Phen and Cyano samples, whereas the decrease of the proton signals is clearly enhanced for Cyano.…”

“…13 C MAS NMR. 13 C MAS NMR spectra are shown in Figure 4 in the Supporting Information. A global decrease of 21% of the 13 C signal is observed after irradiation.…”

“…Solid-State NMR Measurements. 1 H, 13 C (see the Supporting Information), and 29 Si experiments were performed at room temperature on a Bruker Avance 300 WB spectrometer operating at a Larmor frequency of 299.5 MHz for 1 H, 75.31 MHz for 13 C, and 59.59 MHz for 29 Si, using a 4 mm Bruker cross-polarization (CP) magic-angle spinning (MAS) probe with a spinning frequency of 12.5 kHz. Powdered samples of about 50 mg were quickly introduced in 4 mm o.d.…”

A comparison between the effects of gamma radiation and sulfur cure system on the microstructure and crosslink network of (styrene butadiene rubber/ethylene propylene diene monomer) blends in presence of nanoclay

“…This means that the radical-radical interaction is improved in presence of the OC and thereby an increase in crosslinks formation is obtained. Dondi et al (2011Dondi et al ( , 2012 attributed this behavior to the catalytic effect of the clay layers which results in an enhancement of the crosslinking yield. In fact the gamma radiation creates unstable intermediates in the OC, which act as initiators.…”

“…It may be due to improvement of radical-radical interaction and formation of physical crosslinks (Chaudhari et al, 2012;Sharif et al, 2005). It may also be due to the catalytic effect of the clay layers, which it enhances the formation of crosslinks in the blends (Dondi et al, 2011(Dondi et al, , 2012.…”