Deciphering Siloxane Bond Exchanges: From a Molecular Study to Vitrimerization and Recycling of Silicone Elastomers.

The activity of various additives promoting siloxane equilibration reactions is examined and quantified on model compounds. We found in particular that the "superbase" phosphazene derivative P - Bu can promote very fast exchanges (a few seconds at 90 °C) even at low concentration (<0.1 wt %).

Percolation as a single test to assess pollution potential of a waste.

A new test of percolation under pressure is proposed to estimate the pollution potential of wastes in various scenarios. Depending on the use foreseen for the material, samples can be analysed in a granular or monolithic state. The proposed trial keeps the physical structure of the samples and accelerates the phenomena by applying a pressure variation in order to obtain many important data, such as permeability and the environmental release of species.

Cutaneous sarcoidosis occurring during anti-TNF-alpha treatment: report of two cases.

We report two cases of cutaneous granuloma induced by anti-TNF-alpha therapy: a 47-year-old man suffering from psoriatic arthritis treated with infliximab and a 56-year-old woman treated with adalimumab for polyarticular juvenile rheumatoid arthritis. The biospies confirmed the diagnosis of a 'sarcoidosis-like' reaction. No systemic involvement was observed.

n-channel polymers by design: optimizing the interplay of solubilizing substituents, crystal packing, and field-effect transistor characteristics in polymeric bithiophene-imide semiconductors.

Electron transporting (n-channel) polymer semiconductors for field-effect transistors are rare. In this investigation, the synthesis and characterization of new electron-depleted N-alkyl-2,2'-bithiophene-3,3'-dicarboximide-based pi-conjugated homopolymers and copolymers containing the 2,2'-bithiophene unit are reported. A novel design approach is employed using computational modeling to identify favorable monomer properties such as core planarity, solubilizing substituent tailorability, and appropriate electron affinity with gratifying results.