Design and Synthesis of Sulfonated Poly(arylene ether)s

International audienc

Design and Synthesis of Sulfonated Poly(arylene ether)s

International audienc

Nitroxide mediated living radical polymerisation of styrene in emulsion

International audienc

Direct measurement of oligomers entry rate onto latex particles in an emulsion

International audienc

Synthesis of poly(pyrazolopyridine)s by Hantzsch multicomponent polymerization

International audienceThis work concerns the synthesis of poly(pyrazolopyridine)s via a three-component Hantzsch reaction. The first part of this study was intended to determine adequate experimental conditions for the synthesis of an analytically pure pyrazolopyridine heterocycle model compound in quantitative yield, which can be further used for polymer synthesis. For this purpose, the effect of different parameters (solvent, temperature, additive) on the selectivity of the reaction has been investigated. Some specific difunctional precursors (bisaminopyrazoles and dialdehydes) have been then designed and synthesized. From these reagents, poly(pyrazolopyridine)s were successfully synthesized by multicomponent polycondensation reaction. Some physico-chemical characterizations of these new macromolecular structures are described

Nanoporous laminates, organic resin composition, prepreg and laminate manufacture

Making a nanoporous substrate, such as the matrix in an elec. laminate, occurs by grafting onto an org. resin backbone a thermolabile functionality by reacting H active groups of the org. resin with a compd. contg. thermolabile groups, then thermally degrading the thermolabile groups grafted on the org. resin to form a nanoporous laminate. The nanoporous elec. laminate has a low dielec. const. (Dk) because of the nanopores present in the laminate matri

Nanoporous laminates, organic resin composition, prepreg and laminate manufacture

Making a nanoporous substrate, such as the matrix in an elec. laminate, occurs by grafting onto an org. resin backbone a thermolabile functionality by reacting H active groups of the org. resin with a compd. contg. thermolabile groups, then thermally degrading the thermolabile groups grafted on the org. resin to form a nanoporous laminate. The nanoporous elec. laminate has a low dielec. const. (Dk) because of the nanopores present in the laminate matri

Microwave-assisted synthesis of tetrasubstituted aryl imidazole based polymers via cascade polycondensation process

International audiencePoly(Tetrasubstituted Aryl Imidazole)s (PTAIs), a new class of poly(heteroaromatic) polymers was prepared via a cascade polycondensation process, under microwave irradiation. These polymers were obtained by the tetrasubstituted aryl imidazole ring formation involving bis(aryl alpha-diketone)s, bis(arylaldehyde)s, mono(arylamine)s and ammonium acetate. The polymerization performed under microwave irradiation allowed to get high molecular weight PTAIs in very short reaction times. The chemical structure of these PTAIs was confirmed by NMR spectroscopy. Thermogravimetric analyses (TGA) showed a very good grade of thermal stability of these polymers. Glass transition temperatures (T-g) of PTAIs ranging from 155 degrees C to 265 degrees C were determined by Differential Scanning Calorimetry (DSC)

Aging mechanism of sulfonated poly(aryl ether ketone) (sPAEK) in an hydroperoxide solution and in fuel cell

International audienc