END-MODIFIED POLYAMIDE/PHOTOACID GENERATOR/CROSSLINKER THREE-COMPONENT-NEGATIVE-TYPE PHOTOSENSITIVE BRANCHED POLYAMIDE

Polyamide 6 Nanocomposites with Inorganic Particles Modified with Three Quaternary Ammonium Salts

The purpose of this study was to obtain polyamide 6 nanocomposites with national organically modified clay with three quaternary ammonium salts. The obtained results confirm the intercalation of molecules of salt in the clay layers, and a good interaction with the polymer, showing the formation of intercalated and/or partially exfoliated structures. The nanocomposites showed similar thermal sta...

Mean end - to - end distance of branched polymers

We use Monte Carlo methods to calculate the mean end-to-end distance of randomly branched polymer molecules. Molecular realisations are brown on the square and simple cubic lattices, and consist of N bifunctional monomers and N, polyfunctional branching units of functionality f. We treat three cases in which the monomer branches are either random walks, self-avoiding walks (saw), or SAW'S excep...

Nanofiltration Membranes Modified with Aromatic Polyamide Dendrimers Active Layers By

Umpolung synthesis of branched α-functionalized amines from imines via photocatalytic three-component reductive coupling reactions.

A three component reductive coupling reaction of a (hetero)aromatic amine, a (hetero)aromatic aldehyde and an electron deficient olefin catalysed by eosin Y under green LED light irradiation, for the direct generation of γ-amino acid derivatives, is described. This new umpolung synthesis of amines, which exploits the high nucleophilicity of a putative α-amino radical intermediate, generated via...

Three Manifolds as Geometric Branched Coverings of the Three Sphere

One method for obtaining every closed orientable 3-manifold is as a branched covering of S branched over a link. There are topological results along these lines that cannot be improved upon in two respects: (A), The minimum possible number of sheets in the covering is three; (B), There are individual knots and links (universal knots and links) that can serve as branch set for every 3-manifold, ...