The free-radical photopolymerisation (FRP) suffers from inhibition by atmospheric oxygen which reacts with excited species and radicals leading to inhibition period, longer irradiation time, incomplete conversion of the coating and heterogeneity in depth conversion with a possibly tacky surface.
New research results provide innovative opportunities for high-level information coding and protection by using water-soluble graphitic carbon nitride quantum dots (g-CNQDs) as invisible security inks.
Using a new synthesis procedure, it is now possible to produce the extremely resistant material polyimide in the form of angular particles for the first time. They could be combined with other materials to produce protective coatings.
Researchers synthesised diamine-functionalised graphene oxide, DDS–GO and HMDA–GO, by introducing 4,4′-diaminodiphenyl sulfone (DDS) or hexamethylenediamine (HMDA) into the carboxylic acid groups on graphene oxide (GO) via amide bonds.