Electric-field assisted free-radical polymerization allows controlling the stereochemistry of produced polymers.

Polymers are unique among engineering materials since they are the only common technological material in which the amorphous state can be the minimum energy state. This is a consequence of topology. Molecular topology is a description of molecules which includes their stereo-chemical arrangement, branching, formation of helices and network/looping/entanglement characteristics. Consider two chai...

Binucleating multidentate amine bis(phenolate) ligands with rigid terphenyl backbones were designed to support two zirconium centers locked in close proximity. Polymerizations of propylene or 1-hexene with the synthesized bimetallic precatalysts resulted in polymers with significantly higher isotacticity (up to 79% mmmm) in comparison to the stereoirregular polymers produced with previously rep...

Chain-growth and step-growth polymerizations are the two main mechanisms that classically used to synthesize polymers. In this article, a third approach is usually not listed in polymer textbooks described, namely multistep growth “polymerization.” This synthetic strategy does proceed one pot as aforementioned ones but relies on series of distinct chemical reactions. It includes different types...

This work investigated the structural and chemical changes of plastics undergoing accelerated ageing upon irradiation that simulated ultraviolet component solar radiation for a five-year period. The selected were polyethylene (PE) polypropylene (PP) microplastic debris sampled from sandy beach as well pure pellets fragments objects made same polymers. We recorded Fourier Transform Infrared (FTI...