Thiophene C−H Activation as a Chain-Transfer Mechanism in Ethylene Polymerization: Catalytic Formation of Thienyl-Capped Polyethylene†

End-capped Oligomers of Ethylene, Olefins and Dienes, by means of Coordinative Chain Transfer Polymerization using Rare Earth Catalysts

Submicron polyethylene particles from catalytic emulsion polymerization.

Particles of linear polyethylene (M(n) = (2-3) x 10(3) g x mol(-)(1); M(w)/M(n) = 2-4) obtained by catalytic emulsion polymerization of ethylene possess a nonspherical, lentil-like shape with an average aspect ratio of ca. 10 and diameters from 30 to >300 nm, as determined by TEM and AFM. The particle structure results from a stacking of the lamellae along the one shorter axis of the lentils (i...

Methane activation and catalytic ethylene formation on free Au(2) (+).

Single Lamella Crystals of Polyethylene Accessible by Catalytic Emulsion-Polymerization

INTRODUCTION Since many decades, polyethylene (PE) is one of the commodity polymers which has become ubiquitous because of its low price and good mechanical properties. Hence, the number of applications of the material is huge and many millions of tons are produced worldwide annually. However, PE has hardly played any role in the emerging field of nanotechnology so far. This is due to the probl...

Silica/Polyethylene Nanocomposite Particles from Catalytic Emulsion Polymerization

Catalytic emulsion polymerization of ethylene with nickel catalysts in the presence of silica nanoparticles affords stable dispersions of silica/polyethylene nanocomposite particles. The modification of the surface of silica particles by grafting upon their surface of octenylor octylsilanes is a prerequisite for obtaining composites. Different morphologies of composites particles were observed ...