Direct production of ultra-high molecular weight polyethylene with oriented crystalline microstructures

Titanocene (Cp2TiCl2) was immobilized by entrapping within a silica matrix using a non-hydrolytic sol–gel route. The catalyst was evaluated in ethylene polymerization under different experimental conditions. The catalyst was able to produce fibers of ultra-high molecular weight (UHMWPE) directly from the polymerization process. The polymer showed a well-organized and dense microstructure with evidence of extended-chain crystal formation. This resulting microstructure improved some mechanical properties in comparison with a commercial UHMWPE.

Graphical abstractCp2TiCl2 was immobilized by entrapping within a silica matrix using a non-hydrolytic sol–gel route. The catalyst was evaluated in ethylene polymerization under different experimental conditions. The catalyst was able to produce fibers of ultra-high molecular weight (UHMWPE) directly from the polymerization process. The polymer showed a well-organized and dense microstructure with evidence of extended-chain crystal formation. This resulting microstructure improved some mechanical properties in comparison with a commercial UHMWPE.Figure optionsDownload full-size imageDownload high-quality image (153 K)Download as PowerPoint slideHighlights► Supported metallocene by non-hydrolytic sol–gel process. ► Fibers of ultra-high molecular weight polyethylene. ► Well-organized and dense microstructure. ► Extended-chain crystal formation.