Microenvironment modulation of Zr sites in covalent organic frameworks for low-pressure preparation of UHMWPE

Zr-TtDa catalyst with a triazine ring in ethylene polymerization forms hydrogen bonds with ethylene, enriching it around metal sites. This method produced high molecular weight linear polyethylene ( M w = 1.71 × 10 6 g mol −1 ) at a low pressure (5 bar).