Abstract
Polyhedral oligomeric silsesquioxanes (POSSs) were adsorbed on methylaluminoxane-activated silica for the immobilization of fluorinated bis(phenoxyimine)Ti complexes (FI catalyst). These POSSs have been characterized as horizontal spacers isolating the active sites and hindering the chain overlap in polymerization. The heterogeneous catalyst exhibits considerable activity in the synthesis of weakly entangled polyethylene.
Highlights
Polyhedral oligomeric silsesquioxanes (POSSs) were adsorbed on methylaluminoxane-activated silica for the immobilization of fluorinated bis(phenoxyimine)Ti complexes (FI catalyst)
Our proposed method is that after the consumption of –OH groups, POSS exhibits no extra site for FI and its steric hindrance effect serves to (i) block nearby Al sites enlarging the distance between the immobilized FI and (ii) separate the growing polymer chains (Scheme 1)
The surface Si element is examined by XPS analysis to check POSS adsorption with typical XPS spectra given in Fig. S3 (ESI†)
Summary
Polyhedral oligomeric silsesquioxanes (POSSs) were adsorbed on methylaluminoxane-activated silica for the immobilization of fluorinated bis(phenoxyimine)Ti complexes (FI catalyst).
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