Premium
Solvent‐Free Ring‐Opening Metathesis Polymerization of Norbornene over Silica‐Supported Tungsten–Oxo Perhydrocarbyl Catalysts
Author(s) -
Larabi Cherif,
Szeto Kai C.,
Bouhoute Yassine,
Charlin Marc O.,
Merle Nicolas,
Mallmann Aimery De,
Gauvin Regis M.,
Delevoye Laurent,
Taoufik Mostafa
Publication year - 2016
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201600419
Subject(s) - romp , norbornene , ring opening metathesis polymerisation , catalysis , metathesis , polymerization , polymer chemistry , monomer , polymer , tungsten , materials science , yield (engineering) , chemistry , organic chemistry , composite material
Ring opening metathesis polymerization (ROMP) of bicyclo[2.2.1]hept‐2‐ene (norbornene) is carried out over silica‐supported catalysts based on tungsten complexes bearing an oxo ligand ( 1 : [(SiO)W(O)(CH 2 SiMe 3 ) 3 , 2 : [(SiO)W(O)(CHCMe 2 Ph)(dAdPO)], dAdPO 2,6 diadamantyl‐4‐methylphenoxide, 3 : [(SiO) 2 W(O)(CH 2 SiMe 3 ) 2 ]). The evaluation of the catalytic activities of the aforementioned materials in ROMP indicates that at low reaction time (0.5 min), the highest polymer yield is obtained with catalyst 2 . However, for longer reaction time (>2 min), complex 3 , a model of the industrial catalyst, exhibits a better monomer conversion. The polymers obtained are characterized. Moreover, these catalysts are shown to be rather preferentially selective to give the cis polynorbornene (>65%), characterized by high melting points (≈300 °C). The experimental values of the average molecular weight (M n ) of polynorbornenes are found to be close to the theoretical ones for the polymers prepared using catalyst 2 and higher for those originated from catalyst 3 .