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P. Maksimowski, W. Skupiński



Ring opening metathesis polymerization (ROMP) of cyclopentene over the WOCl4/Al203-Si02/RnXmM system

Polimery 1998, No 3, 166


DOI: dx.doi.org/10.14314/polimery.1998.166


Summary

The activity and selectivity of heterogenized catalyst WOCl4/Al2O3-SiO2/RnXmM systems (M = Al, Sn or Pb; R = alkyl; X = halogen; n = 1, 2, 3 or 4; m = 2 or 3) was studied in a model ROMP reaction of cyclopentene and found to be affected by the nature of the RnXmM compound, composition of the Al2O3-SiO2 gels, time and temperature of alkylation of tungsten topochemical (surface) complexes, and the M/W ratio. The polypentenamer yield was affected by the temperature and time of polymerization, the monomer concentration, and the cyclopentene/W ratio. The Best conditions were established for the catalyst preparation and polymerization reaction. The catalysts examined were also found to be active in the ROMP reactions of norbomene, norbomadiene and dicyclopentadiene.


Keywords: ring opening metathesis polymerization (ROMP), cyclopentene, heterogenized tungsten-based catalysts, polypentenamers, microstructure


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