http://www.cnr.it/ontology/cnr/individuo/prodotto/ID54588
Syndiospecific oligomerization and polymerization of norbornene with titanium catalysts (Articolo in rivista)
- Type
- Label
- Syndiospecific oligomerization and polymerization of norbornene with titanium catalysts (Articolo in rivista) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/j.polymer.2011.10.029 (literal)
- Alternative label
Ricci, G.; Leone, G.; Rapallo, A.; Biagini, A.; Guglielmetti G.; Porri L. (2011)
Syndiospecific oligomerization and polymerization of norbornene with titanium catalysts
in Polymer (Guildford); ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON (Regno Unito)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Ricci, G.; Leone, G.; Rapallo, A.; Biagini, A.; Guglielmetti G.; Porri L. (literal)
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- CNR-ISMAC Istituto per lo Studio delle Macromolecole;
EniChem;
Politecnico di Milano. (literal)
- Titolo
- Syndiospecific oligomerization and polymerization of norbornene with titanium catalysts (literal)
- Abstract
- Norbornene (NB) has been polymerized with TiCl4AlR2Cl (R = Et, Me, iBu) at various NB/TiCl4 molar ratio. The products obtained at low ratio (from ca. 5 to 12, depending on the mode of catalyst preparation) are a mixture of oligomers, from which it has been possible to isolate a crystalline heptamer having a 2,3-exo-disyndiotactic structure by single crystal X-ray analysis. The products obtained at higher NB/TiCl4 ratio have a higher molecular weight (up to ca. 5000 for the soluble products) and consist of amorphous and crystalline polymers. The crystalline polymers, characterized by X-ray and 13C NMR, are a new type of stereoregular polynorbornene (PNB), having a 2,3-exo-disyndiotactic structure. Mechanistic aspects are examined and a precise assignment of some resonances in the 13C NMR spectrum of vinyl-type PNBs is reported. (literal)
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