http://www.cnr.it/ontology/cnr/individuo/prodotto/ID54076
On the mechanism of formation of isotactic and syndiotactic polydiolefins (Articolo in rivista)
- Type
- Label
- On the mechanism of formation of isotactic and syndiotactic polydiolefins (Articolo in rivista) (literal)
- Anno
- 2002-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1002/1521-3900(200202)178:1<55::AID-MASY55>3.0.CO;2-H (literal)
- Alternative label
Porri, L.; Giarrusso, A.; Ricci, G. (2002)
On the mechanism of formation of isotactic and syndiotactic polydiolefins
in Macromolecular symposia; WILEY-V C H VERLAG GMBH,, D-69451 WEINHEIM, (Germania)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Porri, L.; Giarrusso, A.; Ricci, G. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Politecnico di Milano;
CNR-ISMAC Istituto per lo Studio delle Macromolecole. (literal)
- Titolo
- On the mechanism of formation of isotactic and syndiotactic polydiolefins (literal)
- Abstract
- The mode of formation of isotactic and syndiotactic polymers from 1,3-
dienes is examined in the light of the most recent results. An
interpretation is given for the formation of trans-1,4 isotactic polymers
from CH2=CH-CH=CHR (R = Me, Et, Pr, etc.) type monomers with eterogeneous
VCl3-based systems. Evidence is reported showing that stereoregular 1,2
or cis-1,4 polymers derive from a growing polymer chain, anti-h3-bonded
to the transition metal and a cis-eta4 coordinated monomer. The influence
on stereoselectivity of the substituents at the central carbon atoms of
the monomer is discussed. The peculiar behavior of (Z)-1,3-pentadiene and
4-methyl-1,3-pentadiene, which give 1,2 polymers with catalysts that give
1,4 polymers from other monomers, is attributable to the fact that they
can coordinate trans-eta2, in addition to cis-eta4. (literal)
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- Autore CNR
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