ISOTACTIC CIS-1,4-POLY(3-METHYL-1,3-PENTADIENE) - A NEW CONFORMATION FOR ISOTACTIC CIS-1,4-POLYDIENES

Authors
MEILLE SV CAPELLI S ALLEGRA G RICCI G
Citation
Sv. Meille et al., ISOTACTIC CIS-1,4-POLY(3-METHYL-1,3-PENTADIENE) - A NEW CONFORMATION FOR ISOTACTIC CIS-1,4-POLYDIENES, Macromolecular rapid communications, 16(4), 1995, pp. 329-335
Citations number
14
Categorie Soggetti
Polymer Sciences
Journal title
Macromolecular rapid communications → ACNP
ISSN journal
10221336
Volume
16
Issue
4
Year of publication
1995
Pages
329 - 335
Database
ISI
SICI code
1022-1336(1995)16:4<329:IC-ANC>2.0.ZU;2-W
Abstract
Oriented specimens of isotactic cis-1,4-poly(3-methyl-1,3-pentadiene) exhibit two crystalline modifications characterized, respectively, by the expected two-fold helical conformation with a fiber repeat of 8,02 Angstrom and by a three-fold helix with c = 9,97 Angstrom. The latter highly contracted structure is prevalent in fibers and is the only on e observed in unoriented bulk specimens. Consistent with these finding s conformational calculations indicate that the three-fold helix is su bstantially more stable than the two-fold one.