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Isotactic cis-1,4-poly(3-methyl-1,3-pentadiene): a new conformation for isotactic cis-1,4-polydienes

✍ Scribed by Stefano Valdo Meille; Silvia Capelli; Giuseppe Allegra; Giovanni Ricci

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
359 KB
Volume
16
Category
Article
ISSN
1022-1336

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✦ Synopsis

Oriented specimens of isotactic cis-l,4-poly(3-methyl-l,3-pentadiene) exhibit two crystalline modifications characterized, respectively, by the expected two-fobd helical conformation with a fiber repeat of 8,02 A and by a three-fold helix with c = 9,97 A. The latter highly contracted structure is prevalent in fibers and is the only one observed in unoriented bulk specimens. Consistent with these findings conformational calculations indicate that the three-fold helix is substantially more stable than the two-fold one.

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