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Structural characterization of syndiotactic 1,2-poly(4-methyl-1,3-pentadiene)

✍ Scribed by Stefano V. Meille; Silvia Capelli; Giovanni Ricci

Publisher: John Wiley and Sons
Year: 1995
Tongue: English
Weight: 510 KB
Volume: 16
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.1995.030161203

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✦ Synopsis

Abstract

4‐Methyl‐1,3‐pentadiene was polymerized with the MAO/CpTiCl~3~ (MAO: methyl‐aluminoxane, Cp: Cyclopentadienyl) system to yield a highly stereoregular syndiotactic 1,2‐polymer. Fiber diffraction patterns indicate two crystalline modifications: a major one with a repeat of 11.73 Å and minor amounts of a zig‐zag planar polymorph (axial repeat 5.05 Å). Energy calculations account for three nearly isoenergetic conformations: the more stable one, with repeat of 11.65Å, is (T~6~G~2~T~2~G~2~) analogous to the one recently reported for syndiotactic poly(propylene) (Chatani et al., 1991).

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