Stereochemistry of the radical polymerization of vinyl pentafluorobenzoate

Weihong Liu, Yasuhiro Koike, Yoshi Okamoto

研究成果: Article査読

19 被引用数 (Scopus)

抄録

The free-radical polymerization of vinyl pentafluorobenzoate (VPBz) was carried out under various conditions in order to compare its stereochemistry to that of the vinyl benzoate (VBz) polymerization using similar conditions. Contrary to the stereochemistry of the radical polymerization of VBz, VPBz favors syndiotactic propagation. The poly(VPBz) obtained in hexafluoroisopropanol (HFIP) with nBu3B-air at -30°C has a triad syndiotacticity (rr) of 52% which achieved the highest syndiotacticity reported for the radical polymerization of vinyl esters. The stereochemistry difference for the VPBz polymerization was ascribed to the electron-withdrawing effect of the fluorine on the aromatic ring. The solvent effect of enhancing the rr specificity in HFIP may be related to the hydrogen-bonding between HFIP and VPBz or the growing species. It was also found that the glass transition temperatures (Tg) of the VPBz polymers apparently increased with an increase in their diad syndiotacticities (r): the Tg of poly(VPBz) with r=72% was 79°C, which was 25°C higher than that of poly(VPBz) with r=56% obtained in toluene.

本文言語English
ページ(範囲)5491-5495
ページ数5
ジャーナルPolymer
45
16
DOI
出版ステータスPublished - 2004 7月 21

ASJC Scopus subject areas

  • 有機化学
  • ポリマーおよびプラスチック
  • 材料化学

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