キハラ ノブヒロ   Kihara Nobuhiro
  木原 伸浩
   所属   神奈川大学  理学部 化学科
   職種   教授
言語種別 英語
発行・発表の年月 1996/08
形態種別 学術雑誌
査読 査読あり
標題 Cationic Ring-Opening Polymerization of 2-Isopropenyl-4-Methylene-1,3-Dioxolane in Donative Solvents
執筆形態 共著
掲載誌名 Makromol. Chem. Phys.
巻・号・頁 197(8),pp.2455-2460
著者・共著者 Jaekyeung Park, Nobuhiro Kihara, and Takeshi Endo
概要 2-Isopropenyl-4-methylene-1,3-dioxolane undergoes cationic polymn. in donative solvents without crosslinking to afford a poly(ether ketone) having 2 unit structures. When solvents having medium donor no. (DN = 14.1-17.1), such as acetonitrile, dioxane, Et acetate, and propylene carbonate, were used, poly(ether-ketone) was obtained in high yields. When solvents having higher DN (>19.2), such as di-Et ether, DMF, and DMAc were used, the rate of polymn. decreased considerably although polymn. proceeded even in the most donative solvent, DMAc (DN = 27.8). The ratio of the unit structures was independent of the solvent used. When ethanol was used as the solvent, ethoxyacetone and methacrolein were obtained instead of polymer. Hard nucleophiles such as ethanol attack at the α'-position of terminal oxyallyl cation, while soft nucleophiles such as the monomer attack at the α- or γ-position.
DOI 10.1002/macp.1996.021970809
ISSN 1022-1352