...That is, as shown in Figure 6, if the C-C bonds that make up the backbone of a polymer are placed on a sheet of paper, the methyl group CH3 will either be in front of or behind the sheet of paper. Normally, it is thought to take a random structure (atactic structure) like figure a, but in the mid-1950s, the discovery of the Ziegler catalyst made it possible to easily polymerize propylene and obtain a polymer with a structure (isotactic structure) in which all the methyl groups are regularly arranged on the same side, as shown in figure b. This type of polypropylene is currently used as synthetic fibers and plastics. ... *Some of the terminology explanations that mention "isotactic" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…すなわち図6に示すように,高分子の骨格をつくるC-C結合を紙面に置くと,メチル基CH3は紙面の手前に来るか後ろへ行くかのいずれかとなる。ふつうは図のaのようなランダムな構造(アタクチックatactic構造)をとると考えられるが,1950年代の半ばに,チーグラー触媒の発見により,プロピレンを容易に重合させ,図のbのようにメチル基がすべて同じ側に規則正しく並んだ構造(イソタクチックisotactic構造またはアイソタクチック構造)のポリマーを得ることができるようになった。このポリプロピレンは現在,合成繊維,プラスチックとして用いられている。… ※「isotactic」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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