Atactic polypropylene

Japanese: アタクチックポリプロピレン - あたくちっくぽりぷろぴれん
Atactic polypropylene


[Stereoregular Polymerization]
Monomers with vinyl groups CH 2 =CH-, such as propylene, are stereochemically divided into those in which the methyl groups in the side chains are regularly arranged along the molecular chain and those in which they are not. Conventional radical polymerization only produced randomly oriented amorphous atactic polypropylene, but the use of Ziegler-Natta catalysts produces crystalline isotactic polypropylene in which the methyl groups in the side chains are always arranged in one direction. It is also possible to synthesize crystalline syndiotactic polypropylene in which the side chains are regularly and alternately oriented, but this is not currently in practical use.

*Some of the terminology that refers to "atactic polypropylene" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:


[立体規則性重合]
 プロピレンのようにビニル基CH2=CH-を有するモノマーは,重合すると,立体化学的に側鎖のメチル基が分子鎖に沿って規則正しく配列するものと,そうでないものに分かれる。従来のラジカル重合ではランダムに配向した非晶性のアタクチックポリプロピレンしか得られなかったのが,チーグラー=ナッタ触媒を用いると側鎖のメチル基がつねに一方向に配列した結晶性のアイソタクチックポリプロピレン(イソタクチックポリプロピレン)が得られるのである。なお側鎖が規則正しく交互に配向した結晶性のシンジオタクチックポリプロピレンも合成可能であるが,今日実用化されていない。…

※「アタクチックポリプロピレン」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

<<:  Adakutsu - Adakutsu

>>:  Atactic - Atactic

Recommend

Nagatoro [town] - Nagatoro

A town in Chichibu County, western Saitama Prefect...

sweet potato root-borer

...An insect of the family Polypteridae (illustra...

Perpetual motion machine

A fictitious power engine that can continue to do...

cost planning

… However, recent cost management focuses not onl...

beitel

…a cutting tool (diagram) used in machining metal...

Miekou - Miekou

(Also "Mieigu") [noun] ① In the Shingon ...

Kürten, P. (English spelling) KurtenP

…(3) Sadistic pleasure killing. Seeing the agony ...

Acute disseminated encephalomyelitis

Concept Acute disseminated encephalomyelitis is an...

Tao Zong-yi; T`ao Tsung-i

A Chinese scholar in the late Yuan and early Ming ...

Carax - Carax

…an ancient kingdom located at the mouth of the T...

Ankle - Ankle

〘noun〙 The bony protrusions on either side of the ...

Rheumatism

What kind of disease is it? <Immune dysfunctio...

taille personnelle (English spelling)

…Persons holding public office were also exempt. ...

Pope - Alexander Pope

English poet. Born in London as the only son of a...

Storehouse construction - Dozo-zukuri

This refers to a construction style in which the ...