An isotactic triad (mm) is made up of two adjacent m diads, a syndiotactic triad (also spelled syndyotactic[4]) (rr) consists of two adjacent r diads, and a heterotactic triad (rm) is composed of an r diad adjacent to an m diad. The mass fraction of isotactic (mm) triads is a common quantitative measure of tacticity.

聚丙烯，是由丙烯聚合而制得的一种 热塑性树脂。 按 甲基 排列位置分为 等规聚丙烯 （isotactic polypropylene）、 无规聚丙烯 （atactic polypropylene）和 间规聚丙烯 （syndiotactic polypropylene）三种。 分子链中的甲基（-CH3）分布在主链一侧，所以称之为等规聚丙烯。 一般 工业生产 的 聚丙烯树脂 中，等规结构含量约为95%，其余为无规或间规聚丙烯。 工业产品以等规物为主要成分。 聚丙烯的一种，分子中的甲基在主链的一侧。 又称为全同立构聚丙烯。

... to the presence of a methyl group on every second carbon atom in the polymer chain of polypropene, the structure of this polymer can be described in terms of three basic forms: i.e. isotactic,...

聚合物的立体化学有一个不同的描述标准，称为 立构规正度 ( tacticity) 。 立构规整度仅描述局部的立体中心的相对构型。 等规立构 的 ( isotactic) 聚丙烯在所有的立体中心具有相同的构型；如果反应面交替，聚合物的立体中心的构型就交替，就生成了 间规立构 的 ( syndiotactic) 聚合物；随机的立体中心混合物称为 无规立构 的 (atactic) 聚合物。 无规聚丙烯是一种胶状、勃稠的糊状物，有时被用作粘结剂；而等规聚丙烯是橡皮状的塑料，被用作瓶盖材料。 下面这个催化剂是C2对称 …

A Syndiotactic Polymer is a type of polymer that exhibits a regular structure with alternating positions of side groups along the polymer chain. These polymers have high melting points and are used in manufacturing objects that require exposure …

Many other kinds of regular structures are possible and the one of these that has been prepared, although not in quantity, is the syndiotactic form, which has the methyl groups oriented alternately on one side or the other of the polymer chain.

2019年7月30日 · Initial developments in polymer stereochemistry focused on the ubiquitous class of plastics known as vinyl polymers, with some of the most notable achievements being the synthesis of isotactic (Box...

2006年2月1日 · In this review, the studies on the catalysts that promote the syndiospecific polymerization of propylene, the crystal structure, the polymorphic behavior and the physical properties of syndiotactic polypropylene, carried out since the early synthesis, are described.

Syndiotactic is a term used in polymer chemistry to describe the stereochemical configuration of a polymer chain, where the substituents (e.g., side groups) are arranged in an alternating pattern along the backbone of the polymer. This specific arrangement of the substituents gives the polymer unique physical and chemical properties.

If the substituents alternate from one side to another in a regular manner the configuration is termed syndiotactic. Finally, a random arrangement of substituent groups is referred to as atactic. Examples of these configurations are shown here.