Tacticity - Wikipedia
网页Tacticity (from Greek: τακτικός, romanized: taktikos, "relating to arrangement or order") is the relative stereochemistry of adjacent chiral centers within a macromolecule. [1] . The practical significance of tacticity rests on the effects on …
Isotactic Polymer - an overview | ScienceDirect Topics
网页An isotactic polymer that contains two chiral or prochiral atoms with defined stereochemistry in the main chain of the configurational base unit. From: Comprehensive Polymer Science and Supplements, 1989
立构规整性 - 维基百科，自由的百科全书
网页如果相接的两个二分体都是内消旋的，则其称为等规立构（isotactic）； 如果相接的两个二分体都是外消旋的，则其称为间规立构（syndiotactic）； 如果相接的两个二分体一个是内消旋的另一个是外消旋的，则其称为异规立构（heterotactic）。
等规立构 - 百度百科
网页等规立构（Isotactic），又叫全同立构，聚丙烯叔碳原子具有手性特征，将聚丙烯主链拉直成锯齿形，排在同一平面上或者相邻手性中心的构型相同，则形成等规立构。. 等规立构（Isotactic），又叫全同立构，聚丙烯叔碳原子具有手性特征，将聚丙烯主链拉直成 ...
29.5: Correlation of Polymer Properties with Structure
网页Isotactic polypropene is a hard, clear, strong crystalline polymer that melts at \(175^\text{o}\). It is practically insoluble in all organic solvents at room temperature, but will dissolve to the extent of a few percent in hot 1,1,2,2-tetrachloroethane.
Isotactic polymer | chemistry | Britannica
网页Isotactic and syndiotactic polymers are referred to as stereoregular—that is, polymers having an ordered arrangement of pendant groups along the chain. A polymer with a random orientation of groups is said to be atactic. Stereoregular polymers are usually high-strength materials because the uniform structure leads….
Isotactic - Vocab, Definition, and Must Know Facts - Fiveable
网页Definition. In the context of synthetic polymers, isotactic refers to a polymer configuration where all substituents (like methyl groups) are positioned on the same side of the polymer chain. This arrangement results from a stereospecific polymerization process, leading to materials with distinct physical properties.
A first principles investigation of isotactic polypropylene
网页2010年1月1日 · This study focuses primarily on isotactic polypropylene (iPP), which occurs in three different bulk polymorphs depending on how the isotactic chains are packed: monoclinic α, hexagonal β, and triclinic γ.
ISOTACTIC POLYMERS - ScienceDirect
网页This chapter focuses on isotactic polymers whose structure can be determined by studying interferences with electrons and X-rays. The main chain of crystalline polymers is formed by sequences, each consisting of 4 carbon atoms, contained in a plane with a transenchainment. The bonds linking the terminal carbon atoms of each group to the ...
31.2: Stereochemistry of Polymerization- Ziegler-Natta Catalysts
网页6 天之前 · A polymer with all methyl groups on the same side of the zigzag backbone is called isotactic, one in which the methyl groups alternate regularly on opposite sides of the backbone is called syndiotactic, and one with its …