Classifying stereoregular polymers

Symmetry and Repetition Theory in Classifying Stereoregular Polymers... 

The well known rule for classifying stereoregular polymers states that in isotactically regular polymers the substituent groups on the asymmetric carbons of the repeating units are oriented similarly either above or below... 

A variety of monomers can be trapped in the inclusion spaces at the molecular level and polymerized under suitable conditions. Such a reaction is called inclusion polymerization. " The study of inclusion polymerization started soon after the discovery of a honeycomb structure of urea inclusion compoxmds. The early study aimed to obtain highly stereoregular and asymmetric polymers in the spaces. Further studies brought about a profound understanding of the space effects from various viewpoints. Now. inclusion polymerization is classified between bulk or solution polymerization and solid state polymerization. In other words, it may be situated as low-dimensional and space-dependent polymerizations. Such a polymerization closely relates to supramolecular chemistry from a viewpoint of molecular information and expression. 

In terms of stereoregularity synthetic polymers may have trans and gauche forms, similar to some small molecules (e.g., ethane). Because of the steric position of substituents along the chain, the heterogeneity of the chain structure may be classified into three forms ... 

---