Idealized helical stereospecific polymerization

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Abstract
This paper presents a mechanism for ascribing the observed stereoregular effects of certain polymerizations to helical stereospecific polymerization. The potential energy “sink” inherent in helical addition of monomer to a growing chain is taken as the controlling factor in such polymerizations. Two combinations, ∼mdmdmd− and ∼mlmlml− out of the eight possible random combinations of three units of two isomers, are presumed to be capable of sustained helical polymerization; the rest are not and are presumed unlikely to become fertile based on the disorder inherent in an atactic chain. With this assumption of idealized helical polymerization as a basis various conclusions may be drawn concerning isotactic‐atactic ratio, molecular weights of each portion, and degree of isotacticity of “isotactic” polymer.

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