“…Detailed IR spectroscopic studies of the conformational states of macromolecular chains of PVC in solutions, melts and starting powders prepared under various conditions of suspension polymerisation revealed 121,122 three stable conformational states of PVC characterised by different glass transition temperatures, melting points and supramolecular organisation. The first state has regular helical TGTGTGT conformations of the chain with an isotactic sequence as well as long planar TGTG conformations in a syndiotactic configuration and appears in the synthesis of PVC.…”