Crystallizable Polystyrene. I. Polymerization of Styrene with Alfin Catalysts¹

ÜBer die polymerisation von styrol mit n‐amylnatrium. IX. Mitt.. Über die stereospezifische polymerisation mit alkaliorganischen verbindungen

“…Der Gehalt an n-Amylnatrium wurde nach der Methode von WILLIAMS et al 13) bestimmt. Die Schlenkrohre mit der Initiatorsuspension wurden vor jeder Probenentnahme etwa 15 Min.…”

Stereospecific Vinyl Polymerization by Asymmetric Induction1

“…The belief that the stereoisomerism of high polymers has an important effect upon their physical properties has by now been verified by the extensive research of Natta's school9-12 with important contributions by Schildknecht13•14 and others. [15][16][17][18][19] In their work polymers have been synthesized with long sequences of mers having a regular distribution of configurations and greatly enhanced crystallinity. The closely related problem of preparing a polymer or copolymer with an excess of one configuration in the backbone of the polymer chain and exhibiting Optical activity has however not been solved heretofore although it was first attacked unsuccessfully about sixty years ago.…”

Anionic Synthesis of Highly Isotactic Polystyrene in Hexane in the Presence of Lithium Hydroxides

“…Introduction. Ziegler−Natta catalyzed vinyl polymerizations are known to produce stereoregular polymers such as isotactic polypropylene or isotactic polystyrene. , An early anionic type polymerization giving fractions of crystallizable polystyrene using Alfin initiators was reported by Williams et al…”