Chain-Growth Step in Anionic Polymerization Chain-growth step in anionic polymerization COOCH COOCH COOCH, →→CH,-CH H growing chain methyl acrylate stabilized anion polymer ■ Effective anionic polymerization requires a monomer that gives a stabilized carbanion when it reacts with the anionic end of the growing chain. Chapter 26 11
Chapter 26 11 Chain-Growth Step in Anionic Polymerization ▪ Effective anionic polymerization requires a monomer that gives a stabilized carbanion when it reacts with the anionic end of the growing chain
Stereochemistry of Polymers An isotactic polymer (side groups on the same side of the backbone) A syndiotactic polymer (side groups on alternating sides of the backbone) An atactic polymer (side groups on random sides of the backbone) HRHR RHHRRHRHH Copyright 2010 Pearson Prentice Hall,Inc. Chapter 26 12
Chapter 26 12 Stereochemistry of Polymers