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Stereochemistry of oligomers in stereospecific and conformational specific ionic polymerizations
Author(s) -
Vogl Otto,
Garner Charles,
Simonsick William J.,
Kratky Christoph,
Ute Koichi,
Hatada Koichi
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920600118
Subject(s) - tacticity , stereospecificity , polymer chemistry , polymer , ionic bonding , chemistry , methyl methacrylate , side chain , polymerization , stereochemistry , organic chemistry , catalysis , ion
Low molecular weight oligomers of methyl methacrylate (MMA) and perhaloacetaldehyde were studied as to their composition, end groups and stereochemistry. The oligomerization of methyl methacrylate can be directed toward almost pure isotactic or toward almost syndiotactic oligomers depending upon the intitiating system used. Perhaloacetaldehydes showed a stereospecificity which depended upon the size and bulkiness of the side group in the polymer chain. There is no dependence of the sterospecificity based on the initiating system and only isotactic polymers could be obtained which are not only stereospecific but also conformationally specific giving conformational specific isotactic 4/1 helices.