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Infrared studies of stereoregularity of copoly(γ‐benzyl‐ D , L ‐glutamate) by the polymerization of the N‐carboxylic anhydride
Author(s) -
Akaike Toshihiro,
Inoue Shohei,
Itoh Koichi
Publication year - 1974
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1974.360130903
Subject(s) - sodium methoxide , chemistry , polymerization , polymer , polymer chemistry , butylamine , methoxide , infrared spectroscopy , selectivity , sodium , infrared , organic chemistry , catalysis , amine gas treating , physics , optics
Abstract The D and L copolymerizations of γ‐benzyl glutamate N‐carboxylic anhydride (NCA) were carried out by two different initiators, n ‐butylamine and sodium methoxide. The stereoregularity of the polymer was examined by infrared spectroscopy in the region 700–200 cm −1 . A remarkable difference was found between the polymers obtained by these initiators in the region 450–400 cm −1 . In the polymer obtained with sodium methoxide as initiator, the 409‐cm −1 peak assigned to local α‐helical conformation was not greatly affected by the amount of the L ‐form, but in the polymer obtained by n ‐butylamine this peak was much affected by the variation of L ‐content. This indicates that the stereo‐selectivity of the polymerization in the sodium methoxide initiated system is higher than that in the n ‐butylamine initiated system.