M. Minagawa et al., ISOTACTIC POLY(ACRYLONITRILE) VIA ULTRAVIOLET-IRRADIATION OF ACRYLONITRILE-UREA CANAL COMPLEX, Journal of polymer science. Part A, Polymer chemistry, 33(4), 1995, pp. 665-671
Isotactic poly(acrylonitrile) (PAN) has been prepared by means of a co
nventional ultraviolet (UV) irradiation apparatus without gamma-ray so
urces; an acrylonitrile-urea canal complex was directly formed at the
surface of the UV (Hg) emission tube at low temperatures (similar to -
78 degrees C). When the complex was UV-irradiated at this temperature,
a stereoregular polymer was formed in the canal. The C-13-NMR analyse
s indicate that (1) these PAN are rich in isotactic configuration, (2)
the extent of the isotactic triad is in the range of 56-71%, and (3)
the penultimate unit effect, 4 (mm) (rr)/(mr)(2), is linearly correlat
ed with the ultimate unit effect, (mm)/(rr). From the plots of log {4(
mm)(rr)/(mr)(2)} vs log {(mm)/(rr)}, the anomaly in the polymerization
of AN is discussed. The molecular characteristics of the UV canal PAN
such as molecular weight, etc., were briefly noted. (C) 1995 John Wil
ey & Sons, Inc.