beta-cyclodextrin regulated stereoregularity and molecular weight in inclusion polymerization of acrylonitrile

Polyacrylonitrile (PAN) polymers were prepared by inclusion polymerization of the monomer using various molar equivalents of beta-cyclodextrin (beta-C D). Stereoregular (isotactic, atactic and syndiotactic) distributions of th e prepared PAN polymers were determined from terminal model Bernoullian sta tistics using C-13-NMR data. With an increase in acrylonitrile (AN): beta-C D ratios, the proportion of isotactic polymers increased. Also, T-g increas ed along with degradation temperature at higher AN: beta-CD ratios. However , molecular weight of the polymers prepared was lower at an AN: beta-CD rat io of 10:1, but was found to be larger than the control at an AN: beta-CD r atio of 20:1.