DEHYDROCHLORINATED ADDUCT OF BETA-CYCLODEXTRIN AND POLY(VINYLIDENE CHLORIDE)

In the fractionation of the dehydrochlorinated product of polymerization of β-cyclodextrin (β-CD) and vinylidene chloride (β-CDDH PVDC) by ultrafiltration, high molecular weight products (MW 37,000) and oligomeric ones (MW 2900) were separated. The high molecular weight compounds contain about 27 weight % of β-CD, which corresponds to nine β-CD molecules per DH PVDC chain. The β-CD content in the oligomeric products is about 40 weight %, so about 1 β-CD molecule is bonded to 1 oligomer chain. The monocrystal fraction containing 95% β-CD has been obtained additionally by precipitation fractionation. By means of gel chromatography it was established that the precipitation fractionation of β-CD'DH PVDC is accompanied by dissociation leading to free β-CD separation. The total product separates 28 weight %, while the monocrystal fraction 83 weight % of β-CD. The dissociation indicates the nonchemical character of β-CD-DH PVDC. On the basis of 13C-NMR spectra, the nonchemical bonding of β-CD to the polymer [β-CD-P/VDC + AC] for at least half the cyclic molecules has been established. The convergence of chemical shift values in the 13C-NMR spectra of some products investigated and that of model β-CD, as. © 1979, Taylor & Francis Group, LLC. All rights reserved.