Fraktionierung von Polyacetalen

Abstract

SynopsisTwo apparatus are described which allow fractionation of polyacetales showing different rnolecular weight distributions with sufficient reproducibility. Results obtained by the discontinuous and continuous elution rnethod are cornpared to those obtained by a rnodified solution fractionation rnethod, originally devised by O. Fuchs. Within experirnental error the three rnethods give the sarne rnass distribution curve. An equation is proposed by rneans of which it is possible to calculate the variation of the concentration in the rnixing vessel during a fractionation with the eluted volume. By changing certain parameters of the equation the variation of the concentration rnay be fitted to any rnolecular weight distribution.