Molecular weight distribution of a polyester

摘要

AbstractCombined solvent composition and column temperature gradients were employed to effect the efficient fractionation of a polyester into several molecular weight fractions in about 16 hr. Mixtures of methyl ethyl ketone and cyclohexane were used as eluents for the fractionation which was conducted in a copper column packed with glass beads. In previously reported polymer fractionations with solvent and temperature gradients the temperatures at all points in the column have been either above or below the melting point of the polymer. This study demonstrates that hexanediol–succinic acid polyester may be efficiently fractionated by using a column temperature range which brackets the melting point of the polyme