Functionality-Type Distribution of Poly(ethylene oxide) and Poly(propylene oxide) Macromonomers: Critical-Chromatography Study

摘要

Functionality-type distributions of macromomoners with poly(ethylene oxide) and polypropylene oxide) chains are studied by chromatography under critical conditions. It is shown that, in the critical separation mode, separation of macromolecules with respect to size disappears and only information on the functionality-type distributions of the test samples may be derived. The critical conditions are determined experimentally with a normal phase (unmodified silica gel) for poly(propylene oxide) and with a reversed phase C_(18) for poly(ethylene oxide). The experimental retention volumes for bifunctional macromolecules are in satisfactory agreement with the values calculated under approximation of the Gaussian chain model.