The universality of M[η] in gel permeation chromatography

Gel‐permeation chromatography of low molecular weight polymers

“…The results shown here, when combined with those of the oligomers studied by Belenkii (4), suggest that the universality of M[q] exists not only for high molecular weight polymers, but for oligomeric species as well. From an analytical point of view, it appears permissible to extend molecular weight calculations via "universal calibration" approaches (8) to lower molecular weight levels than thought previously. Universal calibration techniques involving M[q] appear to be justified for samples of broad MWD which contain oligomeric species, provided suitable MarkHouwink coefficients for the oligomers are known.…”

“…In the gel-permeation chromatography (GPC) of high molecular weight polymers, M [q] has been found by several authors to be a "universal calibration" parameter (1,2). For Gaussian coils, the mechanism governing the GPC separation involves the hydrodynamic volume, which is proportional to M [q] .…”

Analytical Successive Solutional Fractionation of Macromolecules

“…A parameter E defined by eq 6 is utilized as a measure of the accuracy of the methods for estimating the MWD of the original polymer: E= IYo(X)-ge(X)I dx ( 6) here, g0(X) is the normalized true differential MWD of the original polymer. lg0(X)-ge(X)I is the absolute magnitude of the difference between g0(X) and g 0 (X).…”

Reticulated versus crenelated surfaces on macroporous polystyrene–divinylbenzene membranes

“…The resulting copolymer is therefore heterogeneous, with the first formed polymer being more densely crosslinked then later polymerized material. 40 Because of shrinkage during polymerization, a thin gap forms between the glass plates and the polymer. This gap becomes filled with the diluent and a dilute monomer mixture, now containing but a small concentration of DVB.…”