Over the 140-day period, the molar mass of the sol phase increases by about 15% which is lower than the 22% increase in average m/z ratio for a 30 wt% formulation of the same MAO over 21 days (Figure ). This is to be expected given the difference in concentrations. A comparison of the ESI-MS and PGSE NMR data is shown in Figure where the dashed lines correspond to growth curves fit to the experimental data.