Abstract
The gel permeation chromatography of isotactic PMMAs containing exactly one t-butyl group per chain at the chain end was performed on a chromatograph linked to a 500 MHZ 1H NMR spectrometer. The M̅n of the solute PMMA can be directly determined from the intensities of 1H NMR signals due to t-butyl and methoxy groups with a time resolution of 24 s. Tapered structures at the ends of the NMR flow-cell are effective for preventing broadening of the elution band. Log (M̅n) vs. elution time plots for the three PMMA samples (M̅n=3160, 5260, 12600) fall on a single straight line. The results demonstrate the feasibility of the on-line GPC/NMR as an absolute calibration method for GPC.
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