Characterization Of Partially Hydrolyzed Poly(Vinyl Alcohol). I. Sequence Distribution Via H-1 And C-13-Nmr And A Reversed-Phased Gradient Elution Hplc Technique

In this investigation, characterization of the microstructure of three different PVA samples in terms of their degrees of blockiness were performed via 125 MHz C-13-NMR and 500 MHz H-1-NMR measurements. Differences between these PVAs were also discernable by using a high-performance liquid chromatographic technique employing a reverse-phase separation mechanism. The results obtained from these studies reveal small but significant differences between the PVAs, which allow a better understanding of the role of these PVAs in the grafting reactions occurring during the emulsion polymerization of vinyl acetate (VAc) using PVA as emulsifier.