A solid state ~3C cross-polarization/magic angle spinning n.m.r, study was carried out to elucidate the structure of carbofuran inside starch crosslinked by urea formaldehyde. It was confirmed that carbofuran is physically entrapped in the matrix. Linewidth measurements showed the maximum degree of crosslinking occurs for a urea to starch ratio of 0.6 (w/w). The observed trends in relaxation times showed that release and swelling phenomena are partly governed by the relaxation mechanism. This conclusion is similar to that obtained from in vitro release kinetics of carbofuran from crosslinked starch matrix.
Посилання на статтю:
Structure of carbofuran in crosslinked starch matrix by 13C n.m.r. : correlation Of release and swelling kinetics with the dynamic behaviour of polymer chains / Parshuram G. Shukla, Swaminathan Sivaramt andBaijayantimala Mohanty // Polymer. – 1992. – Vol 33. – P. 3611-3615.