SYNTHESIS |
A solution of 22 mmole acetyl chloride (1.6 ml in 10 ml chloroform) was added to a stirring mixture of 1.16 g (10 mmole) sebacic acid and 2.5 g (22 mmole) poly(4-vinylpyridine) (PVP) in 15 ml chloroform immersed in an ice water bath. The reaction was continued overnight at room temperature. The mixture was then filtered and the filtrate evaporated to dryness. Excess acetyl chloride was removed by vacuum over 24 hours. The residue was washed with diethylether: petroleum ether (1:1). 1.5 g was recovered (80% yield). The prepolymer had a melting point of 70.degree. C., IR (KBr, pelat, cm.sup.1) anhydride 1800, 1740 'H-NMR (CDCl.sub.13, ppm) 6.92 (s,2H), 2.32 (s,6H).
|