Telechelic oligo(2,3-dihydroxypropylmethacrylate acetonide)s with aldehyde end functionality prepared by ozonolytic cleavage of poly(2,3-dihydroxypropan-1-methacrylate acetonide-stat-butadiene), prepared by monomer starve-fed emulsion polymerization

摘要

Telechelic oligomers with dialdehyde end groups and 2,3-dihydroxypropan-1-methacrylate acetonide repeat units were prepared by the ozonolytic cleavage of poly(2,3-dihydroxypropan-1-methacrylate acetonide-stat-butadiene) co-polymers. The latter were prepared by monomer starve-fed emulsion polymerization at elevated temperatures and at atmospheric pressure. In contrast to similar copolymerizations of methyl and butyl methacrylate these polymerizations generated a gel fraction as well as the usual soluble copolymer. However, following ozonolysis and work up with dimethyl sulphide the whole reaction mixture became soluble. Impurities derived from oligomers with carboxylic acid end groups were removed by preparative ion exchange with a strong base ion exchange resin. The oligomers have potential applications as components of amphiphilic networks.