Synthesis And Characterization Of The Functional Side Of The Base Aliphatic Polyester

Our aim was to synthesis and characterize copolyesters bearing lateral hydroxyl groups.In this study,we used two methods to realize our imiginations.A series of copolyester poly(butylene succinate-co-benzyl butylene malate) P(BS-co-BBM) have been synthesized with various benzyl butylene malate unit compositions by using a three-step synthetic strategy. Thus, the target linear aliphatic poly(butylene succinate-co-butylene malate) P(BS-co-BM) bearing lateral hydroxyl groups were preliminarily attained through a Pd/C catalyzed hydrogenation to eliminate the benzyl protection groups. In addition, the synthesized copolyesters were systematically characterized by means of NMR, GPC, hydroxyl titration, FT-IR, optical polarimeter and thermal analytical instruments. As a result, the molecular structure dependence of physical properties were discussed for the natural malic acid basedbiodegradable P(BS-co-BBM) and P(BS-co-BM).From starting materials of succinic acid, fumaric acid and 1,4-butanediol, a seriesof poly(butylene succinate-co-butylene fumarate) P(BS-co-BF) bearing various BF comonomer molar contents were synthesized. Subsequently, the carbon double bonds involved in the copolyester main chain were subjected to dihydroxylation with catalyst of osmium tetroxide (OsO4), N-methylmorpholine N-oxide (NMO) and water to prepare novel biodegradable copolyesters bearing hydrophilic hydroxyl pendant groups. In addition.we also characterized the degradation of the polyesters P(BS-co-BF).Moreover, these synthesized copolyesters were further characterized by NMR, GPC, FT-IR, DSC, TGA, WAXD,optical polarimeter and hydroxyl titration.