title: Synthesis of the star-shaped copolymer of epsilon-caprolactone and L-lactide from a cyclotriphosphazene core.
abstract: Hexakis[p-(hydroxylmethyl)phenoxy]cyclotriphosphazene was synthesized by the reaction of hexachlorocyclotriphosphazene with the sodium salt of 4-hydroxybenzaldehyde and subsequent reduction of aldehyde groups to alcohol groups by using sodium borohydride. This compound was employed in initiating the ring-opening polymerization of epsilon-caprolactone and L-lactide to produce star-shaped poly(L-lactide) (PLA), poly(epsilon-caprolactone) (PCL), and their block copolymer with cyclophosphazene cores. 1H NMR and GPC analysis showed narrow-distributed star-shaped polyesters were successfully synthesized with high yields.
authors: School of Chemistry and Chemical Technology, State Key Laboratory for Composite Materials, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
authors: Yanjun
authors: Y
authors: Cui
authors: Xiaozhen
authors: X
authors: Tang
authors: Xiaobin
authors: X
authors: Huang
authors: Yan
authors: Y
authors: Chen
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D009570:Nitriles / Q000737:chemistry; D017553:Phosphorus Compounds / Q000737:chemistry; D011091:Polyesters / Q000138:chemical synthesis*
chemical_list: D009570:Nitriles; D017553:Phosphorus Compounds; D011091:Polyesters; C068226:cyclotriphosphazene ester; C062968:lactide-caprolactone copolymer