This communication deals with the coordination-insertion ring-opening polymerization of 1,4-dioxan-2-one (DX) as initiated by aluminium triiso-propoxide (Al(OiPr)3) either in bulk or in solution. First, polymerization of DX has been carried out in bulk at 100°C and compared to the ring-opening polymerization promoted by tin(II)octoate. Block copolymers of ε-caprolactone (CL) and DX have been then selectively obtained by first initiating CL polymerization with Al(OiPr)3 in toluene and then adding DX to the living PCL macroinitiator solution at room temperature. In spite of the inherent poor solubility of poly(1,4-dioxan-2-one) in most organic solvents, DX polymerization has proven to proceed through a "living" mechanism. Interestingly enough, the semi-crystalline P[CL-b-DX] block copolymers displayed two well separated melting endotherms at ca. 55 and 102°C for PCL and PDX sequences, respectively.
|Pages (de - à)||1063-1071|
|Nombre de pages||9|
|journal||Macromolecular Rapid Communications|
|Numéro de publication||15|
|Etat de la publication||Publié - 1 janv. 2000|