Poly diblock copolyesters

I. Barakat, P. Dubois, C. Grandfils, R. Jerome, Poly(e-caprolactone-b-glycolide) and poly(D, L-lactide-b-glycolide) diblock copolyesters controlled synthesis, characterization, and colloidal dispersions. J. Polym. Sci. A Polym. Chem. 39 (2001) 294-306, doi 10.1002/1099-0518(20010115)39 2<294 aid-pola50>3.0.co 2-a. 

Aluminum isopropoxide has been used for the preparation of block copolyesters [147, 148]. Tri-block poly(e-CL-b-DXO-e-CL) was prepared by the sequential addition of different monomers to a living polymerization system initiated with aluminum isopropoxide in THF or toluene solution [95]. An alternative route for the preparation of the tri-block copolymer was to react the diblock poly(e-CL-b-DXO) containing an -OH functionality at the chain end using a difunctional coupling agent such as isocyanate or acid chloride (Scheme 18). However, the molecular weights were low and full conversion of monomers was not achieved. 

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