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Synthesis And Stereocomplex Formation Of Star-Shaped Stereoblock Polylactides Consisting Of Poly(l-lactide) And Poly(d-lactide) Arms

Takuya Isono, Y. Kondo, I. Otsuka, Y. Nishiyama, R. Borsali, T. Kakuchi, Toshifumi Satoh
Published 2013 · Chemistry

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The synthesis of star-shaped polylactides (PLAs) having both poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) arms in one molecule, i.e., stereo-miktoarm star-shaped PLAs, is described. The azido-functionalized PDLAs and ethynyl-functionalized PLLA possessing linear and two- and three-branched structures were prepared by the ring-opening polymerization of d-lactide and l-lactide using azido- or ethynyl-functionalized initiators. The number-average molecular weights (Mn,NMRs) of the PLAs were ca. 5000 g mol–1 with narrow molecular weight distributions (Mw/Mns) of less than 1.18. The click reaction of the azido-functionalized PDLAs and the ethynyl-functionalized PLLAs using the copper(I) bromide/N,N,N′,N″,N″-pentamethyldiethylenetriamine catalyst in a mixed solvent of dichloromethane/1,1,1,3,3,3-hexafluoro-2-propanol (14/1, v/v) gave a linear stereoblock PLA as well as 3-, 4-, 5-, and 6-armed stereo-miktoarm star-shaped PLAs with Mn,NMRs of ca. 10 000 g mol–1 and Mw/Mns of less than 1.16. The wide-angle X-...
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