Microspheres from stereocomplexes of polylactides containing ionic liquid end-groups

作者：Biedron Tadeusz; Brzezinski Marek; Biela Tadeusz; Kubisa Przemyslaw^*

来源：Journal of Polymer Science Part A: Polymer Chemistry , 2012, 50(21): 4538-4547.

DOI：10.1002/pola.26266

• functionalization of polymers
• ionic liquids
• microspheres
• polyesters
• self-organization
• stereocomplexes

Low-molecular-weight polymers of L- and D-lactide containing different end-groups (hydroxy, butoxy, trifluoromethoxy, heptafluorobutoxy, oxyethylimidazole groups, and groups derived from the imidazolium ionic liquid) are synthesized. It is shown that the nature of end-groups affects the stereocomplexation of corresponding pairs of polymers. Stereocomplex of poly(L-lactide) and poly(D-lactide) containing imidazolium ionic liquid end-groups (PLA-IL) precipitates from 1,4-dioxane solution in the form of monodisperse, perfectly spherical microspheres. Such behavior of PLA-IL, not observed for polymers containing other end-groups, can be attributed to the presence of strongly interacting ionic liquid end-groups. This conclusion is supported by the results of 1H NMR and dynamic light scattering experiments as well as by direct observation of precipitated particles by scanning electron microscopy.

• 出版日期2012-11-1