Controlling polylactide stereocomplex (sc-PLA) self-assembly: From microspheres to nanoparticles
PBN-AR
Instytucja
Centrum Badań Molekularnych i Makromolekularnych Polskiej Akademii Nauk
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
angielski
Czasopismo
POLYMER
ISSN
0032-3861
EISSN
1873-2291
Wydawca
ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
DOI
URL
Rok publikacji
2016
Numer zeszytu
Strony od-do
242-248
Numer tomu
90
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
Streszczenia
Język
angielski
Treść
Linear and star-shaped polymers have been synthesized by the controlled ring-opening (ROP) polymerization of L-and D-lactide using 1-methyl-2-hydroxymethyl-3-butylimidazolium tetrafluoroborate and dipentaerythritol as initiators, respectively. To introduce carboxylic end-groups onto the star-shaped polylactides, the reaction of -OH end-groups with succinic anhydride was employed. Afterwards, the starting and modified polylactides were used for the preparation of star-shaped and star-shaped/linear stereocomplexes in 1,4-dioxane and tetrahydrofuran (THF). In these solvents, the stereocomplexes spontaneously precipitated. Star-shaped stereocomplexes with hydroxyl end-groups formed microspheres with diameters ranging from 1 to 4 mm (depending on the initial concentration of sc-PLA components) following precipitation from THF. However, the combined effect of the nature of the end-groups and PLA architecture causes the formation of uniform stereocomplex nanoparticles (similar to 400 nm) in 1,4-dioxane from the combination of star-shaped PLA functionalized with carboxylic end-groups and linear PLA with ionic liquid end-groups. Microscopic analysis showed that nanometre-sized grains of stereocomplexes (similar to 30 nm) aggregated to form larger stereocomplex nanoparticles. It was observed that the combination of three factors, i.e., the end-group interactions, architecture of the enantiomeric components, and basicity of the solvent in which the stereocomplexes are prepared, influences the properties and morphology of the final stereocomplex-based materials. (C) 2016 Elsevier Ltd. All rights reserved.
Cechy publikacji
Oryginalny artykuł naukowy
Inne
System-identifier
PX-57a14248c2dc24e66d21c634
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