A novel use of Ti-POSS as initiator of L-lactide ring-opening polymerization.
In: Journal of Polymer Science Part A: Polymer Chemistry, Jg. 49 (2011-11-15), Heft 22, S. 4794-4799
academicJournal
Zugriff:
The efficacy of a metal-silsesquioxane, namely, heptaisobutyl (isopropoxyde)titanium-polyhedral oligomeric silsesquioxanes (Ti-POSS), as initiator of the ring-opening polymerization of L-lactide (LLA) has been assessed. Indeed, as demonstrated by proton nuclear magnetic resonance (1H NMR) spectroscopy and gel permeation chromatography (GPC) measurements, a well-controlled polymerization occurs via a coordination-insertion mechanism. Moreover, the above reaction leads to the direct insertion of the silsesquioxane molecule into the polymer backbone, thus producing a hybrid system. Differential scanning calorimetry measurements demonstrated that in comparison with a commercial poly- L-lactide (PLLA), the polymers prepared with Ti-POSS exhibit a higher crystallinity. Indeed, the presence of silsesquioxane molecules, attached to one end of the polymer chains, has been found to appreciably affect the crystal nucleation density. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 [ABSTRACT FROM AUTHOR]
Titel: |
A novel use of Ti-POSS as initiator of L-lactide ring-opening polymerization.
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Autor/in / Beteiligte Person: | Monticelli, Orietta ; Cavallo, Dario ; Bocchini, Sergio ; Frache, Alberto ; Carniato, Fabio ; Tonelotto, Alessandro |
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Zeitschrift: | Journal of Polymer Science Part A: Polymer Chemistry, Jg. 49 (2011-11-15), Heft 22, S. 4794-4799 |
Veröffentlichung: | 2011 |
Medientyp: | academicJournal |
ISSN: | 0887-624X (print) |
DOI: | 10.1002/pola.24926 |
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