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Novel Hybrid Poly(L-lactic acid) from titanium oxo-cluster via reactive extrusion polymerization

Abstract : This paper reports the synthesis of novel hybrid poly(lactic acid) by use of a titanium oxo-cluster, acting both as a catalyst and crosslinking agent of the polymer matrix. The already reported oxo-cluster Ti16O16(OEt)32 ([Ti]16) was synthesized and screened at the lab-scale as catalyst for the bulk polymerization of L-lactide (L-LA). [Ti]16 was found to be highly active for this reaction as up to 90% conversion in 30 min was obtained, affording PLLAs with Mn up to 65 000 g·mol−1 and relatively narrow dispersities (1.2–1.6). These polymerization reactions were further transposed to reactive extrusion process in which [Ti]16 oxo-cluster kept its high activity, affording hybrid-PLLA materials with Mn close to 58 000 g·mol−1 (some PLLAs could not be dissolved). Electronic microprobe analysis of the resulting hybrid materials confirmed that the titanium oxo-cluster was well dispersed all over the PLLA matrix. Finally, it was shown that the hybrid PLLA containing [Ti]16 display superior dimensional stability under heat than commercial PLLA of same molar mass.
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https://hal.univ-lille.fr/hal-02359230
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Soumis le : vendredi 13 novembre 2020 - 15:27:08
Dernière modification le : samedi 21 novembre 2020 - 03:09:06
Archivage à long terme le : : dimanche 14 février 2021 - 19:20:40

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Elodie Louisy, Séverine Bellayer, Gaelle Fontaine, Laurence Rozes, Fanny Bonnet. Novel Hybrid Poly(L-lactic acid) from titanium oxo-cluster via reactive extrusion polymerization. European Polymer Journal, Elsevier, 2020, European Polymer Journal, 122, pp.109238. ⟨10.1016/j.eurpolymj.2019.109238⟩. ⟨hal-02359230⟩

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