dc.contributor.author | Flores, Irma | |
dc.contributor.author | Martínez de Ilarduya, Antxon | |
dc.contributor.author | Sardon Muguruza, Haritz | |
dc.contributor.author | Müller Sánchez, Alejandro Jesús | |
dc.contributor.author | Muñoz-Guerra, Sebastián | |
dc.date.accessioned | 2020-02-25T15:46:48Z | |
dc.date.available | 2020-02-25T15:46:48Z | |
dc.date.issued | 2019-10-26 | |
dc.identifier.citation | European Polymer Journal 122 : (2020) // Article ID 109321 | es_ES |
dc.identifier.issn | 0014-3057 | |
dc.identifier.uri | http://hdl.handle.net/10810/41441 | |
dc.description.abstract | Two series of partially biobased ABA triblock copolyesters were successfully prepared by ring-opening polymerization (ROP) of L-lactide initiated by two telechelic polyester polyols using an organic catalyst. B blocks were made of telechelic poly(hexamethylene terephthalate) (PHT) and poly(hexamethylene 2,5- furandicarboxylate) (PHF), respectively, with average molar masses of around 3500 g mol-1 and A blocks were made of poly(lactic acid)s (PLA) of different block lengths.
For each series, four copolymers with different PHT/PLA and PHF/PLA compositions were prepared by varying the feed molar ratios. The triblock structure of the obtained copolymers was ascertained by 13C NMR, which confirms that the organic catalyst employed does not promote transesterification reactions at the low temperatures used for the reaction. All copolyesters were thermally stable under inert atmosphere up to around 300 °C. For all synthesized copolyesters, the PLA blocks were unable to crystallize, mainly due to racemization reactions taking place during L-lactide ROP. Both, PHT and PHF blocks were able to crystallize and their thermal and structural properties (Tm, Tc, Xc and lamellar thickness) were independent on PLA content until its concentration was very high and topological restrictions difficulted crystallization. According to SAXS, most copolymers were found to be miscible in the melt. Both PLA-b-PHT-b-PLA or PLA-b-PHF-b-PLA triblock copolymers showed a single Tg indicating that the components are miscible in the amorphous state. | es_ES |
dc.description.sponsorship | The POLYMAT/UPV/EHU team would like to acknowledge funding from MINECO through project: MAT2017-83014-C2-1-P, and from ALBA synchrotron facility. We also acknowledge the financial contribution of the Basque Government through grant IT1309-19 and the funding of the European Uniońs Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 778092. Irma Flores would like to acknowledge CONACYT (Mexico) for the Ph.D. grant awarded. | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | Elsevier | es_ES |
dc.relation | info:eu-repo/grantAgreement/EC/H2020/778092 | es_ES |
dc.relation | info:eu-repo/grantAgreement/MINECO/MAT2017-83014-C2-1-P | es_ES |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ | * |
dc.subject | triblock copolymers | es_ES |
dc.subject | organocatalysis | es_ES |
dc.subject | biobased | es_ES |
dc.subject | poly(lactide) | es_ES |
dc.title | ROP and crystallization behaviour of partially renewable triblock aromaticaliphatic copolymers derived from L-lactide | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.rights.holder | CC-BY-NC-ND | es_ES |
dc.relation.publisherversion | https://www.sciencedirect.com/science/article/pii/S0014305719315563?via%3Dihub | es_ES |
dc.identifier.doi | 10.1016/j.eurpolymj.2019.109321 | |
dc.contributor.funder | European Commission | |
dc.departamentoes | Ciencia y tecnología de polímeros | es_ES |
dc.departamentoeu | Polimeroen zientzia eta teknologia | es_ES |