Abstract Vitrimers are polymeric materials that behave as thermosets at room tempera- ture but, when heated, they exhibit a plastic flow similar to thermoplastics, enabling their reprocessability. A series of new bio-based polyamide-polyamine vitrimers are synthetized starting from tris(2-aminoethyl)amine and epoxidized methyl oleate, a material that can be easily prepared from renewable resources obtainable both from natural products and waste. The incorporation of free amine groups in the network enables the transamidation exchange reaction with the crosslinking amide functions; this reaction, if appropriately catalyzed, donates a full reprocessability to the material. Boric acid, which is known to be a green, cheap and non-toxic catalyst for transamidation reactions, is employed in this work. Once that the optimal condition for the transamidation reaction is found, different catalyst loadings are tested and the obtained materials are subjected to thermal and mechanical characterization. The obtained materials possess good thermal stability up to 300C and a Tg value ranging between 7 and 21C depending on the B(OH)3 content. Furthermore it is possible to observe how the introduction of boric acid in the materials reduces the Ea (inferred from stress-relaxation experiments) of the transamidation reaction from130±8 KJmol-1 to a mean value of 63±4 KJmol-1.

Transamidation-based vitrimers from renewable sources / Pettazzoni, Luca; Leonelli, Francesca; Martinelli, Andrea; Migneco, Luisa Maria; Alfano, Sara; DI LUCA, Daniele; Celio, Lorenzo; DI LISIO, Valerio. - In: JOURNAL OF APPLIED POLYMER SCIENCE. - ISSN 1097-4628. - (2022). [10.1002/app.52408]

Transamidation-based vitrimers from renewable sources

Luca Pettazzoni
Primo
Conceptualization
;
Francesca Leonelli
Supervision
;
Andrea Martinelli
Supervision
;
Luisa Maria Migneco
Writing – Review & Editing
;
Sara Alfano
Investigation
;
Daniele Di Luca
Investigation
;
Lorenzo Celio
Investigation
;
Valerio Di Lisio
Data Curation
2022

Abstract

Abstract Vitrimers are polymeric materials that behave as thermosets at room tempera- ture but, when heated, they exhibit a plastic flow similar to thermoplastics, enabling their reprocessability. A series of new bio-based polyamide-polyamine vitrimers are synthetized starting from tris(2-aminoethyl)amine and epoxidized methyl oleate, a material that can be easily prepared from renewable resources obtainable both from natural products and waste. The incorporation of free amine groups in the network enables the transamidation exchange reaction with the crosslinking amide functions; this reaction, if appropriately catalyzed, donates a full reprocessability to the material. Boric acid, which is known to be a green, cheap and non-toxic catalyst for transamidation reactions, is employed in this work. Once that the optimal condition for the transamidation reaction is found, different catalyst loadings are tested and the obtained materials are subjected to thermal and mechanical characterization. The obtained materials possess good thermal stability up to 300C and a Tg value ranging between 7 and 21C depending on the B(OH)3 content. Furthermore it is possible to observe how the introduction of boric acid in the materials reduces the Ea (inferred from stress-relaxation experiments) of the transamidation reaction from130±8 KJmol-1 to a mean value of 63±4 KJmol-1.
2022
transamidation; vitrimer; sources
01 Pubblicazione su rivista::01a Articolo in rivista
Transamidation-based vitrimers from renewable sources / Pettazzoni, Luca; Leonelli, Francesca; Martinelli, Andrea; Migneco, Luisa Maria; Alfano, Sara; DI LUCA, Daniele; Celio, Lorenzo; DI LISIO, Valerio. - In: JOURNAL OF APPLIED POLYMER SCIENCE. - ISSN 1097-4628. - (2022). [10.1002/app.52408]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1624598
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