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Synthesis of bio-based non-isocyanate polyurethanes and their modification towards industrial application

Descrizione del progetto

Sintesi di poliuretani sostenibili a base biologica privi di isocianati

I poliuretani privi di isocianati (NIPU, non-isocyanate polyurethane) rappresentano alternative ecologiche e atossiche ai poliuretani utilizzati nei dispositivi medici, nei rivestimenti, nei materiali isolanti e negli adesivi; ciononostante, il loro impiego su scala industriale presenta alcune difficoltà dovute al basso peso molecolare, alla scarsa reattività e all’elevata idrofilia, che ne compromettono le prestazioni termomeccaniche. Sostenuto dal programma di azioni Marie Skłodowska-Curie, il progetto SPRUT mira a sintetizzare NIPU sostenibili a partire da materiali a base biologica e a modificarli per applicazioni industriali. In primo luogo, il progetto creerà un efficace catalizzatore a base di eteroscorpionato di alluminio per la conversione di bisepossidi a base biologica in bicarbonati ciclici a 5 membri attraverso la fissazione di CO2; quindi, utilizzerà vari metodi per aumentare il peso molecolare dei biocomposti bicarbonati risultanti, che forniranno la materia prima per la sintesi dei NIPU e, infine, apporterà modifiche chimiche per ridurne l’idrofilia.

Obiettivo

This project is devoted to synthesis of non-isocyanate polyurethanes (NIPU) from bio-based sources and their post-modification towards industrial application. The use of bio-based monomers for NIPU synthesis allows to overcome the dependence on fossil resources and to reduce the CO2 emissions. However there are several possible drawbacks for industry such as high prices for bio-based monomers and demand for arable land to ensure large scale production.
NIPU were introduced in 1990s as the alternative to conventional polyurethanes because they allow to avoid usage of toxic isocyanates. However, they were not industrialised due to their insufficient molecular weights limited by reaction ability of monomers and increased hydrophilicity that facilitates hydrolysis during processing.
The SPRUT project will simultaneously deal with several NIPU related issues.
At first, the effective catalyst based on Al heteroscorpionate complexes for converting bio-based bisepoxides to 5-membered cyclic bicarbonates via CO2 addition will be developed. The obtained bicarbonate bio-compounds will be used as feedstock for production of NIPU applying various approaches to increase their MW above 20000 Da: synthesis in bulk, copolymerization of two different bicarbonates and the use of ionic liquids.
In the 2nd stage of the project, the unique method for post-synthetic modification of NIPU that was never used for these polymers will be introduced to increase their mechanical properties and processability. The basic click reaction of bio-based aldehydes (heptaldehyde and benzaldehyde) with adjacent hydroxyl groups in the NIPU backbone enables the reduction of intermolecular hydrogen bonding leading to better processability. The resulting aldehyde modified NIPUs containing non-polar side chains are supposed to be much more hydrophobic and possess increased physico-mechanical properties compared to previously developed NIPU and even some conventional PUs.

Campo scientifico (EuroSciVoc)

Parole chiave

Programma(i)

Argomento(i)

Meccanismo di finanziamento

HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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Invito a presentare proposte

(si apre in una nuova finestra) HORIZON-MSCA-2021-PF-01

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Coordinatore

LUXEMBOURG INSTITUTE OF SCIENCE AND TECHNOLOGY
Contributo netto dell'UE
€ 191 760,00
Indirizzo
5 AVENUE DES HAUTS FOURNEAUX
4362 Esch Sur Alzette
Lussemburgo
Regione
Luxembourg Luxembourg Luxembourg
Tipo di attività
Research Organisations
Collegamenti
Costo totale
Nessun dato