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Associative exchange reactions of boron or nitrogen containing bonds and design of vitrimers

Abstract : With the aim to generate vitrimers from commonly used thermoplastics with carbon-carbon based backbones, such as PMMA and PS, dynamic covalent exchange reactions relying on Schiff’s bases and boronic esters were investigated. Two different approaches, i.e. crosslinking in solution or in extrusion, were used. These materials are processable via extrusion, compression and injection molding like their thermoplastic counterparts. The crosslinked nature of these systems was confirmed by solubility tests and DMA. Rheological measurements revealed the vitrimers ability to flow and viscosities between 105-107 Pa.s for boronic ester based PMMA vitrimers were measured. Consecutive tensile testing/reprocessing sequences proved the full recyclability of these vitrimers, and selective cleavage of the vitrimer networks followed by precise chemical analyses showed the thermal and chemical stabilities of vitrimers relying on boronic ester bonds. The stress cracking resistance of these vitrimers was significantly higher than that of parent thermoplastics, as can be expected for crosslinked systems.
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  • HAL Id : tel-01956205, version 1

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Max Roettger. Associative exchange reactions of boron or nitrogen containing bonds and design of vitrimers. Chemical Physics [physics.chem-ph]. Université Pierre et Marie Curie - Paris VI, 2016. English. ⟨NNT : 2016PA066608⟩. ⟨tel-01956205⟩

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