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Use of fluorescent probes in supporting functional group analysis resulting from polymer ageing

Abstract : Based on the determination of the solvatochromic parameters of a series of polymers with various functional groups containing oxygen atoms, a method was proposed which allowed for discriminating the oxidation products formed by exposure of polymers to photo-and/or thermo-ageing. The polymers used to determine the solvatochromic parameters contained polar groups such as chain-pendant ester (EVA, PMMA, PVAc), chain ester (PLA), alcohol (EVOH, PVA), chain-pendant acid (PAA), ketone (PK), ether (PEO). The solvatochromic parameters π*, α and β were determined following procedures reported in the literature, and it was shown that the most apolar polymer PE, displays the lowest π* value; the presence of acetate groups in PE makes the π* value increase. Polyesters (PLA, PMMA, PVAc) have similar π* values. Then, alcohols and ether groups (EVOH, PVA, PEO) have higher π* values. Finally, the highest π* values are obtained for PAA and PK. Concerning the β value, the highest value was obtained for (PE, EVOH, PEO), which have the highest capacity to accept a proton, and are close to polyethylene in terms of chemical structure. On the contrary, the polymers with the lowest β value are the ones which have acid/ester/ketone functions (PK, PAA, PLA), reflecting their lowest capacity to accept a proton. This method was successfully applied to discriminate the oxidation products formed in thermo-and photo-oxidation of polyethylene which are known to be slightly different due to the Norrish reactions that do not occur in thermooxidation.
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Submitted on : Wednesday, November 25, 2020 - 10:48:56 AM
Last modification on : Sunday, June 26, 2022 - 2:58:28 AM
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Baptiste Hervé, Géraldine Rapp, Pierre-Olivier Bussiere, Jean-Luc Gardette, Sandrine Therias. Use of fluorescent probes in supporting functional group analysis resulting from polymer ageing. Polymer Degradation and Stability, Elsevier, 2020, 177, ⟨10.1016/j.polymdegradstab.2020.109167 Get⟩. ⟨hal-03023127⟩



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