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Dual reconfigurable network from a semi-crystalline functional polyolefin

Article dans une revue avec comité de lecture
Author
CIARDI, Diego
573130 Chimie Moléculaire, Macromoléculaire et Matériaux (UMR7167) [C3M]
ccRIGATELLI, Benedetta
203996 Ingénierie des Matériaux Polymères [IMP]
1061772 Catalyse, Polymérisation, Procédés et Matériaux [CP2M]
ccRICHAUD, Emmanuel
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ccCLOITRE, Michel
573130 Chimie Moléculaire, Macromoléculaire et Matériaux (UMR7167) [C3M]
ccTOURNILHAC, Francois
573130 Chimie Moléculaire, Macromoléculaire et Matériaux (UMR7167) [C3M]

URI
http://hdl.handle.net/10985/26089
DOI
10.1016/j.polymer.2024.126864
Date
2024-03
Journal
Polymer

Abstract

A statistical copolymer p(E-co-GMA) of ethylene and glycidyle methacrylate (4.5 wt%) is considered as a starting point towards semicrystalline networks with exchangeable links. Application of the binomial law to size exclusion chromatographic data suggests that chains deprived of reactive comonomers would represent less than 6 wt% of the total, allowing to expect the formation of high gel-content networks. Experimentally, up to 98 wt% gel is obtained upon modification with 3,3′-dithiopropionic acid (DTPA). The crosslinking reaction can be performed in the molten state through a 2-steps procedure: 1°) x mol. of a commercial grade p(E-co-GMA), y mol. of DTPA and z mol. of triazabicyclodecene (TBD) are sheared in a twin-screw compounder at 115 °C, a temperature right above the melting point of the polymer precursor, without triggerring the epoxy-acid addition; 2°) the thermolatent reactive blend thereby obtained is then crosslinked at 170 °C. Samples with x = 1, y = 1 to 4 and z = 0 to 0.8 were thus prepared and evaluated. The presence of TBD accelerates disulfide exchange reaction, possibly by involvement of the thiolate anion whereas it decelerates the epoxy-acid addition. The final networks present several characteristic properties of vitrimers such as insolubility in xylene above the melting point, thermo-activated stress relaxation and creep. Particular shape memory regimes, related to the semicrystalline vitrimer character and the high insoluble fraction are demonstrated. Eventually, production scale-up using continuous reactive extrusion is evaluated.

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