Diego Ciardi, Ianis Retailleau, François Tournilhac
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The Soap Opera of Metal Catalysis in Epoxy-Acid Vitrimers
Precipitation of bivalent metal carboxylates is a well-known issue in detergency, resulting in decreased efficiency and unwanted accumulation of lime soap on laundry. We demonstrate that the same phenomenon occurs in formulations of metal-catalyzed epoxy-acid vitrimers. When, for instance, a Zn(II) salt and glutaric acid are allowed to be in contact with each other in the same reaction feedstock, precipitation takes place, resulting in phase separation of zinc glutarate and a glutarate-poor polymer network, showing no vitrimer properties. We present a strategy to overcome this issue based on step addition at a single end of the dicarboxylic acid monomer prior to contacting with zinc. In this case, formation of crystalline zinc soap is completely avoided, and the network shows thermostimulated stress relaxation. This strategy is particularly appealing for the synthesis of polyhydroxyester networks showing high-glass-transition temperature and fast relaxation.
期刊介绍：
Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.
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