The toughness of a high-performance thermosetting epoxy network can be greatly improved by generating polyether sulfone-based macro- to nano-scale morphologies. Two polyethersulfones (PES) which only differ by their chain-end nature have been successively investigated as potential tougheners of a high-T thermoset matrix based on a mixture of trifunctional and difunctional aromatic epoxies and an aromatic diamine. For a given PES content, morphologies and toughness of the resulting matrices have been tuned by changing curing conditions and put into perspective with PES chain-end nature.
View Article and Find Full Text PDFAmines are key intermediates in the chemical industry due to their nucleophilic characteristic which confers a high reactivity to them. Thus, they are key monomers for the synthesis of polyamides, polyureas, polyepoxydes, which are all of growing interest in automotive, aerospace, building, or health applications. Despite a growing interest for biobased monomers and polymers, and particularly polyamides, it should be noticed that very few natural amines are available.
View Article and Find Full Text PDFThe design of dialkyne and diazide functionalized dianhydrohexitol stereoisomers (1-6) afforded a new family of starch-based polytriazoles (7-15) with defined stereochemistry through A(2) + B(2) CuAAC step growth polymerization. The present strategy gave rise to polytriazoles having a high biosourced weight fraction (superior to 60% wt) and exhibiting relatively high molar masses (M(n) = 8-17 kg/mol) that could be easily dissolved in DMF or DMSO. The obtained materials were amorphous and displayed high transition temperatures (T(g) = 125-166 °C) as well as good resistance to thermal degradation (T(d10) = 325-347 °C).
View Article and Find Full Text PDFA novel step growth polymerization A-B strategy based on the click chemistry polyaddition of tailor-made alpha-azide-omega-alkyne low molar mass monomers was developed, leading to polytriazole (co)polymers with tunable structures and properties.
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