In this study, dynamic
imine covalent bonds were introduced into
vanillin-based vitrimers networks, endowing thermosets with hot-reprocessing
ability and chemical recyclability under acid hydrolysis. First, dialdehyde
monomer, which was synthesized from lignin-derived vanillin monomer,
was reacted with conventional amine cross-linkers to form dynamic
imine bond networks. Even after three hot-processing cycles, the tensile
strength and elongation at break of polyschiff vitrimers could be
recovered at least up to 71.2 and 72.8%, respectively, through the
imine metathesis reaction. Importantly, the dialdehyde monomers showed
enhanced recyclability under strong acid solution and could be reused
to regenerate polyschiff vitrimers. These characteristics of reprocessablility,
recyclablility, and biobased monomer present a feasible way to satisfy
the demands of sustainability.
In this study, a series of self-crosslinked acrylic rubbers were prepared by gamma ray initiated emulsion copolymerization. Acrylic acid and N-hydroxymethl acrylamide were used as the cure-site monomers. The vulcanizing properties, tensile properties, and dynamic mechanical analysis of the self-crosslinked acrylic rubbers were investigated. It was found that the curing characteristics could be influenced significantly by the content and species of the cure-site monomers. Improvement in mechanical properties like tensile strength, modulus and elongation at break was observed in the prepared selfcrosslinked rubber. The structure-property correlation of the self-crosslinked acrylic rubber was discussed.
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