The integration of superb mechanical performance, good recyclability, and environmental friendliness is of key significance for the practical application of polyamide elastomers. However, the mutually exclusive conflicts among these properties make it challenging to balance them simultaneously. Herein, we describe a facile strategy to synthesize sustainable castor oil-derived polyamide elastomers with robust strength and good recyclability by means of dynamic vinylogous urethane chemistry. Distinctive acetoacetate−amine adducts with thermal-triggered dissociation and reassociation dynamics serve as chemical cross-linking units to provide cross-linking rigidity and reconstruction properties. Meanwhile, a amide hydrogen bonding array induced crystalline-tunable microstructure is employed to store entropic energy during dynamic behavior to achieve polymer system stability. Moreover, the amorphous phase forms stiff crystals when it is stretched through a transition that orders interchain hydrogen bonding, yielding a characteristic of excellent self-strengthening by mechanical training. Due to this property, the prepared polyamide elastomers exhibit high mechanical performance with a tensile strength of up to 156 MPa, an elastic recovery of 94%, and good recyclability with a tensile strength recovery of 95.6%, far superior to those of the reported polyamide elastomers.
Synthesis of waterborne polymers from biomass via emulsion polymerization has gained more and more interest. Plant oils are one of the most abundant renewable resources. However, in most cases, plant oil-derived monomers are difficult to polymerize through emulsion polymerization due to the existence of hydrophobic and unsaturated fatty acids. Herein, plant oil-acrylate epoxy monomers were synthesized efficiently. Miniemulsion polymerization was applied to obtain plant oil-acrylate epoxy latexes. Stable latexes containing epoxy moieties with monomer conversion rate exceeding 99% were successfully obtained and characterized. By taking advantages of the epoxy groups presented in the latexes, excellent adhesion properties were obtained (1.5 MPa shear strength). These plant oil-acrylate epoxy monomers were also copolymerized with vinyl acetate (VAc) to modify the commercial PVAc latexes. Waterborne latexes with better adhesion properties, water resistance, and tensile strength were obtained, compared with PVAc latex. Furthermore, the fully biobased waterborne epoxy resin was prepared by using citric acid as the cross-linking agent. The existing dynamic β-hydroxyl ester chemical networks enable great potential as a reconfigurable and recyclable coating.
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