Renewable polymers with excellent stretchability and self-healing ability are interesting for a wide range of applications. A novel type of wholly biobased, self-healing, polyamide-based thermoplastic elastomer was synthesized using a fatty dimer acid and a fatty dimer amine, both containing multiple alkyl chains, through facile one-pot condensation polymerization under different polymerization times. The resulting elastomer shows superior stretchabiblity (up to 2286%), high toughness, and excellent shape recovery after being stretched to different strains. This elastomer also displays high room temperature autonomous self-healing efficiency after fracture and zero water uptake during water immersion. The highly entangled main chain, the multiple dangling chains, the abundant reversible physical bonds, the inter-molecular diffusion and the low ratio of amide to methylene 2 group within the elastomer are responsible for these extraordinary properties. The polymerization time influences the properties of the elastomer. The use of the optimal self-healing thermoplastic elastomer in anti-corrosion coating, piezoresistive sensing and highly stretchable fibres is also demonstrated. The elastomer coating prevents stainless-steel products from corrosion in a salty environment due to its superhydrophobicity. The elastomer serves as a robust flexible substrate for creating self-healing piezoresistive sensors with excellent repeatability and self-healing efficiency.The elastomer fibre yarn can be stretched to 950% of its original length confirming its outstanding stretchability.

Fluorescent dye encapsulation and release using mucoadhesive degradable thiol-functionalized amphiphilic block copolymer microparticles prepared by electrospraying.