Rational design of sustainable diblock copolymers toward strong adhesives and stretchable ionic conductive materials

Sustainable diblock copolymers of poly (isobornyl acrylate)- block -poly (methyl acrylate) (PIBOA- b -PMA) were rationally designed and synthesized with terpenoid-derived monomer IBOA as the rigid segment. These PIBOA- b -PMA diblock copolymers show excellent mechanical performance comparable to traditional triblock copolymer elastomers . They can be successfully utilized as strong sustainable adhesives with good adhesion performance and high adhesive strength . Moreover, stretchable liquid-free ionic conductive materials can be successfully fabricated by incorporating lithium bis(trifluoromethane sulfonyl) imide (LiTFSI) into PIBOA- b -PMA diblock copolymers without leakage or evaporation risks. Intriguingly, these ionic conductive materials show decreased tensile strength compared to that of pristine PIBOA- b -PMA diblock copolymer due to the plasticizing effect while still maintaining excellent extensibility. The resultant stretchable ionic conductive materials show accurate and dramatic resistance change in response to intermittent stretching-retraction deformations, finger joint bending/straightening curvatures, and elbow joint bending/straightening movements, demonstrating exceptional performance. This convenient and facile strategy can offer new opportunities for the development of novel bio-based diblock copolymers toward strong adhesives and stretchable ionic conductive materials.