Thermal and electrical dual‐triggered shape memory Eucommia ulmoides gum derived from renewable resources

Abstract

Thermal and electrical dual-triggered shape memory composites were prepared by introducing multi-walled carbon nanotubes (CNTs) into the Eucommia ulmoides gum (EUG) matrix. The morphology of the composites was investigated by scanning electron microscope, and the CNTs exhibited good dispersion in the EUG matrix. The well-dispersed CNTs built a conductive network in the EUG matrix, generating electric current induced heat. The composites showed the shape memory effect upon stimulation by heat and electricity. The composites exhibited increased shape recovery speed with the increase in CNTs content and applied voltage. Furthermore, the composites recovered to 90% of their initial length within 36 V (AC), which is safe for humans. This work provides a feasible material with dual-triggered shape memory characteristics, which can find potential applications in medicine devices.

Biobased and Biodegradable Shape Memory Polymers of Eucommia Ulmoides Gum and Polycaprolactone via Dynamic Vulcanization

“…Shape memory polymers (SMPs) are intelligent and adaptive materials capable of undergoing programmed temporary shape recovery to their original form upon exposure to external stimuli, such as heat, light, magnetism, electricity, etc. − In recent years, SMPs have been extensively investigated and utilized in comparison to conventional shape memory alloys and shape memory ceramics owing to their exceptional shape recoverability, facile fabrication, and cost-effectiveness. SMPs find extensive applications in diverse fields including biomedicine, aerospace, textiles, protective equipment, and so on .…”

Theoretical solutions of short glass fiber/polyurethane composite beams based on Hamiltonian principle

“…In view of the excellent performance of SMP and SMPC, they have attracted widespread attention and have been widely applied in various fields such as biology, electronics, manufacturing, medicine, aerospace, and so on. [5][6][7] As SMP and SMPC is increasingly applied in various fields, theoretical research on the mechanical behavior of them, particularly on constitutive models, is also continuously deepened and developed.…”

Analysis of thermal‐active bending and cyclic tensile shape memory mechanism of UHMWPE/CNT composite

“…In terms of microstructure, SMP is composed of “hard phase” and “soft phase.” The “hard phase” is responsible for memorizing/restoring the permanent shape, while the “soft phase” is responsible for fixing the temporary shape and softening when exposed to external field, such as temperature, [ 8,9 ] light [ 10,11 ] and so on. [ 12–18 ]…”

“…The "hard phase" is responsible for memorizing/restoring the permanent shape, while the "soft phase" is responsible for fixing the temporary shape and softening when exposed to external field, such as temperature, [8,9] light [10,11] and so on. [12][13][14][15][16][17][18] SMP contains at least one permanent shape and one temporary shape, and therefore it can be re-programmed many times. With regards to thermal-active SMP, the permanent shape is obtained in the first molding, and then the frozen "soft phase" is activated to confer the temporary shape by changing external force field and raising temperature at the same time.…”