Structural design of polyurethane/poly(butylene succinate)/polycaprolactone compounds via a multilayer-assembled strategy: achieving tunable triple-shape memory performances

Abstract

Novel strategy for structural design of multicomponent systems via layer-multiplying co-extrusion: achieving tunable triple-shape memory performances of polyurethane/poly(butylene succinate)/polycaprolactone compounds.

Solvent Responsive Shape Memory Polymers‐ Evolution, Current Status, and Future Outlook

“…Numerous factors outline a polymer's ability to exhibit excellent shape memory behavior. [28][29][30][31] First, the polymer should have a high ability to retain the fixed shape and is primarily determined by the strength of the temporary network. Second, the ability of the polymer to recover perfectly to its original shape and is driven by the properties of the permanent network (cross-link density, stress relaxation behavior, creep).…”

“…The temporary segment plastically or quasi-plastically altering its shape to maintain the temporary shape releases its constraints to help the material regain its original shape. [28][29][30][31] Apart from the thermodynamics and the chemistry of the shape fixity/ shape recovery process of SMPs, the usage of the correct stimulus, also tunes the SMP to be efficient and versatile. Figure 3 attempts to contrast the outreach of the realm of the shape memory polymer till present as sourced from SciFinder Water-induced recovery process in polyurethane.…”

Body Temperature-Triggered Shape-Memory Effect via Toughening Sustainable Poly(propylene carbonate) with Thermoplastic Polyurethane: toward Potential Application of Biomedical Stents

“…Limited by the human physiological environment, the switching temperature ( T s ) of shape-memory stents should be around body temperature for realizing body heat-triggering self-expansion or on-demand activation of shape transition. In principle, TSMPs are prepared by fabrication of the two-component structure containing switching and permanent domains. − The switching component (SC) with a reversible thermal transition determines T s and controls the molecular chain movement with the temperature change, realizing fixation and activation of the temporary shape. Besides, the permanent component (PC) composed of either chemical or physical cross-links sets the permanent shape and ensures the recovery efficiency by restraining irreversible chain slippage.…”

Multilayered assembly of poly(vinylidene fluoride) and poly(methyl methacrylate) for achieving multi-shape memory effects

“…[17] However, to memorized more temporary shapes, the previous-reported multilayered MSMPs were fabricated by introducing multiple well-defined thermal transitions, which means more components were required to achieve the multi-shape memory capacity. [10,18] Actually, an intriguing aspect of the multilayer structures lies in the structural assembly perpendicular to the layer interfaces. As schematically illustrated in Figure 1, the compositions represented by red and blue colors can be regarded as alternately-organized "blocks" with different Ttrans like that in block copolymers.…”