Abstract
Abstract Collagen skin (CS) composed of collagen fiber is environment friendly biomaterial may be responsive to water for shape recovery form their temporarily fixed shape. This water induced smart behavior is regarded as shape memory (SM) ability. In this study, the water induced SM effect of CS and its mechanism regarding to structural component was first time investigated. The fixability under both axial and non-axial deformation are high with the fixation rate reach up to 100% while the shape recovery rate (ranged from 60 % to 98 %) is related to the temporary shape and cycle numbers. The effect of water on mechanical behavior, thermal properties, and structural component (hydrogen bonds) of CS the were systematically examined. The reversible cleavage and reforming of hydrogen bonds within collagen was thereafter proposed as “switch” to trigger the shape deformation and recovery in the hypothesized SM mechanism model. This research is expected to reveal a sophisticated structure not found in literature for extremely smart materials and demonstrate an excellent example of adding value to unwanted, discarded by-products by turning into desired and functional materials
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