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Controlling plastic behavior with light
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DOI：10.1126/science.aee7263.png)
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Abstract
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Biological materials such as bones and cartilage are often composed of materials with widely different mechanical properties for active adaptation in dynamic environments (1). For example, hard calcium phosphate minerals are embedded in soft protein matrices (collagen) to constitute bones (2). The spatial gradient of hard and soft domains provides superior mechanical toughness, which is essential for resisting fracture under stress. Achieving multifunctionality in engineered materials can also be useful for information storage and imparting flexibility to otherwise rigid objects. However, controlling spatial arrangements of hard and soft regions within a single manufactured material remains a challenge. On page 511 of this issue, Commisso et al. (3) report a strategy to modulate the spatial distribution of crystallinity within a single polymer matrix by applying varying intensities of ultraviolet (UV) light. This represents a crucial milestone for designing complex plastic materials in applications that range from commodity goods to soft robotics.
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ADVANCED MATERIALS
ADVANCED MATERIALSIF26.8
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ShareSaveMultimaterial Thermoset Synthesis: Switching Polymerization Mechanism with Light DosageACS CENTRAL SCIENCE
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ACS CENTRAL SCIENCEIF10.4
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