用光控制塑料行为

Thermoplastic properties are spatially tuned with light intensity during three-dimensional (3D) printing Jake L. Nicholson1 and Quentin Michaudel1,2 Biological materials such as bones and cartilage are often composed of materials with widely differ- ent 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 frac- ture under stress. Achieving multifunctionality in engineered materials can also be useful for information storage and im- parting flexibility to otherwise rigid objects. However, con- trolling spatial arrangements of hard and soft regions within a single manufactured material remains a challenge. …