Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"4D printing"”.
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4D printing : towards biomimetic additive manufacturing
… to external constraints through adaptation, "4D printing" addresses additive fabrication of artifacts with one or more additional design dimension, such as material variation over distance or direction and response or adaptation over time. This work presents and evaluates a series of enabling …
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4D Printing Shape Memory Polymers for Biomedical Applications
<p>The development of 3D printing techniques using shape-memory polymers (SMPs) hascreated potentials for creating dynamic, three-dimensional structures that can be produced rapidly and be customized for specific and complex architectures. These qualities have made 3D printing a popular fabrication …
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Characterize the molecular dynamics of materials for 4D printing
4D printing is a nascent field that is foundational for fabrication of complex 3D objects with programmable, temporal attributes that undergo exceptional configuration changes of the 3D structure. While gel-based composite inks are at the crux, the lack of a foundational, materials chemistry …
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4D-Printing with Cellulose Nanocrystal Thermoplastic Nanocomposites: Mechanical Adaptivity and Thermal Influence
… optimization of a processing window for 3D printing of mechanically responsive composites and the influence of temperature on mechanical adaptivity, thermal stability, and rheology. CNC thermoplastic nanocomposites are a water responsive, mechanically adaptive material that has been gaining …
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Fused filament fabrication to manufacture three- and four-dimensional objects made of shape memory polymers
… manufacturing (AM), alias three-dimensional (3D) printing, is an effective layer-by-layer technique to process thermoplastic polymers into 3D objects. Amidst various AM technologies, fused filament fabrication (FFF) is a hot-melt extrusion-based 3D printing process and is widely prevalent. The …
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Application-oriented development of thermoplastic polyurethanes with shape memory properties
… a 1W-SME directly after additive manufacturing (4D-printing) without the need of an additional programming step. The structure-property relationships and material characteristics allowed for targeted customization of TPUs. The 2W-SME of polyester-based TPUs enabled actuation in soft robotics, for …
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Computer-Guided Design of Photocatalyst for PET-RAFT Polymerisation
… synthesis such as surface patterning, 3D/4D printing, polymeric micelles, multiblock antimicrobial polymers with precise sequences and architectures. All these unique features of photo-controlled polymerisation are largely dependent on properties and functionalities of PCs. Traditionally, …
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Hierarchical design of morphing shape-memory polymer structures via topology optimization
… kinematic characteristics are validated using a 4D printing technique. The main goal of this design stage is to use these basic twisting and bending structures to computationally design a self-tying knot. A forward kinematics framework is implemented using these bending and twisting angles as …
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STUDY OF SOLUBLE OR BIODEGRADABLE DEVICES FOR PROLONGED DRUG DELIVERY IN HOLLOW ORGANS
… attention to innovative techniques such as 3D or 4D printing. For what concerns urinary bladder, a prototype of a DDS able to be administered through catheter was produced. Such system was made in a shape of a ring consisting of coated mini-matrices loaded with a drug tracer and connected by an …