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January 21, 2018 at 08 AM - westmidlands

4D printing makes objects that assemble themselves when heated

Added by David Hill on April 22 2017, at 5:48 am
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  • A new 4D-printing technique that creates complex structures in minutes could be used to make temperature-activated cardiac stents, drug capsules and flat-pack furniture.


    4D printing creates 3D objects that change their shape over time in response to stimuli such as heat, moisture or light. It is useful for making structures that can adapt to their environment, but is often a laborious process. The most common materials used in 4D printing, shape-memory polymers, normally require at least five steps to make them into adaptable objects. Hydrogels are simpler to use, but too soft to fashion into rigid structures.


    Zhen Ding at the Singapore University of Technology and Design and his colleagues have now developed a way to rapidly print rigid 4D objects with a commercial 3D printer and a heat source.


     



     


     


    They created a variety of objects, including a delicate flower that closes its petals, a flat star shape that morphs into a dome, and lattices that contract and elongate. The structures were made from flat 3D-printed strips that were then heated to make them curve.


    The strips, which can be printed in less than a minute, are made from layers of a stiff shape-memory polymer paired with a rubbery elastomer – a polymer with elastic properties.


    When heated to 45°C, the shape-memory polymer component relaxes and allows the elastomer to bend. As the strip cools, the shape-memory polymer stiffens again and locks the object into its new, curved configuration.



    For more you can check :  Professional Animation Production Pricing


     

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  • Armstrong Smith
    Armstrong Smith

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    June 22, 2017