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      Ultrafast Digital Printing toward 4D Shape Changing Materials

      , , , , , , ,
      Advanced Materials
      Wiley-Blackwell

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          Additive manufacturing. Continuous liquid interface production of 3D objects.

          Additive manufacturing processes such as 3D printing use time-consuming, stepwise layer-by-layer approaches to object fabrication. We demonstrate the continuous generation of monolithic polymeric parts up to tens of centimeters in size with feature resolution below 100 micrometers. Continuous liquid interface production is achieved with an oxygen-permeable window below the ultraviolet image projection plane, which creates a "dead zone" (persistent liquid interface) where photopolymerization is inhibited between the window and the polymerizing part. We delineate critical control parameters and show that complex solid parts can be drawn out of the resin at rates of hundreds of millimeters per hour. These print speeds allow parts to be produced in minutes instead of hours.
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            Recent progress in shape memory polymer: New behavior, enabling materials, and mechanistic understanding

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              Additive manufacturing of polymer-derived ceramics.

              The extremely high melting point of many ceramics adds challenges to additive manufacturing as compared with metals and polymers. Because ceramics cannot be cast or machined easily, three-dimensional (3D) printing enables a big leap in geometrical flexibility. We report preceramic monomers that are cured with ultraviolet light in a stereolithography 3D printer or through a patterned mask, forming 3D polymer structures that can have complex shape and cellular architecture. These polymer structures can be pyrolyzed to a ceramic with uniform shrinkage and virtually no porosity. Silicon oxycarbide microlattice and honeycomb cellular materials fabricated with this approach exhibit higher strength than ceramic foams of similar density. Additive manufacturing of such materials is of interest for propulsion components, thermal protection systems, porous burners, microelectromechanical systems, and electronic device packaging.
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                Author and article information

                Journal
                Advanced Materials
                Adv. Mater.
                Wiley-Blackwell
                09359648
                February 2017
                February 2017
                : 29
                : 7
                : 1605390
                Article
                10.1002/adma.201605390
                516299fe-0243-4449-b0a7-bfa93dc120cf
                © 2017

                http://doi.wiley.com/10.1002/tdm_license_1

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