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Designing New Materials for Additive Manufacturing: Vat PhotopolymerizationFebruary 16, 2018 (Fri) 3:00 US/EasternHi, I thought you might be interested in these webinars. To find out more go to: Designing New Materials for Additive Manufacturing: Vat Photopolymerization

Designing New Materials for Additive Manufacturing: Vat PhotopolymerizationFebruary 16, 2018 (Fri) 3:00 US/Eastern

3D printing, or additive manufacturing (AM), provides diverse opportunities to create previously unattainable geometric objects through a layer-by-layer fabrication process. Novel macromolecular structures and synthetic methods in synergy with unique methods of printing demonstrated micron-scale resolution 3D part generation tunable to emerging technologies. Microstereolithography of poly(amic diethyl acrylate ester)s yielded soft 3D organogels. Upon thermal imidization, this organogel transformed into a 3D structured thermoplastic polyimide, which is unachievable in conventional manufacturing. Furthermore, the backbone of the polyimide exhibited versatility through processing of both rigid-rod, insoluble thermoplastics and amorphous, melt-processable thermoplastics. These unprecedented polyimide objects offer immediate impact in aerospace, medical, architectural, and automotive applications. The versatility of 3D printing also provides micron-scale resolution of poly(ether ester) ionomers through low temperature material extrusion for the inclusion of biologics and therapeutics. Typical melt polymerization of poly(ether ester) ionomers from poly(ethylene glycol) and sulfonated isophthalate provided water-soluble polymers capable of complete ion exchange. The incorporation of divalent counterions such as calcium, magnesium, and zinc provided an increase in melt viscosity necessary for low temperature material extrusion 3D printing. Filament of poly(ether ester) ionomers with a calcium counterion revealed successful, flexible filament for subsequent processing. 3D printed structures maintain shape upon printing without flow from the nozzle, successfully demonstrating material extrusion from filament for the first time below 80 C. By tuning polymer structure, printing type, and printing parameters, diverse structures for vastly different applications ranging from drug delivery and controlled release fertilizers to satellites and aerospace. This lecture will highlight structure-property-processing relationships for the design of advanced materials for several additive manufacturing platforms. The synergy of chemistry and mechanical engineering will be demonstrated in each case study.

Dr. Timothy Longis Professor of Chemistry at Virginia Tech and Director of the universitys Macromolecules Innovation Institute (MII), located within the Institute for Critical Technology and Applied Science (ICTAS). He spent nearly a decade as a research scientist at Eastman Kodak Company and Eastman Chemical Company before returning to Virginia Tech, where he earned his Ph.D. He has over 50 patents in the field of macromolecular science and engineering, and has exceeded 240 peer-reviewed publications. He is the recipient of the 2015 Virginia Outstanding Scientist award and is a Fellow of the American Chemical Society (ACS) and the AAAS. Dr. Long maintains a vigorous partnership with diverse industries with a focus on novel macromolecular structure to tailor properties and processing. His groups continuing research goal is to integrate fundamental research in novel macromolecular structure and polymerization processes with the development of high performance macromolecules for advanced technologies. His research interests include new synthetic methods for polymerization, structure-property relationship of polymers, block copolymers and thermoplastic elastomers, and functional polymers for additive manufacturing (3D printing).

Professor Christopher Williamsreceived his B.S. in Mechanical Engineering from the University of Florida, and his M.S. and Ph.D. in Mechanical Engineering from the Georgia Institute of Technology. He is the director of the DREAMS laboratory that designs and researches additive manufacturing systems, and associate director of the Macromolecules Innovation Institute. His contributions have been recognized by eight Best Paper awards at international design, manufacturing, and engineering education conferences. He is a recipient of a National Science Foundation CAREER Award (2013), the 2012 International Outstanding Young Researcher in Freeform and Additive Fabrication Award, and the 2010 Emerald Engineering Additive Manufacturing Outstanding Doctoral Research Award.

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