Bios and Abstracts

Speaker Name

Roger Assaker e-Xstream engineering Additive manufacturing of polymers is transitioning from rapid prototyping to a true industrial production technique. While it brings valuable opportunities to the automotive industry, such as drastically facilitating the spare part supply chain or allowing multi-material and multi-functional designs, it also still comes with a series of challenges to the engineers. Reliability of the mechanical properties of the final part still has some uncertainty and is not fully supported by standard engineering tools. Dimensional accuracy is not always met and cannot be predicted prior to printing.

 

Lu Wang

**2016-2017 SPE ACCE scholarship winner”

 

University of Maine Additive manufacturing is reshaping the world by reforming the way materials are manufactured. Extrusion-based additive manufacturing is one of the techniques that can be used for printing thermoplastics and their composites. Polypropylene (PP) is one of the most widely used polymers in automobile industry: cheap but versatile. However, isotactic PP experiences great difficulty in printing attributed to its fast crystallization rate. Moreover, printed parts have been deemed weaker than their molded counterparts. This research focuses identifying the right formula to facilitate the printing of PP and comparing the properties of printed and molded PP. Tests performed include density, mechanical testing, dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), SEM and parallel-plate rheometer. Lu Wang holds a B.S. degree from the Department of Wood Science at Central South Forestry University (Changsha, Hunan, China). He continued to study bamboo-based engineering composites at Nanjing Forestry University (Nanjing, Jiangsu, China) and graduated in 2013 with an M.S. degree. He currently is a Ph.D. candidate at University of Maine under the supervision of Prof. Douglas Gardner. He has won numerous awards including the George L. Houston Scholarship (2014) and Blumenstock Family Forest Products Graduate Student of the Year Award (2015) from the School of Forest Resources at UMaine. In addition, he co-mentored 3 students from the National Science Foundation-Research Experience for Undergraduate (NSF-REU) for the research in cellulose nanofiber modification and 3D printing. After graduation, he wants to keep doing research in the field of polymer nanocomposites at an industrial research center or a university.