Cost Effective Production of Ultra-Strong Polymer Fibers from Extended Chains
超强聚合物纤维链延伸纺丝及低成本工艺
Donggang Yao (姚冬刚)
School of Materials Science & Engineering
Georgia Institute of Technology (佐治亚理工学院), Atlanta, GA, USA
email:yao@gatech.edu
时间：6月21日 13:30 地点：四号学院楼2004
Abstract (摘要):
Gel spinning, also called extended-chain spinning,is known as a special process for making high-strength polymer fibers. However, commercial success has mainly been demonstrated for ultrahigh molecular weight polyethylene. Applying gel spinning to other polymers has so far only received very limited success, and the underlying working mechanism for gel spinning still remains largely unknown. In the past decade, research has been conducted at Georgia Tech towards improved understanding of the gel spinning process and developing technical approaches for enhancing the process efficiency. It now becomes clearer that the so-called‘gel’ material desired in gel spinning is not indeed a classical gel of elastic properties. The effects between gelation and phase separation must be judiciously controlled to achieve a gel-like material that is highlyextendable. With the new knowledge applied to processing, the process economics has been significantly improved and more polymers have been successfully gel-spun into high-strength fibers. In particular, an environmentally benign process – twist-gel spinning process – was invented to enhance the productivity of gel spinning, and the new process was successfully used to makeultra-strong fibers with improved economics. The new process was also successfully applied to several other polymers that cannot be gel spun previously, includingpolyethylene oxide and polyoxymethylene, to produce ultra-strong polymer fibers.
Bio Sketch (简历):
Donggang Yao, Professor in the School of Materials Sci. & Eng. at Georgia Institute of Technology, received a BS degree in Precision Instruments from Shanghai Jiao Tong University in 1991 and MS and Ph.D. degrees in Mechanical Engineering from University of Massachusetts Amherst in 1998 and 2001.He teaches and directs research in the broad area of polymer engineering. His ongoing research deals with composites processing, ultra-strong fiber processing, polymer precision molding, constitutive modeling, and process modeling. His work in polymer processing has resulted in about 200 publications in journals and conference proceedings. He was a recipient of the National Science Foundation Career Award in 2003. He served as the Chair for the Textile & Composites Committee of the ASME Manufacturing Division from 2009 to 2011 and theChair of the Polymer and Soft Materials Committee for the ASME Materials Division from 2014 to 2016. He is also an associate editor for ASME Journal of Manufacturing Science & Engineering and serves in the advisory board for Polymer Engineering & Science.