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Intellectual Merit

Melt Processible Polyacrylonitrile Copolymers James E. McGrath, Virginia Polytechnic Institute and State University, DMR 1006630.

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Intellectual Merit

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  1. Melt Processible Polyacrylonitrile CopolymersJames E. McGrath, Virginia Polytechnic Institute and State University, DMR 1006630 This is suggested to also be the mechanism for the earlier reported water plasticization. However the higher boiling liquid glycerin enables thermal analysis to confirm alteration of the pseudo-crystalline morphology. VT is preparing a detailed manuscript which will shortly be submitted to Chemistry of Materials. Intellectual Merit This DMR project is exploring the synthesis of acrylonitrile/methyl acrylate statistical copolymers utilizing classical emulsion, suspension, and RAFT controlled/living copolymerization methods. The RAFT process has been further developed via solution reactions in DMSO. Very narrow molecular weight distributions have been obtained relative to traditional methodology. The goal has been to demonstrate the feasability of melt processing and it’s application to low permeability films and strong fibers. VT has explored a number of variables. Appropriate stable melt viscosities were achieved as illustrated. Fibers have been drawn from the melt and compression molded films have been achieved as shown.VT has also demonstrated the utility of glycerin as an additive which reduces the Tm and heat of fusion without major changes in the Tg. FTIR on these blends suggests a strong specific interaction between the hydroxyl and nitrile groups which disrupts the lateral order produced by the nitrile dipoles.

  2. Melt Processible Polyacrylonitrile CopolymersJames E. McGrath, Virginia Polytechnic Institute and State University, DMR 1006630 Broader Impacts and Accomplishments: Current Year • The principal contributors to the program this year have been Ph.D. candidates Priya Pisipati, Susan Beck, undergraduates Devon Baker, Justin Ryan (not shown), Matt Joseph, and Research Scientist Dr. Sue Mecham. • There are many applications using high AN content polyacrylonitrile copolymers, which are currently all processed from solutions. Solvent-free melt processing is both more economical and environmentally-sound. • Carbon Fibers derived from AN copolymers are integral for high performance polymer matrix composites in aerospace, automotive and consumer products such as tennis rackets. • Acrylic textiles are well known as suitable wool substitutes which have good light and chemical stability. • Multilayer Laminates could utilize the very low permeability characteristics of AN copolymers. • Membranes for waste water and chemical processings applications are of continued importance. McGrath Research Group July 2012 Back Row: Ben Sundell, Lun Hai, Devon Baker, Jarrett Rowlett, Kyle Gaines, Ali Nebipasagil, Priya Pisipati, Ozma Lane, Ishan Mehta, Andy Shaver Front Row: Matt Joseph, Yu Chen, Jim McGrath, DongHoon Lee, Sue Mecham, Susan Beck

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