S1 Supporting Information Stabilization study of polyacrylonitrile/cellulose nanocrystals composite fibers Huibin Chang a, b , Jeffrey Luo a, b , H. Clive Liu a, b , Songlin Zhang c , Jin Gyu Park c , Zhiyong Liang c , and Satish Kumar a, b, * a School of Materials Science and Engineering, Georgia Institute of Technology, 801 Ferst Dr. NW, Atlanta, GA, 30332, USA b Renewable Bioproducts Institute, Georgia Institute of Technology, 500 10th Street NW, Atlanta, GA, 30332, USA c High-Performance Materials Institute, Florida State University, 2005 Levy Ave., Tallahassee, FL 32310, USA * Corresponding author: Email: Satish.Kumar@mse.gatech.edu