1 The Effects of PEG-Based Surface Modification of PDMS Microchannels on Long-Term Hemocompatibility Kyle M. Kovach, a Jeffrey R. Capadona, a,b Anirban Sen Gupta, b and Joseph A. Potkay* c,d a Advanced Platform Technology Center (APT Center), Louis Stokes Cleveland VA Medical Center, Cleveland, OH 44106, USA. b Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA. c VA Ann Arbor Healthcare System, Ann Arbor, MI 48105, USA. d Department of Electrical Engineering and Computer Science, Case Western Reserve University, Cleveland, OH 44106, USA. * Corresponding author. VA Ann Arbor Healthcare System, Research Service (151), 2215 Fuller Rd., Ann Arbor, MI 48105, USA. phone: 1-734- 845-3318. e-mail: jap65@case.edu