MODELING MOISTURE DIFFUSION BEHAVIORS IN POLYMERS AND POLYMER COMPOSITES A Dissertation by YIMING FAN Submitted to the Office of Graduate and Professional Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Chair of Committee, Anastasia Muliana Committee Members, Alan Freed Sevan Goenezen Maryam Sakhaeifar Head of Department, Andreas A. Polycarpou August 2018 Major Subject: Mechanical Engineering Copyright 2018 Yiming Fan