We use inorganic nanoparticles grafted with polymers as membranes for gas separation. These membranes show remarkable enhancement in permeability as compared to the bulk polymers. Using such a template will enable the use of polymers that were not feasible for commercial applications, since this method solves some of the conventional problems - aging of the polymers (and a corresponding decrease in permeability) and increases mechanical strength. What we do not know is how the local dynamics of the polymers affect the gas permeation process and the unique stress response of the system. The key objectives of this proposal are - Understand how local polymer dynamics are manifested in the system. Understand the link between enhanced gas transport and dynamics. This experiment will enable us to understand the mechanism of gas transport and how to design better materials in the future.