Molecular Motion Below the Glass Transition: A Solid‐State NMR Study of Siloxane Polymer Dynamics
Molecular mobility below the glass transition temperature ( T g ) governs physical aging, mechanical relaxation, and long‐term stability in polymer glasses, yet remains difficult to quantify with chemical and timescale specificity. We use solid‐state NMR relaxometry to probe sub‐ T g dynamics in a sequence‐ a...