“…polymer composites) plays an important role in many branches of science and engineering. Examples of applications where moisture and/or ion diffusion plays an important role are, amongst many others, pigmented coating layers [1], optical silicones filled with phosphor particles for LED lighting [2], or highly-filled epoxies used to encapsulate microelectronic devices [3]. In general, the addition of fillers will affect the overall diffusivity of the polymer, as the fillers may have transport properties different compared to the matrix.…”