Macromol. Mater. Eng. 4/2013

Cover: An effective approach is reported for designing and tailoring diffusion‐controlled systems through a diffusivity control for targeted release rate profiles. The diffusivity control is achieved via tailoring crosslink densities in polymer networks. Optimized diffusivity profiles for targeted release are estimated from Fick's law and used for constructing the polymer networks. Further details can be found in the article by J. Huang, W.‐J. Wang,* B.‐G. Li, and S. Zhu* on page 391.