The paper written by Prof. W. –J. Wang et al. has been published as cover in < Macromolecular Materials and Engineering >

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The paper “Design and Synthesis of Poly(butyl acrylate) Networks through RAFT Polymerization with Crosslinking for Controlled-Release Applications” written by Prof. W. –J. Wang et al. has been published as cover paper by <Macromolecular Materials and Engineering> in Issue 4, 2013.

An effective approach is presented for designing and tailoring diffusion-controlled systems for targeted release rate profiles. The diffusion-controlled system consists of PBA networks with precisely controlled crosslink densities via RAFT copolymerization of BA with ethylene glycol dimethacrylate, which gives a desired diffusivity. One-dimensional releases in the crosslinked PBA matrix (CPM) slabs are evaluated with a hydrophobic dye. Fick’s second law is used to model the transient mass transfers in the CPMs with a mixed Newton-Tikhonov regularization method for determination of their diffusion coefficients. A two-layer CPM (CPM-2) with controlled crosslink densities is constructed. The dye release results from the CPM-2 agreed well with theoretical predictions.