Due to its performance, the importance of interpenetrating polymer networks (IPN's) has increased in recent years. If a composition gradient is included in the IPN, the expected gradient in properties expands the field of applications of multicomponent polymer systems. In this work, IPN's with and without gradient composition were prepared by photopolymerization using styrene and butyl acrylate as monomers one and two, respectively. Uniaxial creep measurements showed the superiority of the gradient material. SEM studies at different depths in the samples, allowed to observe domain sizes in the dispersed phase, and how the morphology gradient vary within a sample
