Iranian Research Organization for Science and Technology Journal of Particle Science and Technology 2423-4087 7 1 2021 05 01 The effect of initiator and weight ratio on dynamic-mechanical properties of multilayer latex IPN with core/shell morphology 33 39 1135 10.22104/jpst.2022.4577.1177 EN Seyedeh Maedeh Azadeh Ghahfarokhi Composite Research Center, Malek Ashtar University of Technology, Tehran, Iran Iraj Amiri Amraei Composite Research Center, Malek Ashtar University of Technology, Tehran, Iran Journal Article 2020 12 15 Polymers have good dynamic mechanical properties and high damping capacity due to their viscoelastic nature, especially in the glass transition range, and are considered a good damper with a loss factor greater than 0.3 and a peak temperature range of at least 60-80ºC. Two of the best ways to expand the damping range are fabricating the core/shell latex particles with a specific morphology and using interpenetrating polymer networks in the core and shell sections. The aim of this study is to synthesize and investigate the dynamic-mechanical properties of interpenetrating polymer networks with core/shell morphology. A set of multilayer core/shell/shell latex particles with styrene-acrylic monomers were synthesized by varying the initiator (thermal initiator and redox initiator) via semi-continuous emulsion polymerization. In this study, synthesized particles were characterized with fourier transform infrared (FT-IR) spectroscopy, the morphology was determined by transfer electron microscopy (TEM), and the size and size distribution were investigated via dynamic laser scattering (DLS), which represent nano-scale particles with narrow distribution. The damping properties of the formed films were studied by dynamic mechanical analysis (DMA). The factors affecting the formation of poly(styrene/methyl methacrylate/butyl acrylate)-based core/shell particles, including the type of initiator and layer mass ratio, were discussed. The results showed that the IPN core/shell latex particles with a thermal initiator exhibited the best damping properties, with a broad effective damping range (tanδ > 0.3). The influence of the layer mass ratio on damping was also explored in this work. https://jpst.irost.ir/article_1135_fd2c5e4680d9a01dba3aada5ece22270.pdf