The effect of initiator and weight ratio on dynamic-mechanical properties of multilayer latex IPN with core/shell morphology

Document Type : Research Paper


Composite Research Center, Malek Ashtar University of Technology, Tehran, Iran


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.

Graphical Abstract

The effect of initiator and weight ratio on dynamic-mechanical properties of multilayer latex IPN with core/shell morphology


  • Interpenetrating polymer networks with core/shell morphology confirm their high damping capacity (tanδ > 0.3 and damping temperature range > 100°C).
  • The IPN core/shell latex particles with a thermal initiator exhibited the best damping properties.
  • By changing the weight ratio of the layers and the amount of PBA in the last layer, the effective damping range increases.


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Volume 7, Issue 1
May 2021
Pages 33-39
  • Receive Date: 15 December 2020
  • Revise Date: 22 February 2022
  • Accept Date: 10 March 2022
  • First Publish Date: 10 March 2022