Synthesis and investigation of dynamic-mechanical properties of polystyrene, poly methyl methacrylate and poly buthyl acrylate IPNs with core/shell morphology

Document Type : Research Article

Author

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

amnc.2021.9.35.6

Abstract

Hypothesis: The basis of damping in polymers is the absorption of mechanical energy in the form of heat. When a polymer is exposed to vibration at the right temperature and frequency, the molecular vibrational energy is converted to heat and a dissipation peak appears within its glass transition region. Synthesis of core / shell latex particles with a specific morphology and using interpenetrating polymer networks in the core and shell sections is one of the best ways to expand the damping range. The aim of this study is to synthesize and investigate the dynamic-mechanical properties of interpenetrating polymer networks with core / shell morphology.
Methods: For this purpose, poly (styrene-methyl methacrylate-butyl acrylate) multilayer core/shell particles were fabricated by semi-continuous emulsion polymerization The formation of the structures was examined by FTIR . The arrangement of the layers was designed by varying the weight ratio of the monomers in each layer so that the glass transition temperature gradually decreased from the core to the shell and investigation of the particle size by DLS confirmed the uniform distribution in the nano scale. The amount of cross linker, reduction of reaction temperature and the weight ratio of the layers on the dynamic-mechanical properties were investigated.
Finding: The results showed that the three-layer core/shell particles at 75ºC with the optimal amount of crosslinking agent and weight ratio of 1:2:3 provide the widest effective damping range from -26ºC to 147ºC.

Keywords

References

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