Studies on the damping properties of polyacrylate emulsion/hindered phenol hybrids

Abstract

Organic hybrids of polyacrylate emulsion (PAE)/hindered phenol (3,5-bis(1,1-dimethylethyl)-4-hydroxybenzenepropanoic acid thiodi-2,1-ethanediyl ester, abbreviated as Irganox-1035) have been prepared in this study. The dynamic mechanical properties, denoted by storage modulus (E′) and loss factor (tanδ), of this binary system have been investigated. Dynamic mechanical analysis (DMA) results show that by adding Irganox-1035, the tanδ peak maximum of the hybrids are remarkably increased up to 4.2, demonstrating PAE/Irganox-1035 hybrids are promising damping materials. The damping mechanism of the hybrids has also been systematically investigated through Fourier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC), X-ray diffraction (XRD), DMA and scanning electronic microscope (SEM). The experimental results indicate no hydrogen bonding is formed between polyacrylate matrix and Irganox-1035 molecules and PAE has a good compatibility with Irganox-1035 existing in the amorphous form in the hybrids. Meanwhile, DMA results show amorphous Irganox-1035 has a super-high viscoelastic property (tanδ = 20.7), which improves the damping performance of this compatible hybrids system. © 2012 The Society of Polymer Science, Japan (SPSJ) All rights reserved.