Properties of Acrylic Rubber/Organic Filler Hybrid Damping Materials

The damping behavior of organic hybrids prepared from acrylic rubber(AR) and the functional organic filler were investigated. 4, 4', -Thio-bis (3-methyl-6-tert-butylphenol) (F1) and Pentaerythritol tetrakis [3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionate] (F2) were used as the functional organic molecules. DSC and DMA indicate the miscibility between AR and organic fillers, since these hybrids have a single glass-transition temperature. With increasing filler content, the height of tan δ peak increases accompanying a shift of the peak position to the higher temperature. It was found that Kwei's equation can well describe the DSC result, and the parameter q was calculated to be 46 for AR/F1 and-15 for AR/F2. These results suggested that the AR-F1 interaction is much stronger than the AR-F2. FT-IR study further confirmed that there is a strong hydrogen bond between AR and F1. As a result, the stability of damping properties for AR/F1 is quite good, whereas for AR/F2, it is poor due to a gradual crystallization of F2 in AR matrix.