مرکز منطقه ای اطلاع رساني علوم و فناوري -

چكيده لاتين :

Several novel organic hybrid systems based on carboxylated nitrile rubber (XNBR) were prepared. The damping properties of organic hybrids consisting of XNBR, 2,2י-methylenebis(6-t-butyl-4-methylphenol) (AO-2246), and pentaerythrityl- tetrakis-[â(3,5-di-t-butyl-4-hydroxyphenyl)-propionate] (AO-1010) were investigated by dynamic mechanical analysis (DMA). Binary XNBR/AO-2246 system was compatible and showed only one damping peak associated with XNBR, whereas binary XNBR/AO-1010 system was partially compatible and a new damping peak appeared besides that of XNBR. FTIR measurements and SEM observation were carried out to clarify the molecular mechanism of the different additive effects of AO-2246 and AO-1010. DMA results of ternary XNBR/AO-2246/AO-1010 systems showed that the addition of a small amount of AO-1010 into XNBR/AO-2246 further enhanced the damping peak height and peak temperature remarkably, demonstrating that combined AO-2246 and AO-1010 had a synergistic effect on improving the damping property of XNBR. Furthermore, studies on the damping stability of such organic hybrids during ageing and annealing process revealed that the addition of small amount of AO-1010 into XNBR/AO-2246 obstructed the crystallization behaviour of AO-2246 and finally improved the damping stability. Thus, a series of XNBR-based high-performance damping materials with high damping peak and controllable peak position as well as better damping stability were obtained.