Restructuring of Phase Structure and Low Frequency Sound Absorption Properties in Fiber Reinforced Organic Hybrid Dampers

丙烯酸橡胶（AR）和4，4 '-硫代双（3-甲基-6-叔丁基苯酚）（TMBP）组成的有机混杂物是可混溶的共混型阻尼器，氯化聚乙烯（CPE）和N，N'-二环己基-2-苯并噻唑亚磺酰胺（DBS）的混杂物是畴形成型阻尼器。在AR/TMBP体系中，当TMBP用量为0 ~ 200份时，损耗角正切值增加到2.5 ~ 6.0。在此负载范围内，AR/TMBP的Tg增加到-20℃至40℃。这些事实表明，TMBP的负载含量控制频率和温度的阻尼效率。添加3wt%的气相生长碳纤维到该混合物中将模量增加到300%而不降低损耗角正切。在CPE/DBS有机杂化材料中，随着DBS含量的增加，CPE/DBS的损耗模量和损耗角正切迅速增加，形成了富含DBS的结构域。从正常入射声吸收系数的测量，在50℃退火一周后，在350 Hz和1100 Hz附近出现新的吸声峰。DSC和广角X-射线衍射结果表明，低熔点的小晶粒和/或无序晶粒是导致低频吸声峰的主要因素。

Organic hybrid consisted of acrylic rubber (AR) and 4,4'-Thio-bis(3-methyl-6-tert-butylphenol) (TMBP) is miscible blend type damper and hybrid from chlorinated polyethylene (CPE) and N, N'-dicyclohexyl-2-benzothiazolylsulfenamide (DBS) is domain formation type damper. In AR/TMBP, loss tangent increases to 2.5〜6.0 by loading TMBP 0〜200phr. Tg of AR/TMBP increases to -20℃〜40℃ in this loading range. These facts show that damping efficiency in frequency and temperature is controlled by loading content of TMBP. Adding 3wt% vapor growth carbon fiber to this hybrid increases modulus to 300% without decreasing loss tangent. In CPE/DBS organic hybrids, loss modulus and loss tangent of CPE/DBS increase rapidly by formation of DBS rich domains accompanied by increasing DBS contents. From a normal incident sound absorption coefficient measurement, new sound absorption peaks appeared around 350Hz and 1100Hz by annealing at 50℃ for a week. As results from DSC and wide-angle x-ray diffraction, the small and/or disordered ciystals with a lower melting point is considered to be a major factor for the low frequency sound absorption peak.