2003 Fiscal Year Final Research Report Summary
Restructuring of Phase Structure and Low Frequency Sound Absorption Properties in Fiber Reinforced Organic Hybrid Dampers
| Project/Area Number |
13450276
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Composite materials/Physical properties
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
SUMITA Masao Tokyo Institute of Technology, Graduate School of Science and Engineering, Professor, 大学院・理工学研究科, 教授 (30016654)
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| Co-Investigator(Kenkyū-buntansha) |
TOMINAGA Yoichi Tokyo Institute of Technology, Graduate School of Science and Engineering, Assistant Professor, 大学院・理工学研究科, 助手 (30323786)
ASAI Shigeo Tokyo Institute of Technology, Graduate School of Science and Engineering, Associate Professor, 大学院・理工学研究科, 助教授 (80212463)
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| Project Period (FY) |
2001 – 2003
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| Keywords | organic hybrid / damping materials / low frequency noise / sound absorption / miscible blend / domain formation / loss modulus / loss tangent |
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| Research Abstract |
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.
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