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Sound attenuation in composite friction materials containing thermoplastic elastomers
Author(s) -
Masoomi M.,
Katbab A. A.,
Nazockdast H.
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.23434
Subject(s) - materials science , composite material , elastomer , viscoelasticity , thermoplastic elastomer , natural rubber , polyvinyl chloride , attenuation , dynamic mechanical analysis , acoustic attenuation , loss factor , composite number , polymer , copolymer , physics , optoelectronics , dielectric , optics
Attempts have been made for the first time to modify and improve the sound attenuation ability of a friction material by the inclusion of combined plastic/rubber properties of thermoplastic elastomers (TPE) as viscoelastic polymeric materials, into the formulation. To evaluate the attenuation coefficient (α) and also the real part wave number ( k ′) for the friction material, the viscoelastic parameters such as loss factor (tan δ) and elastic modulus ( E ′) were measured by the use of dynamic mechanical analyzer (DMA). Styrene‐butadiene‐styrene (SBS), styrene‐ethylene‐butylene‐styrene (SEBS) and nitrile rubber/polyvinyl chloride (NBR/PVC) blend system were used as TPE materials. However, SEBS and NBR/PVC were found to be much more effective in reducing the sound propagating speed as well as the sound level. All the friction materials containing TPEs exhibited more sound damping behavior at a wide range of temperature compared with the reference sample. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 2187–2194, 2006