Abstract
In this study we use vapor deposition to incorporate carbon nanotubes (CNTs) and silicon dioxide nanopowder (nanosilica) in Polyurethane (PU) as well as to engineer Parylene C (PC) in a microfibrous thin film (µFTF) and bulk forms in an attempt to examine acoustic absorption and transmission properties in the low frequency (50 to 200 Hz) range. Incorporating CNTs or/and nanosilica into PU significantly increases its acoustic transmission, presumably due to increased rigidity caused by nanoparticle (CNTs and nanosilica) addition. This is explained as due to adding nanosilica or/and CNTs to PU increases its rigidity and, hence, its sound transmission. On the other hand, engineering the PC in the µFTF form enhances acoustic absorption in the film, especially at the resonant frequencies associated with oscillations of the microfibers making up the PC µFTF.
Highlights
Parylene C (PC), a polymer material with molecular form -(C8H7Cl)n, was first developed in 1947 [1]
We find that adding silicon oxide nanopowder or/and carbon nanotubes (CNTs) to PU significantly changes its sound transmission characteristics
The experiments showed that addition of up to 1% weight ratio silica nano-powder and up to 2% weight ratio of carbon nanotubes to polyurethane composition improved sound transmissions loss by up to 50% than that of pure polyurethane foam sample
Summary
Parylene C (PC), a polymer material with molecular form -(C8H7Cl)n-, was first developed in 1947 [1]. It has been in use as protective insulation-coatings in medical devices and electronic appliances as well as substrates for the growth and proliferation of biological cells [2,3,4]. Polyurethane (PU) is another polymer, which finds a number of uses in everyday life and applications. It is composed of organic units joined by urethane [-NH-(C=O)-O] links [10]. A number of studies have been undertaken to examine the use of nanoclay [12], titania nanoparticles [13,14] carbon nanotubes (CNTs) reinforced PU to modulate its sound absorption properties
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