Paper Title :Creation of an Optimal Polymer Nan Composite for use in Parallel Environmental Noise Barriers
Author :Mahdiyeh Naderzadeh, Mohammad Reza Monazzam, Ismaeil Ghasemi, Hossein Arabalibeik
Article Citation :Mahdiyeh Naderzadeh ,Mohammad Reza Monazzam ,Ismaeil Ghasemi ,Hossein Arabalibeik ,
(2017 ) " Creation of an Optimal Polymer Nan Composite for use in Parallel Environmental Noise Barriers " ,
International Journal of Advances in Science, Engineering and Technology(IJASEAT) ,
pp. 31-36,
Volume-5, Issue-4, Spl. Iss-2
Abstract : In recent years, following the use of parallel noise barriers in control of urban noise pollution, acoustic engineers
have made their attempts to create an optimal material based on nano-composites as a Sound-absorbing material. They can
be used in the structure of parallel noise barriers in order to reduce multiple reflections. Accordingly, the present study was
performed to create an optimized absorber transparent polycarbonate/poly methacrylate-based polymer nanocomposite in
parallel environmental noise barriers in order to reduce multiple reflections. For this purpose, a twin-screw extruder was
used to mix 0.3 wt% SiO2, ZnO, and TiO2 nanoparticles with pc and PMMA polymers.Scanning electron microscopy (SEM)
was used to study the surface morphology of thenanocomposites. In order to test the sound absorption coefficient of the
specimens, Two-microphone impedance tube was used. Finally, due to optimize the acoustic properties of the specimens and
to reduce any surface defects caused by molding, the surface was roughed by sand blasting machine. Mechanical properties
were characterized by tensile, flexural strength, izodimpact, and Shore hardness tests. The transparency of the nanocomposites
was checked by UV-vis spectroscopy. The morphology results described dispersion of the nano-particles in the
polymer matrix. The obtained results showed that the pcsi3-r nano-composite, compared to the other specimens, had the
highest acoustic absorption coefficient at the middle frequencies of 500 Hz. According to the tensile modulus and hardness
test results, the mean tensile modulus and hardness of the nano-composites was higher than that in pure polymers. Also, the
flexural modulus of nanocomposites was always higher than the net PC and PMMA, except for the pczn3 specimen. The
transparency test results showed that adding nanoparticles to the PC and PMMA matrix considerably decreased the
transparency of the specimens, compared to the pure polymers.In conclusion, adding 0.3 wt% of nanoparticles to the
polycarbonate and poly methyl methacrylate-based matrix and roughening the rigid surface of the specimens increased the
mechanical properties and also sound absorption coefficient in the middle frequencies.
Keywords - Nanocomposites, Environmental Noise Barriers, Absorption Coefficient, Transparency, Mechanical
Characteristics
Type : Research paper
Published : Volume-5, Issue-4, Spl. Iss-2
DOIONLINE NO - IJASEAT-IRAJ-DOIONLINE-10490
View Here
Copyright: © Institute of Research and Journals
|
|
| |
|
PDF |
| |
Viewed - 29 |
| |
Published on 2018-02-12 |
|