American Journal of Scientific Research ISSN 1450-223X Issue 36(2011), pp. 107-111 © EuroJournals Publishing, Inc. 2011 http://www.eurojournals.com/ajsr.htm
Study of Mechanical Properties of (PVA- TiO2, BaSO4.5H2O) Composites Alaa J. Kadham Algidsawi Babylon University, College of Agriculture, Department of Soil and Water, Iraq E-mail: alaa,
[email protected] Tel: +964-7813601633 Ahmed Hashim Babylon University, College of Science, Department of physics, Iraq Hayder J. Kadham Algidsawi Babylon University, College of Agriculture, Department of Soil and Water, Iraq Abstract Composites consisting of an polyvinyl alcohol as matrix and TiO2,BaSO4.5H2O as a filler has been investigated with different percentages of TiO2,BaSO4.5H2O (0,5,10,15 and 20) wt.%.. The Results show that the Velocity of Ultrasonic wave, Specific Acoustic Impedance, Bulk Modulus and Compressibility change with increase the concentration of fillers.
Keywords: Mechanical properties, Composites,Titanium oxide.
1. Introduction A composite material is a material in which two or more distinct materials are combined together but remain uniquely identifiable in the mixture. They are keys to various applications that range from packaging to aerospace transportation which, depending on the chosen materials. But there have limited number of studies that provides each filler with its reinforcement effects in each matrix system. Ceramic filler, was incorporated into the thermoplastic polymer to improve the mechanical properties. Its high hardness, excellent dielectric properties, refractoriness and good thermal properties make it the material of choice for a wide range of applications. Composite materials can in service be subject to a wide variety of different loading conditions. The most important conditions are mechanical stress and environmental effects. Before to use composite material in structural components, their behaviour under various conditions has to be studied[1,2]. This paper deals with the effect of TiO2 and BaSO4.5H2O additive on the mechanical properties of poly-vinyl alcohol composite.
2. Experimental Work The materials used in this work are polyvinyl alcohol as matrix and TiO2, BaSO4.5H2O as fillers. The weight percentages of TiO2 and BaSO4.5H2O are ( 0,5,10,15 and 20) wt.%. The casting technique is used to prepare the samples with thickness ranged between (200-730)µm. The mechanical properties is measured by Ultrasonic Velocity System Measurement.
Study of Mechanical Properties of (PVA- TiO2, BaSO4.5H2O) Composites
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3. Results and Discussion The variation the velocity of Ultrasonic wave(V), Specific Acoustic Impedance (Z= ρV) where ρ is density ), Compressibility (B = (ρV2)-1) and Bulk Modulus (K = B-1 = ρ V2) with concentration of TiO2 and BaSO4.5H2O respectively show in figures(1,2,3,4). The velocity of Ultrasonic wave was calculate using the thickness of sample and delay time. Figure 1: The variation of velocity of Ultrasonic wave with the concentrations of fillers. (a) For (PVA- TiO2) composites. (b) For (PVA-BaSO4.5H2O) composites. 12
10
V(m/Sec)
8
6
4
2
0 0
2
4
6
8
10
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14
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18
20
Con. of TiO2 wt.%
(a) 60 50
V(m/Sec)
40 30 20 10 0 0
2
4
6
8
10
12
14
16
18
20
Con. of BaSO4 .5 H2 O wt.%
(b) Figure 2: The variation of Specific Acoustic Impedance with the concentrations of fillers. (a) For (PVATiO2) composites. (b) For (PVA-BaSO4.5H2O) composites. 25000
20000
Z
15000
10000
5000
0 0
2
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Con. Of TiO2 wt.%
(a)
14
16
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20
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Alaa J. Kadham Algidsawi, Ahmed Hashim and Hayder J. Kadham Algidsawi 120000 100000
Z
80000 60000 40000 20000 0 0
2
4
6
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10
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14
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18
20
Con. Of BaSO4.5H2O wt.%
(b) Figure 3: The variation of Compressibility with the concentrations of fillers. (a) For (PVA- TiO2) composites. (b) For (PVA-BaSO4.5H2O) composites.
B
1.0E-04
1.0E-05
1.0E-06 0
2
4
6
8
10
12
14
16
14
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Con. of TiO2 wt.%
a) 1.0E-04
B
1.0E-05
1.0E-06
1.0E-07 0
2
4
6
8
10
12
Con. of Ba SO4 .5 H2O w t.%
(b)
18
20
Study of Mechanical Properties of (PVA- TiO2, BaSO4.5H2O) Composites
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Figure 4: The variation of the Bulk Modulus with the concentrations of fillers. (a) For (PVA- TiO2) composites. (b) For (PVA-BaSO4.5H2O) composites.
K
1.0E+06
1.0E+05
1.0E+04 0
2
4
6
8
10
12
14
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Con. of TiO2 wt.%
(a) 1.0E+07
K
1.0E+06
1.0E+05
1.0E+04 0
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6
8
10
12
18
20
Con. of BaSO4.5H2O wt.%
(b) The figures show that, the velocity of Ultrasonic wave increases with increasing the concentration of TiO2 and BaSO4.5H2O, this attributed to increase the density of composite. Also, the TiO2 and BaSO4.5H2O particles act as medium to travel the waves. Consequently, Specific Acoustic Impedance and Bulk Modulus are increasing and Compressibility decreases with increase the concentration of TiO2 and BaSO4.5H2O as a result to increase the density of composite [4,5].
4. Conclusions 1. The velocity of Ultrasonic wave increases with increase the TiO2 and BaSO4.5H2O concentrations. 2. The Specific Acoustic Impedance and Bulk Modulus are increasing with increase the TiO2 and BaSO4.5H2O concentrations. 3. The Compressibility decreases with increase the TiO2 and BaSO4.5H2O concentrations.
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Alaa J. Kadham Algidsawi, Ahmed Hashim and Hayder J. Kadham Algidsawi
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