A Study on Mechanical Properties of PMMA/Hydroxyapatite Nanocomposite

Abstract

This study is focused on the role of nano hydroxyapatite particles on the mechanical properties of PMMA/HA nanocomposites. In order to achieve a proper and homogeneous distribution of HA particles in the polymer matrix, mixer milling process was applied. Wear, compression and three-point bending tests were conducted. It was observed that wear rate decreased by increasing in HA content in both atmosphere and artificial saliva. The results of compression tests showed that the addition of 2.5 percent HA to PMMA promoted ultimate compressive strength, yield strength and modulus while caused to decrease elongation at break. Also it was elucidated that addition of HA more than 2.5 wt.% caused a decrease in both ultimate compressive strength and compression yield strength and an increase in elongation at break. The results of three-point bending tests on the PMMA cements containing 2.5 percent HA demonstrated the maximum bending strength value and modulus among all the HA containing formulations. However there was no direct proportionality between the results of bending tests and the HA content and the addition of HA to PMMA (up to 10 wt.%) did not change the bending properties significantly

Ionogel-based solid-state supercapacitor operating over a wide range of temperature

“…2 shows the load as a function of the penetration depth plot for a 1.5 mm-thick ionogel pellet using a Berkovitch indenter. Ionogels exhibit rather low values of both Vickers Hardness (0.11 AE 0.02 MPa) and elastic modulus (0.935 AE 0.114 MPa) as compared to other gel electrolytes: 26 MPa for PMMA [22] and 35-50 MPa for PVdF-based polymer [23]. The elastic contribution to the loading can be obtained from Fig.…”

The Effect of 3d Printing Machine Parameters in Extrusion Process of Biocomposite Materials (Pmma and Ha) on Dimensional Accuracy

“…At the time of drying, the size of the specimen will decrease due to shrinkage. It is one of the properties of PMMA and HA composites (Zebarjad et al, 2011). Some of the dried specimens are shown in Fig.…”

“…(Puska et al, 2011). The most widely used materials as bone cement in recent years are polymethylmethacrylate or PMMA based composites (Puska et al, 2011 andZebarjad et al, 2011). Pure PMMA has limited mechanical properties, less compatible, rigid, and nonbioactive (Zebarjad et al, 2011).…”

“…The most widely used materials as bone cement in recent years are polymethylmethacrylate or PMMA based composites (Puska et al, 2011 andZebarjad et al, 2011). Pure PMMA has limited mechanical properties, less compatible, rigid, and nonbioactive (Zebarjad et al, 2011). To improve bioactivity, PMMA-based cement is combined with inorganic substances, such as bioactive hydroxyapatite (HA) (Puska et al, 2011).…”

Factorial Design Applied for Evaluation of Effect of Interactions among Precursors on the Thermal Decomposition Temperature of Montmorillonite/Poly(Methyl Methacrylate) Nanocomposites

“…8,11,12 Thus, several kinds of polymerization processes can be employed, as in situ, by solution, by emulsion and by suspension. 13 Poly(methyl methacrylate) (PMMA) is a widely employed polymer of methacrylate class that presents as main characteristics its transparency (light transmission rate of 92%), 14,15 good resistance to electricity, corrosion and atmospheric agents, [16][17][18] glass-like aspect and easy processability. 19,20 As a drawback, polymeric materials as PMMA presents low thermal resistance, which makes necessary the addition of ceramic materials, as clays, to increase the thermal stability when some applications are targeted.…”