Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Polyester


A Study of Some Mechanical and Physical Properties for Palm Fiber/Polyester Composite

Samah M. Hussein

Engineering and Technology Journal, 2020, Volume 38, Issue 3B, Pages 104-114
DOI: 10.30684/etj.v38i3B.598

This research has been done by reinforcing the matrix (unsaturated polyester) resin with natural material (date palm fiber (DPF)). The fibers were exposure to alkali treatment before reinforcement. The samples have been prepared by using hand lay-up technique with fiber volume fraction of (10%, 20% and 30%). After preparation of the mechanical and physical properties have been studied such as, compression, flexural, impact strength, thermal conductivity, Dielectric constant and dielectric strength. The polyester composite reinforced with date palm fiber at volume fraction (10% and 20%) has good mechanical properties rather than pure unsaturated polyester material, while the composite reinforced with 30% Vf present poor mechanical properties. Thermal conductivity results indicated insulator composite behavior. The effect of present fiber polar group induces of decreasing in dielectric strength, and increasing dielectric constant. The reinforcement composite 20% Vf showed the best results in mechanical, thermal and electrical properties.

Recycling of Sewage Sludge Ash in Polymer Structures

Mohamad Alsaadi; Aseel B. Al-Zubaidi; Mukhallad Haider; Hasanain Hashim

Engineering and Technology Journal, 2019, Volume 37, Issue 3C, Pages 311-318
DOI: 10.30684/etj.37.3C.2

In this study sewage sludge ash (SSA) particles were used as filler in the polyester resin to fabricate particulate composites with various filler contents of 0, 1, 2, 3, 4, 5, 6 and 7 wt%. The tensile, flexural, impact, hardness, chemical composition and scanning electron microscope tests wear done on the samples in accordance with ASTM standards. The results were improved at the particle content of 5 wt% for the tensile and flexural strength and then showed reducing trend with extra particle addition. Tensile and flexural modulus values of the particulate polyester composites significantly enhanced compared with the unfilled polyester composite. Energy Dispersion Spectrometry (EDS) results showed that the SSA contains elements and oxides which may increase adhesion force with polymer. In spite of the particle content of SSA that used with polymer to produce various structures for different applications was low, this study approved that using of SSA can protect the environment due to increasing the amount of SSA can affect the environment badly in addition to produce cheaper polymer composite for industrial applications.

Numerically and Experimentally Studying of some Mechanical Properties of the Polyester Matrix Composite Material Reinforced by Jute Fibers

Jawad Kadhim Oleiwi; Mohamad K. Alwan; Qahtan Adnan Hamad

Engineering and Technology Journal, 2014, Volume 32, Issue 9, Pages 2235-2247

This research focuses on the preparation of polymer matrix composite material by (hand lay – up) method, where the material (rectangular beam) was prepared from unsaturated polyester resin as a matrix reinforced by natural jute fiber with different volume fraction (3%, 4%, 5%, 6%).
Numerical studies by using finite element method (Ansys 11 package) to study the effect of selected volume fractions of jute fibers on the bending properties.
Results of this experimental research indicate that increasing the volume fraction of jute fibers lead to increase bending modulus of elasticity.
The values of flexural strength and shear stress increase with the increase of jute fibers volume fraction while the values of deflection and maximum strain decreases for both experimental and numerical studies.

Studying the Effect of Aluminum Powder Addition on Dielectric Behavior of Polyester Composite Materials

Nirvana A. Abd Alameer; Shayma. H. Mohammad

Engineering and Technology Journal, 2013, Volume 31, Issue 7, Pages 1388-1394

The effect of both weight fraction of aluminium and frequency on dielectric properties of Al- powder reinforced polyester composite materials were investigated. We study the dielectric behaviour of composite materials reinforced with (0, 5, 15, 30 &45) weight fraction of Al and frequency ranges (50-106) Hz at room temperature. The results show the dielectric constant and dielectric losses factor were increased with increasing in weight fraction of aluminium due to high conductivity of aluminium. The decrease in the dielectric constant and dielectric losses with higher frequencies can be explained by the fact that as the frequency increases, the interfacial dipoles have less time to orient themselves in the direction of the alternating field.

Studying Mechanical Properties For Polymer Matrix Composite Material Reinforced By Fibers And Particles

Engineering and Technology Journal, 2010, Volume 28, Issue 4, Pages 81-93

The work focuses on the preparation of hybrid polymer matrix composite
materials prepared from the unsaturated polyester resin as matrix reinforced by woven
glass fiber kind ( E-glass ) and graphite particles as first group of samples and the second
group of samples reinforced with woven Kevlar fiber kind (49) instead of glass fiber.
This work includes studying the effect of selected volume fractions ( 0% , 5% , 10% ,
15% , 20% ) of graphite particles with mixture of different particle Size of ( 25 μm – 106
μm ) on the properties of the prepared composite materials, Number of mechanical tests
were done,they include (Tensile, Compression, Impact, Flexural Strength, Shear Stress
and Hardness), which done at room temperature Result of the work shows that the
values of (Tensile stress, Tensile elastic modulus, Fracture Toughness, Hardness)
increase with the increase of graphite particle volume fraction for both groups samples.
As well as the values of the (Compression elastic modulus, Flexural strength, Shear
stress) increase with the increase of low values of graphite particles volume fraction for
both groups of samples. Where as the values of Impact strength of the prepared
composite material decreased with the increases of volume fraction of graphite particles
for both group samples. As well the result shows that the values (Tensile stress, Tensile
elastic modulus, impact strength, Fracture toughness) for hybrid composite materials
reinforced by Kevlar fiber are higher than values reinforced by glass fiber instead of
Kevlar fiber, While the values of (Compression stress, Flexural Strength, Shear stress,
Hardness) for hybrid composite materials reinforced by glass fiber are higher than values
reinforced by Kevlar fiber instead of glass fiber.