scholarly journals Thermal conductivity and diffusion coefficient of polymer blend 80%EP/20%UPE reinforced with sand particles

2018 ◽  
Vol 16 (38) ◽  
pp. 17-25 ◽  
Author(s):  
R. H. Khalaf
Keyword(s):  
Thermal Conductivity ◽  
Diffusion Coefficient ◽  
Polymer Blend ◽  
Unsaturated Polyester ◽  
Matrix Material ◽  
Weight Fraction ◽  
Determine Diffusion Coefficient ◽  
Chemical Solutions ◽  
Sand Particles ◽  
And Diffusion

New polymer blend with enhanced properties was prepared from (80 %) epoxy resin (Ep), (20%) unsaturated polyester resin (UPE) as a matrix material. The as-obtained polymer blend was further reinforced by adding Sand particles of particle size (53 μm) with various weight fraction (5, 10, 15, 20 %). Thermal conductivity and sorption measurements are performed in order to determine diffusion coefficient in different chemical solutions (NaOH, HCl) with concentration (0.3N) after immersion for specific period of time (30 days). The obtained results demonstrate that the addition of sand powder to (80%EP/20%UPE) blend leads to an increase of thermal conductivity, with an optimum/minimum diffusion coefficient in (HCl)/(NaOH), respectively.

scholarly journals Improving Some Mechanical Properties and Thermal conductivity of PMMA Polymer by using Environmental Waste

2021 ◽  
pp. 2188-2196
Author(s):  
Tagreed M. Al-Saadi ◽  
Anaam W. Watan ◽  
Hanaa G. Attiya
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Environmental Problem ◽  
Matrix Material ◽  
Weight Fraction ◽  
Reinforcement Rate ◽  
Mechanical And Thermal Properties ◽  
The Matrix ◽  
Pmma Polymer ◽  
Composite Samples

This study was achieved to satisfy two goals, the first of which is to treat an environmental problem represented by the disposal of date seeds, and the second is the use of these wastes to improve some mechanical and thermal properties of poly methyl methacrylate PMMA through strengthening different proportions of the powder of date seeds. Particles of date seeds were used as a natural strengthening material for PMMA polymer, by mixing the matrix material (resin) with the hardener while still stirring continuously for a period of 10 min. After that, the samples of the reinforced material were prepared by adding the powder of date seeds, which is the reinforcing substance, with different percentages of weight fraction (0, 0.5, 1, 2, 3, 5 wt. %) and a grain size of <75 µm, while continuing to stir (10 min) for a second time. The composite samples were prepared by the Hand-Lay-up method and cut according to the standard ASTM. Thermal conductivity and some mechanical properties, such as impact strength, tensile strength, compressive strength, flexural strength, and hardness, were studied. An improvement was found in all properties at the reinforcement rate of 1-2 wt. %.

Manufacturing of Thermal and Acoustic Insulation From (Polymer Blend/Recycled Natural Fibers)

2020 ◽  
Vol 38 (12A) ◽  
pp. 1801-1807
Author(s):  
Huda M. Khdier ◽  
Ahmed H. Ali ◽  
Wafaa M. Salih
Keyword(s):  
Thermal Conductivity ◽  
Polymer Blend ◽  
Natural Fiber ◽  
Natural Fibers ◽  
Weight Fraction ◽  
Design Criterion ◽  
Sound Insulation ◽  
Hemp Fiber ◽  
Acoustic Insulation ◽  
Composite Samples

These works study the characterization of thermal and acoustic insulation behavior of Polymer Blend/Recycled Natural Fibers. Acoustic insulation is an important property in design criterion in buildings and used to avoid the damage caused by the sounds of the explosion of rockets and bombs. This work is done through reinforcing 80% epoxy resin EP with 20% polycarbonate PC with two different recycled natural fiber RNF (hemp fiber H.F., cornhusk fiber C.H.F) at various weight fractions of (2,4,6) %, the samples, were formed by hand lay-up then the acoustic and thermal insulation tests carried out. The results show that altering both kinds of RNF can improve acoustic insulation. Also, it could be noticed that sound insulation efficiency can improve with increasing RNF weight fraction. Finally, the optimum results got at 6% hemp composite that shows better acoustic insulation than cornhusk composites. The thermal conductivity improved by increasing the fiber weight fraction. The maximum value of thermal conductivity for composite samples with (H.F., C.H.F) fibers at (6% wt) equal to (0.71609W/m. Kº) and (0.73686W/m. Kº), respectively. The composite samples with C.H.F. fibers have slightly higher thermal conductivity value than composite samples with H.F.

scholarly journals Characterization of thermo-physical and hardness properties of unsaturated polyester resin hybrid nano composites Sihama Issa Salih1, Waleed Bdaiwi Salih2, Husam Sakin Hamad2

2018 ◽  
Vol 16 (37) ◽  
pp. 136-148
Author(s):  
Sihama Issa Salih
Keyword(s):  
Thermal Conductivity ◽  
Specific Heat ◽  
Polyester Resin ◽  
Volume Fraction ◽  
Unsaturated Polyester ◽  
Matrix Material ◽  
Hardness Test ◽  
Unsaturated Polyester Resin ◽  
Hybrid Nanoparticles ◽  
Zro2 Nanoparticles

In this work, two groups of nanocomposite material, was prepared from unsaturated polyester resin (UPE), they were prepared by hand lay-up method. The first group was consisting of (UPE) reinforced with individually (ZrO2) nanoparticles with particle size (47.23nm). The second group consists of (UPE) reinforced with hybrid nanoparticles consisting of zirconium oxide and yttrium oxide (70% ZrO2 + 30% Y2O3) with particles size (83.98nm). This study includes the effect of selected volume fraction (0.5%, 1%, 1.5%, 2%, 2.5%, 3%) for both reinforcement nano materials. Experimental investigation was carried out by analyzing the thermo-physical properties like thermal conductivity, thermal diffusivity and specific heat for the polymeric composites samples, as well as the hardness test. The results showed that the values of (hardness, specific heat) increased as the nanoparticle content in composite samples increased for both groups’ nanocomposites, whereas the values of thermal conductivity and thermal diffusion decrease for both groups composites. And it was found that the properties of composite materials reinforced by hybrid nanoparticles have higher properties as compared with their counterparts of other nanocomposite reinforced by zirconia nanoparticle. The morphology of the fracture surface was showed homogeneous micro structure formation for both groups composites, indicating a good compatibility between the matrix material and the reinforcement nanoparticles.

scholarly journals Thermal Properties of Polyester/Epoxy Blend

2021 ◽  
pp. 1128-1134
Author(s):  
Aqeel Mohsin Ali ◽  
Mohammed A. Jaber ◽  
Nooraldeen A. Toama
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Properties ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Unsaturated Polyester ◽  
Weight Fraction ◽  
Peak Shift ◽  
Cross Linking ◽  
Epoxy Matrices

Unsaturated polyester toughened Epoxy was developed. Epoxy resin had toughened by weight fraction of 10, 20, 30, and 40 wt. % unsaturated polyester. FTIR spectroscopy has been used to investigating the intermolecular hydrogen bonding. Unsaturated polyester–epoxy matrices were characterized for their thermal properties. The FTIR test detected a peak shift of the functional groups which can explain cross-linking occurs between the two resins. The crosslinking between epoxy and unsaturated polyester confirmed via the existence of the stretching asymmetrical C-C band and contraction of the  C-O band. The DSC test demonstrated that glass transition temperature value decreases with epoxy strengthening. The specific heat capacity and thermal conductivity have been affected the unsaturated polyester percentage. Thermal conductivity, specific heat capacity and thermal effuisivity increased by weight fraction of polyester. The thermal diffusivity values of blends showed a little decreasing.

Strengthening and Toughening of Unsaturated Polyester by Using Some Additives in Gear Application

2013 ◽  
Vol 390 ◽  
pp. 567-573
Author(s):  
A. Saad Najim ◽  
Jawad Hadi Nizar ◽  
Mohmmad A-Rida Russul
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Wear Resistance ◽  
Volume Fraction ◽  
Unsaturated Polyester ◽  
Weight Fraction ◽  
Short Length ◽  
Mechanical And Thermal Properties ◽  
Physical Testing ◽  
Resistance Criterion

In present paper a new composite materials of (polyester/ (GF, SiC, PVC, Cu)) was prepared and studied to be used in gear applications. Samples were prepared with range of short length fiber (0.02-0.08 mm) and the weight fraction of E-glass fiber varying from (0-25)% . The best sample according to the wear resistance criterion was selected and some additives were used to improve impact, tensile, hardness, and thermal conductivity . These additives are 5% SiC, 6% PVC and 4% Cu. Samples properties were evaluated by using standard mechanical and physical testing. The results show improvement in all mechanical and thermal properties. Although the tensile strength decreases with increasing volume fraction of fiber content.

scholarly journals Effect of water absorption on some mechanical and physical properties of epoxy/polyurethane blend reinforced with nano silica powder

2019 ◽  
Vol 15 (32) ◽  
pp. 92-98
Author(s):  
Rana M. Salih
Keyword(s):  
Thermal Conductivity ◽  
Diffusion Coefficient ◽  
Impact Strength ◽  
Flexural Strength ◽  
Physical Properties ◽  
Nano Silica ◽  
Silica Powder ◽  
Mechanical And Physical Properties ◽  
The Impact ◽  
And Diffusion

The aim of this work is to evaluate some mechanical and physicalproperties (i.e. the impact strength, hardness, flexural strength,thermal conductivity and diffusion coefficient) of(epoxy/polyurethane) blend reinforced with nano silica powder (2%wt.). Hand lay-up technique was used to manufacture the compositeand a magnetic stirrer for blending the components. Results showedthat water had affected the bending flexural strength and hardness,while impact strength increased and thermal conductivity decreased.In addition to the above mentioned tests, the diffusion coefficientwas calculated using Fick’s 2nd law.

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