scholarly journals STUDY OF SOME PROPERTIES FOR COLD-CURING ACRYLIC RESIN REIENFORCED WITH NANO YTTRIUM OXIDE

2018 ◽  
Vol 18 (1) ◽  
pp. 137-145
Author(s):  
Mohammed R Gharkan ◽  
Bassam I Khalil ◽  
Ahmed H Ali ◽  
Sally A H Kadhum ◽  
Ahmad H Aliwi
Keyword(s):  
Thermal Conductivity ◽  
Water Absorption ◽  
Water Adsorption ◽  
High Strength ◽  
Acrylic Resin ◽  
Weight Fraction ◽  
Mechanical Tests ◽  
Maximum Hardness ◽  
Conductivity Water ◽  
Composite Samples

Through the last two to three dictate, composite materials had being applied enormously inmany industry fields. This is as fact that this type of materials possess; high strength toweight ratio, high stiffness, and limit thermal conductivity. In this work Nano-Yttrium oxidewith (0%, 1%, 2%, 3% and 4%) weight fraction had been added, as reinforcement phase, toacrylic resin (cold curing). Various physical and mechanical tests had done for determiningthe development in the properties of the prepared composite samples like: hardness, tensilestrength, thermal conductivity, water absorption and density. The results show: decreasingtensile strength with increasing Nano-Y2O3 weight fraction, maximum decline in tensilestrength was at (4) % Y2O3, about (16.2) % of Acrylic strength; increasing in hardness withincreasing Nano-Y2O3 weight fraction, maximum hardness was at (4) % Y2O3, about (107)% of Acrylic hardness, no obviously density change with increasing Nano-Y2O3 weightfraction, decreasing water adsorption with increasing Nano-Y2O3 weight fraction, maximumdecreasing in water absorption percentage was at (4) % of Y2O3, about (93) % of Acrylicwater absorption, decreasing thermal conductivity with increasing weight fractions of Nano-Y2O3, maximum decline in thermal conductivity was at (4)% of Y2O3 , about (90)% ofAcrylic thermal conductivity

scholarly journals Influence of nanoclays on water uptake and flexural strength of glass–polyester composites

2020 ◽  
Vol 18 ◽  
pp. 228080002093018
Author(s):  
Ali Nemati Giv ◽  
Sina Rastegar ◽  
Mutlu Özcan
Keyword(s):  
Flexural Strength ◽  
Water Absorption ◽  
High Strength ◽  
Time Duration ◽  
Sem Images ◽  
Water Absorption Test ◽  
Polyester Composites ◽  
Chopped Strand Mat ◽  
Nanoclay Content ◽  
Composite Samples

Fiber-reinforced polyester composites have received significant attention in a variety of applications due to their considerable potential due to such characteristics as high strength, stiffness, and modulus. However, one of the most important concerns about polymeric composites is their sensitivity to moisture attack. This work has been conducted to investigate the effects of nanoclay addition on reinforcing glass/polyester composites against water absorption and the resultant deterioration of flexural strength. Therefore, chopped strand mat and woven fiberglass polyester specimens were fabricated by using the hand lay-up technique with varying weight percentages of Cloisite 20A nanoclays (0, 1.5, and 3 wt%) and immersion in water for a time duration of 21 days. The specimens were weighed for the water absorption test. The results showed a remarkable drop in water absorption of the composite samples with the increase of nanoclay content. Moreover, although all the pure and nanocomposite specimens underwent degradation in flexural strength due to the water absorption, the strength was found to significantly increase with increasing the percentage of nanoclay at all immersion periods. The experimental results were confirmed by scanning electron microscopy (SEM). SEM images indicated that the presence of nanoclay protected the fiber/matrix interfaces.

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. %.

Transport and Flame Properties of Natural Fibre Reinforced Polymers

2005 ◽  
Vol 13 (8) ◽  
pp. 753-764 ◽  
Author(s):  
F.G. Torres ◽  
R. Flores ◽  
J.F. Dienstmaier ◽  
O.A. Quintana
Keyword(s):  
Thermal Conductivity ◽  
Water Absorption ◽  
High Density Polyethylene ◽  
Structural Integrity ◽  
Natural Fibre ◽  
Fibre Content ◽  
Reinforced Polymers ◽  
Void Fractions ◽  
Conductivity Water ◽  
Burn Rate

The authors studied the thermal conductivity, water absorption and linear burn rate of natural fibre reinforced polymers (NFRP). High density polyethylene (HDPE) and degradable starch-based polymers were used as matrices. Discrete sisal ( Agave Sisalacea) fibres were used as reinforcement. The effect of fibre content, moisture and void fractions on thermal conductivity was studied. From water absorption tests, it was determined that water diffusion in NFRPs corresponds to a Fickian process only in the early stages of diffusion. Diffusivities were obtained for that case. Linear burn rate experiments showed that sisal reinforced polymers burn twice as fast as unreinforced HDPE specimens, however the reinforced specimens show better structural integrity during burning than the unreinforced ones, probably due to an increase in viscosity and melt strength due to the presence of reinforcing fibres.

scholarly journals Effect of Silica Fume as a Component of Alternative Binder on the Selected Technically Important Characteristics of Bio-Aggregate-Based Composites

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2153 ◽  
Author(s):  
Nadezda Stevulova ◽  
Jozef Junak ◽  
Vojtech Vaclavik
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Bulk Density ◽  
Silica Fume ◽  
River Sand ◽  
Biomass Waste ◽  
The Matrix ◽  
Composite Samples ◽  
Hemp Hurd

This experimental study was focused on the application of an alternative binder based on MgO, and the variation of its components by the combination of two MgO products obtained by the calcinations of natural magnesite, siliceous materials (river sand and silica fume), and alkaline admixture in the mixture for a preparation of composite based on biomass waste such as hemp hurds as organic filler. This paper presents the results of the effect of an MgO binder composition on the compressive strength of the bio-aggregate-based composites. Other physical properties, such as the bulk density, thermal conductivity coefficient, and water absorption, were also investigated. The measured strength parameters of the bio-composite samples that were hardened for 28 days demonstrate that the binder consisting of optimal calcined MgO and silica fume as a total replacement for sand ensures a good binding of the matrix with hemp hurd compared to other varied compositions of alternative binder. No significant differences in bulk density and thermal conductivity values were found for these composites. However, the bio-composite specimen with an MgO–SiO2 matrix had the highest compressive strength and achieved the lowest value of water absorption. An increase in hardening time of up to 90 days led to a significant improvement of strength as well as reduction in permeability.

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.

Hybridization effect of coir fiber on physico-mechanical properties of polyethylene-banana/coir fiber hybrid composites

2018 ◽  
Vol 25 (1) ◽  
pp. 133-141 ◽  
Author(s):  
Nirupama Prasad ◽  
Vijay Kumar Agarwal ◽  
Shishir Sinha
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Water Absorption ◽  
Hybrid Composites ◽  
Relative Weight ◽  
Weight Fraction ◽  
Absorption Capacity ◽  
Coir Fiber ◽  
Banana Fiber ◽  
Composite Samples

AbstractIn this paper, an attempt has been made to investigate the effect of coir fiber addition along with the banana fiber in low-density polyethylene (LDPE) to develop cost-effective and high-performance composite material. The composite samples were prepared at fixed fiber content (25 wt%) and with varying relative weight fraction of banana and coir fiber using compression molding technique. The effect of hybridization was analyzed through the mechanical properties (tensile, flexural, and impact), thermal stability, morphological behavior, and water absorption behavior. Additionally, scanning electron microscopy studies had been carried out on the tensile fractured surface for all composite samples to examine the fracture behavior of the composite samples. The results showed that the incorporation of coir fiber into the banana fiber composites of up to 50% by weight led to enhancement of the mechanical properties and thermal stability and to reduction of the water absorption capacity of the banana fiber/LDPE composites.

scholarly journals Green Building Materials Based on Waste Filler and Binder

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Nadezda Stevulova ◽  
Jozef Junak
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Building Materials ◽  
Composite System ◽  
Treatment Process ◽  
Green Building ◽  
Chemically Modified ◽  
Green Building Materials ◽  
Conductivity Water

Abstract This study is aimed at the application of alternative binder (AB) into bio-aggregate-based composite. The technically important parameters (density, thermal conductivity, water absorption and compressive strength) of 28, 60 and 90 days hardened green composites containing chemically and physico-chemically modified hemp hurds (HH) with AB compared to the Portland cement (PC) are presented. Testing of two reference bio-composites with original HH confirmed higher values of compressive strength and thermal conductivity unlike water absorption for all hardened specimens based on alternative binder (MgO-cement) compared to conventional PC. Changes in the final properties of hardened bio-composites were affected by treatment process of organic filler and alkaline nature of MgO-cement. The combination of purified HH by ultrasound treatment and AB appears to be promising for preparation of bio-based composite material with better properties compared to PC. In this paper, other option of the preparation of bio-composite system based on original (non-treated) filler and binder consisting of optimal activated MgO and silica fume is presented.

scholarly journals STUDYING THE EFFECT OF NATURAL BAMBOO AND RICE HUSK POWDERS ON COMPRESSIVE STRENGTH and HARDNESS OF ACRYLIC RESIN

2019 ◽  
Vol 19 (1) ◽  
pp. 105-113
Author(s):  
Jawad K Oleiwi ◽  
Qahtan A Hamad ◽  
Hadil J Abdul Rahman
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Rice Husk ◽  
Compression Strength ◽  
Color Stability ◽  
High Strength ◽  
Acrylic Resin ◽  
Weight Fraction ◽  
Denture Base ◽  
Effect Of Particle Size

Denture base is the part of a denture that rests on the foundation tissues and to which teeth areAttached. Denture base may be complete or partial used for the alteration of missing natural teeth.The most popular material utilized for the fabrication of dentures base is the poly (methylmethacrylate) (PMMA) because is distinguished by many characteristic. The remarkable clarity ofa methyl methacrylate resin, its relatively high strength and hardness, its color stability under allconditions of dental use, its insolubility in the mouth fluids, all of these properties combine toprovide an excellent material for the prosthetics denture (S. S Carmen, 2010 and R. K. Alla 2013).This survey illustrate the effect of particle size of powders and weight fraction of natural Bambooand Rice Husk powders on PMMA, with the selected size particles of (25?m and 75?m) andweight fraction (2, 4, 6 and 8wt. %), on compression strength and hardness, and these experiencewere accomplished at a temperature of laboratory. The results showed improved in the hardnessand compression with concentration rate of Rice Husk and Bamboo powders in compositesamples. Also, the highest values of compressive strength and hardness were (300MPa.) and (86)respectively for (PMMA-8%RH) and particle size (25 ?m).

scholarly journals Data on thermal conductivity, water vapour permeability and water absorption of a cementitious mortar containing end-of-waste plastic aggregates

Data in Brief ◽  
2018 ◽  
Vol 18 ◽  
pp. 1057-1063 ◽  
Author(s):  
Luciano Di Maio ◽  
Bartolomeo Coppola ◽  
Luc Courard ◽  
Frédéric Michel ◽  
Loredana Incarnato ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Water Absorption ◽  
Water Vapour ◽  
Water Vapour Permeability ◽  
Vapour Permeability ◽  
Waste Plastic ◽  
Conductivity Water

Incorporation of Iraqi Rocks in the Production of Eco-Friendly Cement Mortar

2020 ◽  
Vol 38 (10A) ◽  
pp. 1522-1530
Author(s):  
Rawnaq S. Mahdi ◽  
Aseel B. AL-Zubidi ◽  
Hassan N. Hashim
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Structural Properties ◽  
Mechanical Milling ◽  
Cement Mortar ◽  
Cement Mortars

This work reports on the incorporation of Flint and Kaolin rocks powders in the cement mortar in an attempt to improve its mechanical properties and produce an eco-friendly mortar. Flint and Kaolin powders are prepared by dry mechanical milling. The two powders are added separately to the mortars substituting cement partially. The two powders are found to improve the mechanical properties of the mortars. Hardness and compressive strength are found to increase with the increase of powders constituents in the cement mortars. In addition, the two powders affect water absorption and thermal conductivity of the mortar specimens which are desirable for construction applications. Kaolin is found to have a greater effect on the mechanical properties, water absorption, and thermal conductivity of the mortars than Flint. This behavior is discussed and analyzed based on the compositional and structural properties of the rocks powders.

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