Water Absorption in Sisal Fiber Reinforced-Polymeric Matrix Composites: Three-Dimensional Simulations and Experiments

2018 ◽  
Vol 20 ◽  
pp. 143-154
Author(s):  
D. Gomes dos Santos ◽  
A.G. Barbosa de Lima ◽  
P. de Sousa Costa ◽  
E. Santana de Lima ◽  
G. Moreira ◽  
...  
Keyword(s):  
Water Absorption ◽  
Polymer Composite ◽  
Three Dimensional ◽  
High Water ◽  
Water Bath ◽  
Sisal Fiber ◽  
Matrix Composites ◽  
Polyester Matrix ◽  
Sisal Fibers ◽  
Polymeric Matrix Composites

In this work was conducted a theoretical and experimental study of water absorption in polyester matrix composites reinforced with sisal fiber at temperatures of 25, 50 and 70°C. A fiber content 44.6% sisal fibers, and 55.4% polyester matrix were used in the manufacture of the polymer composite. The dimensions of the composite were 20x20x3mm3and 20x20x6mm3. Water absorption tests were conducted by immersion of the samples in a distilled water bath and the water uptake calculated by weight difference of the samples in the dry and wetted condition at different elapsed time. A three-dimensional mathematical model was developed to predict mass transfer during the water absorption inside the parallelepiped solid. Results of water absorption kinetic and moisture content distribution inside the composites showed the more favorable areas which presents delamination problems due the weakness of the fiber-matrix interface and consequently, reduction in the mechanical properties. It was found that the high water bath temperatures accelerate the absorption process and that the water absorption of the sisal reinforced polymer composite with 3 mm of thickness was faster than the with 6 mm of thickness.

scholarly journals Impact of Surface Modification and Nanoparticle on Sisal Fiber Reinforced Polypropylene Nanocomposites

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Idowu David Ibrahim ◽  
Tamba Jamiru ◽  
Emmanuel Rotimi Sadiku ◽  
Williams Kehinde Kupolati ◽  
Stephen Chinenyeze Agwuncha
Keyword(s):  
Water Absorption ◽  
Weight Ratio ◽  
Tensile Modulus ◽  
High Strength ◽  
Sisal Fiber ◽  
Plant Fibers ◽  
Environmental Friendliness ◽  
Polypropylene Nanocomposites ◽  
Fiber Treatment ◽  
Sisal Fibers

The use of plant fibers, polymer, and nanoparticles for composite has gained global attention, especially in the packaging, automobile, aviation, building, and construction industries. Nanocomposites materials are currently in use as a replacement for traditional materials due to their superior properties, such as high strength-to-weight ratio, cost effectiveness, and environmental friendliness. Sisal fiber (SF) was treated with 5% NaOH for 2 hours at 70°C. A mixed blend of sisal fiber and recycled polypropylene (rPP) was produced at four different fiber loadings: 10, 20, 30, and 40 wt.%, while nanoclay was added at 1, 3, and 5 wt.%. Maleic anhydride grafted polypropylene (MAPP) was used as the compatibilizer for all composites prepared except the untreated sisal fibers. The characterization results showed that the fiber treatment, addition of MAPP, and nanoclay improved the mechanical properties and thermal stability and reduced water absorption of the SF/rPP nanocomposites. The tensile strength, tensile modulus, and impact strength increased by 32.80, 37.62, and 5.48%, respectively, when compared to the untreated SF/rPP composites. Water absorption was reduced due to the treatment of fiber and the incorporation of MAPP and nanoclay.

Polymer Composite with Sisal Fiber Used for Node Reinforce in Space-Truss with Stamped Connection

2015 ◽  
Vol 719-720 ◽  
pp. 202-205
Author(s):  
Cleirton A.S. Freitas ◽  
Mucio M.S. Nobrega ◽  
Édipo A. Bezerra ◽  
Otávio R.O. Cavalcante
Keyword(s):  
Polymer Composite ◽  
Carrying Capacity ◽  
Three Dimensional ◽  
Sisal Fiber ◽  
Load Carrying Capacity ◽  
Space Truss ◽  
Load Carrying ◽  
Steel Bars ◽  
Space Trusses

Space trusses are three-dimensional structures made of steel bars very frequently used at the roof construction. The bars, with tubular section, are linking in the 3D form by connections. There are several types of connections to attach these members. The most economical connection is the staking end-flattened connection, also called typical node. The reduced cost and the fast assemblage of the truss are among their advantages. However, such connections present disadvantages like eccentricities and stiffness weakening of the tubular members. This research presents suggestions of reinforcement and constructive correction in the connection in order to increase its capacity. The base for this is the reduction of the eccentricity in typical node applying the spacer. This spacer was made by polymer composite with sisal fiber. In this work was developed experimental lab tests in prototypes with fifty four meters square of area. The results show an increase of 26% for collapse in the truss load carrying capacity when the suggested changes proposed in this article are used for the staking end-flattened connections.

scholarly journals Effect of Surface Biopolymeric Treatment on Sisal Fiber Properties and Fiber-Cement Bond

2017 ◽  
Vol 12 (2) ◽  
pp. 155892501701200 ◽  
Author(s):  
Paulo R. L. Lima ◽  
Heni Mirna Santos ◽  
Geany Peruch Camilloto ◽  
Renato Souza Cruz
Keyword(s):  
Water Absorption ◽  
Cellulose Acetate ◽  
Natural Fiber ◽  
Absorption Capacity ◽  
Surface Treatments ◽  
Bond Stress ◽  
Sisal Fiber ◽  
Fiber Properties ◽  
Study Results ◽  
Sisal Fibers

Sisal fiber, available in various semi-arid regions around the world, is the most studied natural fiber for the reinforcement of polymeric and cement-based composites. However, to improve the fiber–matrix interaction and to reduce the hydrophilicity of the fiber, it is necessary to establish surface treatments that employ sustainable materials, unlike conventional surface treatments. In this work, sisal fibers were coated separately with cellulose acetate, hydrophobic starch, and cassava starch biopolymers in order to verify the possibility of reducing the water absorption capacity of the fiber by the use of a biodegradable resin. A combination of Fourier transform infrared spectroscopy, scanning electron microscopy, and water absorption and tensile tests was used to investigate the effects of the surface treatments on the sisal fiber properties. Pullout tests of sisal fibers with embedded lengths of 20 mm and 40 mm were performed to determine the influence of the treatments on the bond stress with cement mortar. Composites with 4 vol % short fiber were produced and tested for flexion. The study results indicated that all treatments reduced the mechanical properties of the fiber; however, the layer of the cellulose acetate biopolymer film formed on the fiber surface was effective in reducing the fiber hydrophilicity. Experimental tests on the composites revealed that the cellulose acetate treatment reduced the bond stress and, to a lesser degree, the flexural toughness of the composite, despite the increase in flexural strength.

scholarly journals Durability Study of Hybrid Fiber Reinforced Concrete

2021 ◽  
Vol 11 (1) ◽  
pp. 59-69
Author(s):  
Srinivasa Rao Naraganti
Keyword(s):  
Reinforced Concrete ◽  
Water Absorption ◽  
Cement Composite ◽  
Strength Loss ◽  
Fiber Reinforced Concrete ◽  
Sisal Fiber ◽  
Fiber Reinforced ◽  
Acid Attack ◽  
Chloride Permeability ◽  
Sisal Fibers

Sisal has been reported as one of the promising fibers for cement composite applications. The durability of sisal fiber reinforced concrete (SFRC) and steel sisal fiber reinforced concrete (SSFRC) have not been reported. Water absorption, rapid chloride permeability, and acid attack tests are conducted on fibrous cement composites. Steel, polypropylene, and sisal fibers with a total volume of 0.50%, 1.00%, 1.25%, and 1.50% were used. Sisal at a content of 1.50% in SFRC increases the water absorption by 76%, but it is reduced to 30% for SSFRC with 0.2% of sisal content. SFRC and SSFRC show the increased permeability of 1.69% and 2.09% respectively. SFRC experiences the highest volume loss of 6.52%. SSFRC illustrates the resistance to the mass loss and compressive strength loss. In conclusion, untreated sisal in any form is found to be not advantageous for durable fibrous concrete structures.

Charpy Impact Tests in Epoxy Matrix Composites Reinforced with Continuous Sisal Fiber

2014 ◽  
Vol 775-776 ◽  
pp. 290-295 ◽  
Author(s):  
Sergio Neves Monteiro ◽  
Frederico Muylaert Margem ◽  
Artur Camposo Pereira ◽  
Noan Simonassi ◽  
Michel Picanço Oliveira
Keyword(s):  
Energy Absorption ◽  
Epoxy Matrix ◽  
Charpy Impact ◽  
Fracture Analysis ◽  
Main Mechanism ◽  
Sisal Fiber ◽  
Matrix Composites ◽  
Impact Tests ◽  
Macroscopic Observation ◽  
Sisal Fibers

The objective of this work was to investigate the toughness behavior of epoxy matrix composites reinforced with up to 30% in volume of long, continuous and aligned sisal fibers by means of Charpy impact tests. The addition of sisal fibers results in a visible improvement in the energy absorption ability of the composites. Macroscopic observation of the post-impacted specimens and the SEM fracture analysis showed that longitudinal rupture through the sisal fiber interface with the epoxy matrix is the main mechanism for the higher toughness attended by these composites.

Green Composites Based on Recycled Plastic Reinforced Local Sisal Fibers

2015 ◽  
Vol 776 ◽  
pp. 264-270 ◽  
Author(s):  
N.P.G. Suardana ◽  
Ni Made Suaniti ◽  
I. Putu Lokantara
Keyword(s):  
Weight Loss ◽  
Acrylic Acid ◽  
Water Absorption ◽  
Fire Resistance ◽  
Production Costs ◽  
Sisal Fiber ◽  
Resistance Testing ◽  
Environmental Damage ◽  
Moisture Resistance ◽  
Sisal Fibers

Recycled polypropylene (PP) and sisal fiber, which are available in abundant ammount, can be used for producing a composite, a new material that reduce production costs and environmental damage. The new materials will be used for manufacturing floor tiles that are environmentally friendly, light but still technically qualified, and are expected to replace the ceramic tiles that are relatively heavy. However, the drawbacks in the application, natural fiber is a combustible material and it absorbs water easily (hydrophilic). To overcome these obstacles then a study on fiber chemical treatment was conducted. The purpose of this study is to determine the effect of chemical treatments on sisal fibers for fire resistance capability, the moisture resistance and tensile properties of the composites. So these composite materials can replace ceramic tile that is used for houses, hotels, ships and so on. In this research, sisal fibers with length of 10 mm were treated by NaOH and followed by Vulcan AF21 (Vulcan) of 5%, 10% and 20% for 2-hours for fire resistance, and other treatment with Acrylic acid (AA) of 1%, 5% and 10% for 1 hour at 50°C for moisture resistance. Fiber material that has been chemically treated is mixed with recycled PP. Test specimens were made in hot pressed. Fire resistance testing was conducted based on ASTM D635 standards, water absorption testing (ASTM D570), and tensile testing. The result shows that the higher the percentage of Vulcan treatment on sisal fiber is of 5%, 10% and 20%, the linear burning rate, the percentage of weight loss and weight loss rate of sisal fiber polypropylene composites decreases which means the composite is more resistant to fire. In general, the increase percentage of Vulcan on treatment sisal fibers shows a decrease in tensile strength and modulus of elasticity but a slight increase tensile strain of composite. Fiber treated with acrylic acid (AA) experienced a reduction of water absorption compared to the untreated of fiber composites.

scholarly journals Kaolin-Enhanced Superabsorbent Composites: Synthesis, Characterization and Swelling Behaviors

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1204
Author(s):  
Mengna Chen ◽  
Xuelong Chen ◽  
Caiyan Zhang ◽  
Baozheng Cui ◽  
Zewen Li ◽  
...  
Keyword(s):  
Water Absorption ◽  
Low Cost ◽  
High Water ◽  
Kinetic Mechanism ◽  
Swelling Kinetics ◽  
Synthesis Conditions ◽  
Ph Tolerance ◽  
Monovalent Salt ◽  
Infrared Spectrometer ◽  
Pseudo Second Order

One type of low-cost and eco-friendly organic‒inorganic superabsorbent composite (SAPC) was synthesized by free radical polymerization of acrylic acid (AA), starch (ST), sodium alginate (SA) and kaolin (KL) in aqueous solution. The structure and morphology of the SAPC were characterized by Fourier transform infrared spectrometer (FT-IR), scanning electron microscope (SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The influence of different reaction conditions on water absorption of SAPC, i.e., SA and KL contents, AA neutralization degree (ND), potassium persulfate (KPS) and N, N′-methylenebisacrylamide (MBA) loading were systematically studied. Under the optimal synthesis conditions, very high water absorption of 1200 g/g was achieved. The swelling kinetic mechanism of SAPC was studied by pseudo-second order swelling kinetics model and Ritger‒Peppas model. The performances of SAPC under different environments were tested and results revealed that this new SAPC had excellent swelling capacity, high water retention, good salt tolerance in monovalent salt solution (NaCl solution) and good pH tolerance between 4 and 10.

Sign in / Sign up

Export Citation Format

Share Document