Lignocellulosic materials and unsaturated polyester matrix composites: Interfacial modifications

2005 ◽  
Vol 12 (1-2) ◽  
pp. 3-24 ◽  
Author(s):  
N. E. Marcovich ◽  
M. M. Reboredo ◽  
M. I. Aranguren
Keyword(s):  
Unsaturated Polyester ◽  
Lignocellulosic Materials ◽  
Matrix Composites ◽  
Polyester Matrix

Mechanical properties of jute fiber–reinforced UP/PU hybrid network composites

2019 ◽  
Vol 27 (9) ◽  
pp. 546-556 ◽  
Author(s):  
Richa Singh ◽  
B Singh ◽  
Hina Tarannum
Keyword(s):  
Mechanical Properties ◽  
Unsaturated Polyester ◽  
Fiber Surface ◽  
Mechanical Analysis ◽  
Hybrid Networks ◽  
Hybrid Network ◽  
Matrix Composites ◽  
Scanning Calorimetry ◽  
Jute Fibers ◽  
Polyester Matrix

Hybrid networks (unsaturated polyester–polyurethane (UP/PU)) of UP resin and PU prepolymer were synthesized and characterized for their phase miscibility with the help of Fourier transform infrared spectroscopy, differential scanning calorimetry, dynamic mechanical analysis (DMA), and atomic force microscopy. The existence of hydrogen bonded –NH groups, broadened glass transition region, and reduced phase domains evidenced the formation of intermixed phase when compared with the parent UP. The optimum mechanical properties of UP/PU hybrid networks were observed at ∼5 wt% PU content. The composites made from treated jute fibers and UP/PU hybrid networks were evaluated for their physico-mechanical properties. DMA curves showed that UP/PU matrix composites had ∼20% higher storage modulus and ∼17% lower tan δ than the polyester matrix composites. The tensile and flexural strengths of these composites were increased by ∼13% and ∼40%, respectively. During accelerated aging, the UP/PU matrix composites retained ∼15% more tensile strength than the polyester matrix composites. Fractographic evidence, such as resin adherence onto the pullout fiber surface, fiber breakage, and adequate adhesion between the jute fibers and the resin, supported the superior properties of UP/PU matrix composites to polyester matrix composites.

Jute Fiber Reinforced Polymeric Composites With Flexible Interphase

2012 ◽  
Author(s):  
Tetsushi Koshino ◽  
Mohamed S. Aly-Hassan ◽  
Hiroyuki Hamada
Keyword(s):  
Unsaturated Polyester ◽  
Weight Ratio ◽  
Matrix Cracking ◽  
Jute Fiber ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Jute Fibers ◽  
Jute Cloth ◽  
Polyester Matrix ◽  
The Impact

In this research, the flexible interphase concept was introduced to enhance the poor mechanical properties of jute fiber reinforced unsaturated polyester matrix composites. The jute cloth reinforcement was obtained from recycled coffee bags. These jute cloths after washing by water and drying were soaked in mixture of Polybutadiene Epoxydied as flexible resin and acetone for 10 seconds. Several mixtures consist of 0, 2, 3.5, 5 and 8 wt% of Polybutadiene Epoxydied and 100, 98, 96.5, 95 and 92 wt% of acetone, respectively, to form flexible interface around the jute fibers. Jute cloth reinforced unsaturated polyester matrix composites with different flexible interphase incremental weight ((Wa-Wb)/Wb) ratios were fabricated by hand lay-up method and examined by a series of mechanical tests. The mechanical testing including tensile, bending, Izod strength impact and drop impact was carried out for these composites to evaluate the effect of the flexible interphase and acetone on the jute cloth composites. The flexible interphase succeed to control the mechanical properties of jute fiber reinforced unsaturated polyester matrix composites. Inserting flexible interphase between unsaturated polyester matrix and jute fibers leads to smooth fluctuation, less matrix cracking, in the second part after the knee point of each stress-strain curve as exhibited in composites with higher flexible interphase incremental weight ratio. This means not only the brittle matrix but also interface/interphase dominates the multiple matrix cracking behavior in jute cloth reinforced unsaturated polyester matrix composites. Inserting flexible interphase between unsaturated polyester matrix and jute fibers leads to less number of multiple cracking as shown in the second portion of flexural stress-displacement curve. This means the number of multiple cracking are dominated by flexible interphase. The impact strength of jute cloth reinforced unsaturated polyester matrix composites with flexible interphase incremental weight ratio of 1.2% is higher than that of jute cloth reinforced unsaturated polyester matrix composites without flexible interphase by about 45%. The impact energy after maximum load has increased significantly with all flexible interphase incremental weight ratios.

Tensile and Bending Properties of Jute Fiber Mat Reinforced Unsaturated Polyester Matrix Composites

2011 ◽  
Author(s):  
E. A. Elbadry ◽  
M. S. Aly-Hassan ◽  
H. Hamada
Keyword(s):  
Unsaturated Polyester ◽  
Flexural Modulus ◽  
Jute Fiber ◽  
Matrix Composites ◽  
Neat Resin ◽  
Three Point Bending ◽  
Pull Out ◽  
Weight Content ◽  
Polyester Matrix ◽  
Bending Loading

Jute fiber mat reinforced unsaturated polyester matrix composites having different fiber weight contents (11, 22, 32 wt%) were fabricated by modifying the hand lay-up technique with resin pre-impregnation into the jute mats in the vacuum. Tension and three-point bending tests were carried out to evaluate the effect of fiber contents on these mechanical properties of above-mentioned composites. The results showed that as the fiber weight content increases, tensile strength and modulus increase and the improvement had occurred at 22 wt% of fiber weight content with respect to that of neat resin. As the fiber weight content increases, flexural strength and modulus increase and the improvement had occurred at 11 and 32 wt% fiber contents for the flexural modulus and strength respectively compared to those of neat resin. Fiber pull out mechanism is the failure mode revealed at the fracture surfaces under tensile loading as well as at tension side of composites under bending loading.

Tensile Strength of Polyester Matrix Composites Reinforced with Giant Bamboo (Dendrocalmus giganteus) Fibers

2014 ◽  
Vol 775-776 ◽  
pp. 308-313 ◽  
Author(s):  
Sergio Neves Monteiro ◽  
Frederico Muylaert Margem ◽  
Lucas Barboza de Souza Martins ◽  
Rômulo Leite Loiola ◽  
Michel Picanço Oliveira
Keyword(s):  
Tensile Strength ◽  
Room Temperature ◽  
Polyester Resin ◽  
Bamboo Fiber ◽  
Matrix Composites ◽  
Limited Information ◽  
Specimen Length ◽  
Lignocellulosic Fibers ◽  
Polyester Matrix ◽  
Bamboo Fibers

Fibers of the giant bamboo (Dendrocalmus giganteus) are amongst the strongest lignocellulosic fibers. Although studies have been already performed, limited information exists on the mechanical properties of polymeric composites reinforced with continuous and aligned giant bamboo fibers. This work evaluates the tensile strength of this type of composite. Standard tensile specimens were fabricated with up to 30% of fibers aligned along the specimen length. The fibers were press-molded with a commercial polyester resin mixed with a hardener and cured for 24 hours at room temperature. The specimens were tensile tested in an Instron machine and the fracture surface analyzed by scanning electron microscopy. The tensile strength increased significantly with the amount of giant bamboo fiber reinforcing the composite. This performance can be associated with the difficult of rupture imposed by the fibers as well as with the type of cracks resulting from the bamboo fiber/polyester matrix interaction, which prevents rupture to occur.

scholarly journals Mechanical behavior of mallow fabric reinforced polyester matrix composites

2018 ◽  
Vol 7 (4) ◽  
pp. 515-519 ◽  
Author(s):  
Ygor Macabu de Moraes ◽  
Carolina Gomes Dias Ribeiro ◽  
Carlos Luiz Ferreira ◽  
Eduardo Sousa Lima ◽  
Jean Igor Margem ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Matrix Composites ◽  
Polyester Matrix

scholarly journals Characterization of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystals

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2838
Author(s):  
Grazielle da Silva Maradini ◽  
Michel Picanço Oliveira ◽  
Gabriel Madeira da Silva Guanaes ◽  
Gabriel Zuqui Passamani ◽  
Lilian Gasparelli Carreira ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
Unsaturated Polyester ◽  
Cost Effective ◽  
Bending Test ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Glass Fiber Composites ◽  
Superior Mechanical Properties ◽  
Polyester Matrix

The application of cellulose nanocrystal has lately been investigated as polymer composites reinforcement owing to favorable characteristics of biodegradability and cost effectiveness as well as superior mechanical properties. In the present work novel nanocomposites of unsaturated polyester matrix reinforced with low amount of 1, 2, and 3 wt% of cellulose nanocrystals obtained from conifer fiber (CNC) were characterized. The polyester matrix and nanocomposites were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), bending test, and thermogravimetric analysis (TGA). The result showed that the addition of only 2 wt% CNC increased the nanocomposite flexural strength by 159%, the ductility by 500% and the toughness by 1420%. Fracture analyses by SEM revealed a uniform participation of the CNC in the polyester microstructure. The resistance to thermal degradation of the CNC reinforced nanocomposites was improved in more than 20 °C as compared to neat polyester. No significant changes were detected in the water absorptions and XRD pattern of the neat polyester with incorporations up to 3 wt% CNC. These results reveal that the 2 wt% CNC nanocomposite might be a promising more ductile, lightweight and cost-effective substitute for conventional glass fiber composites in engineering applications.

Izod Toughness Behavior of Continuous Palf Fibers Reinforced Polyester Matrix Composites

2017 ◽  
pp. 41-47
Author(s):  
Gabriel O. Glória ◽  
Giulio R. Altoé ◽  
Maycon A. Gomes ◽  
Carlos Maurício F. Vieira ◽  
Maria Carolina A. Teles ◽  
...  
Keyword(s):  
Matrix Composites ◽  
Polyester Matrix
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