Evaluation of Izod impact and bend properties of epoxy composites reinforced with mallow fibers

Costa, Ulisses Oliveira; Nascimento, Lúcio Fábio Cassiano; Garcia, Julianna Magalhães; Bezerra, Wendell Bruno Almeida; Monteiro, Sérgio Neves

doi:10.1016/j.jmrt.2019.10.066

Cited by 30 publications

(25 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As such, it decreases the area of fracture and, consequently, a lower energy is absorbed in the hammer impact. Margem et al [ 62 ] found for mallow fiber/epoxy the critical length of 2.6 mm, and an interfacial strength of 3.1 MPa, these results are comparable to the present case, whereas Costa et al [ 60 ] found a higher value for Izod impact energy in association with lower mallow fiber/epoxy interfacial strength, presented in Figure 11 . These previous results evidence that the main mechanism of fracture in Izod impact test is the pullout, which was reported to be the main contributor to the total absorbed impact energy.…”

Section: Resultssupporting

confidence: 87%

“…Figure 9 shows a comparison between the data of the present work and the results of epoxy matrix composites reinforced with different NLFs, as well as of plain epoxy obtained in previous works [ 20 , 58 , 59 , 60 , 61 ]. Comparing the results of epoxy matrix composites reinforced with different NLFs with the composites investigated in the present work, it was found that epoxy composites with 20 vol% of mallow fiber and 20 vol% of ramie fibers exhibit 3 and 2 times higher, respectively, average absorption energy than the tucum fiber composites.…”

Section: Resultsmentioning

confidence: 64%

See 1 more Smart Citation

Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites

et al. 2020

Self Cite

View full text Add to dashboard Cite

The replacement of synthetic fibers by natural fibers has, in recent decades, been the subject of intense research, particularly as reinforcement of composites. In this work, the lesser known tucum fiber, extracted from the leaves of the Amazon Astrocaryum vulgare palm tree, is investigated as a possible novel reinforcement of epoxy composites. The tucum fiber was characterized by pullout test for interfacial adhesion with epoxy matrix. The fiber presented a critical length of 6.30 mm, with interfacial shear strength of 2.73 MPa. Composites prepared with different volume fractions of 20 and 40% tucum fiber were characterized by tensile and Izod impact tests, as well as by ballistic impact energy absorption using .22 ammunition. A cost analysis compared the tucum fiber epoxy composites with other natural and synthetic fiber reinforced epoxy composites. The results showed that 40 vol% tucum fiber epoxy composites increased the tensile strength by 104% and the absorbed Izod impact energy by 157% in comparison to the plain epoxy, while the ballistic performance of the 20 vol% tucum fiber composites increased 150%. These results confirmed for the first time a reinforcement effect of the tucum fiber to polymer composites. Moreover, these composites exhibit superior cost effectiveness, taking into account a comparison made with others epoxy polymer composites.

show abstract

Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 64%

Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Figure 8 shows the graphs corresponding to the results of tensile strength, elastic modulus, and elongation presented in Table 2 . The tensile strength values obtained for the DGEBA-TETA epoxy resin are comparable with values already consolidated in the literature [ 2 , 23 , 27 ]. The results show relatively superior tensile properties for composites reinforced with different volume fractions of carnauba fibers.…”

Section: Resultssupporting

confidence: 86%

“…This fact is associated with the effect of carnauba fibers as a means of interruption or deviation of the crack’s propagation direction, which contribute to a greater rupture surface area. Therefore, this causes an increase in the absorbed impact energy [ 27 ]. The important point regarding the impact results is that the carnauba fiber might indeed promote a reinforcement effect in polymer matrix composites.…”

Section: Resultsmentioning

confidence: 99%

“…The system was then sealed and subjected to a pressure of 5 tons for 24 h. Figure 3 c shows a typical cured composite plate in which most fibers are well aligned, which confirms that fibers did not move during the 24 h pressing. For the calculation of the volume fraction of the composite, the density of 1.11 g/cm 3 was used for the DGEBA-TETA epoxy resin [ 27 ] and 1.34 g/cm 3 for the carnauba fibers [ 26 ]. Composite plates with 0, 10, 20, 30, and 40 vol% of fibers were prepared.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites

et al. 2020

Self Cite

View full text Add to dashboard Cite

A basic characterization of novel epoxy matrix composites incorporated with up to 40 vol% of processed leaf fibers from the Copernicia prunifera palm tree, known as carnauba fibers, was performed. The tensile properties for the composite reinforced with 40 vol% of carnauba fibers showed an increase (40%) in the tensile strength and (69%) for the elastic modulus. All composites presented superior elongation values in comparison to neat epoxy. Izod impact tests complemented by fibers/matrix interfacial strength evaluation by pullout test and Fourier transformed infrared (FTIR) analysis revealed for the first time a significant reinforcement effect (> 9 times) caused by the carnauba fiber to polymer matrix. Additional thermogravimetric analysis (TG/DTG) showed the onset of thermal degradation for the composites (326 ~ 306 °C), which represents a better thermal stability than the plain carnauba fiber (267 °C) but slightly lower than that of the neat epoxy (342 °C). Differential scanning calorimetry (DSC) disclosed an endothermic peak at 63 °C for the neat epoxy associated with the glass transition temperature (Tg). DSC endothermic peaks for the composites, between 73 to 103 °C, and for the plain carnauba fibers, 107 °C, are attributed to moisture release. Dynamic mechanical analysis confirms Tg of 64 °C for the neat epoxy and slightly higher composite values (82–84 °C) due to the carnauba fiber interference with the epoxy macromolecular chain mobility. Both by its higher impact resistance and thermal behavior, the novel carnauba fibers epoxy composites might be considered a viable substitute for commonly used glass fiber composites.

show abstract

Investigation of effects of extreme environment conditions on multiwall carbon nanotube‐epoxy adhesive and adhesive joints

et al. 2022

View full text Add to dashboard Cite

Mechanical and thermal properties of epoxy‐multiwall carbon nanotubes (MWCNTs) at different fractions (0.0, 0.25, 0.5, and 1.0 wt%) were investigated. The dispersion of the nanotubes in an epoxy adhesive commonly used in an automotive application was performed using a grease worker. This device has a perforated plate, able to produce mechanical shear. To investigate the behavior of adhesive‐carbon nanotubes mixtures and the bonding performance, four groups were prepared using two different perforated plates, P1 and P2. All MWCNT‐epoxy were submitted to extreme environmental conditions, resumed as reference (non‐aged), 500 h at 100°C, 500 h at 95% of relative humidity at 40°C, and 500 h under salt spray. A reduction in glass transition temperature was observed with the addition of the nanofiller and no increases on statistic heat‐resistant index temperature were noticed in MWCNT‐epoxy produced using both plates. Changes in the peaks at 3300, 1510, and 835 cm−1 after aging were seen in infrared spectra. The MWCNT addition to pure epoxy increased the apparent shear strength by 14% using P1. In P2, which has the mechanical shear greater by a factor of 2, no significant differences were observed, due to defects and agglomeration of MWCNTs observed by image analysis.

show abstract

Evaluation of Izod impact and bend properties of epoxy composites reinforced with mallow fibers

Cited by 30 publications

References 28 publications

Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites

Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites

Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites

Investigation of effects of extreme environment conditions on multiwall carbon nanotube‐epoxy adhesive and adhesive joints

Contact Info

Product

Resources

About