Dynamic mechanical and thermal mechanical analysis of Cyperus malaccensis sedge fiber reinforced GO-incorporated epoxy nanocomposites: a short communication

Neuba, Lucas de Mendonça; Junio, Raí Felipe Pereira; Monteiro, S. N.; Carvalho, Magno Torres; Ribeiro, Maria Eduarda Araújo; Lazarus, Benjamin S.; Pereira, Artur Camposo; Monteiro, Sérgio Neves

doi:10.1016/j.jmrt.2023.03.075

Cited by 8 publications

(2 citation statements)

References 43 publications

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“…Finally, in the third stage, a rubbery region is reached, characterized by a second plateau. [ 32 ]. For the PLA samples ( Figure 4 A), it was observed that the storage modulus exhibits a long plateau in the temperature range from 30 to 55 °C for PLA and PLA 5%, while for PLA 10%, this plateau is shorter (30 to 45 °C).…”

Section: Resultsmentioning

confidence: 99%

Ethylene Scavenging Films Based on Ecofriendly Plastic Materials and Nano-TiO2: Preparation, Characterization, and In Vivo Evaluation

Maldonado,

Aguilar,

Hauser

et al. 2024

Polymers

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It is known that ethylene plays an important role in the quality characteristics of fruits, especially in storage. To avoid the deterioration of fruits caused by ethylene, titanium dioxide (TiO2) has been used due to its photocatalytic capacity. The aim of this study was to develop films based on two types of biopolymers, Mater-Bi (MB) and poly-lactic acid (PLA), with nanoparticles of TiO2 and to determine their ethylene removal capacity and its application in bananas. First, the films were fabricated through an extrusion process with two different concentrations of TiO2 (5 and 10% w/w). Then, the films were characterized by their structural (FTIR), morphological (SEM), thermal (DSC and TGA), dynamic (DMA), barrier, and mechanical properties. The ethylene removal capacities of the samples were determined via gas chromatography and an in vivo study was also conducted with bananas for 10 days of storage. Regarding the characterization of the films, it was possible to determine that there was a higher interaction between PLA with nano-TiO2 than MB; moreover, TiO2 does not agglomerate and has a larger contact surface in PLA films. Because of this, a higher ethylene removal was also shown by PLA, especially with 5% TiO2. The in vivo study also showed that the 5% TiO2 films maintained their quality characteristics during the days in storage. For these reasons, it is possible to conclude that the films have the capacity to remove ethylene. Therefore, the development of TiO2 films is an excellent alternative for the preservation of fresh fruits.

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Section: Resultsmentioning

confidence: 99%

Ethylene Scavenging Films Based on Ecofriendly Plastic Materials and Nano-TiO2: Preparation, Characterization, and In Vivo Evaluation

Maldonado,

Aguilar,

Hauser

et al. 2024

Polymers

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“…A possible reason for this behavior could be assigned to weak interfacial interaction, mainly caused by waxes and moisture absorption present on the surface of the sedge fibers. Therefore, the present study focused on investigating nine alkaline treatment conditions following NaOH concentrations of 3%, 5%, and 10% as well as immersion times of 24, 48, and 72 h. This present investigation aimed to be a remarkable enhancement for the ballistic, thermal, and mechanical performance already reported [35][36][37]. Thus, it could be a promising sustainable material for engineering and technological applications and present a significant reduction in the manufacturing cost for novel composites.…”

Section: Introductionmentioning

confidence: 99%

Alkaline Treatment Investigation for Sedge Fibers (Cyperus malaccensis): A Promising Enhancement

et al. 2023

Self Cite

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Natural fibers have some advantages in comparison to synthetic fibers, especially because they are more environmentally friendly. For this reason, using them as a reinforcement for polymeric matrices is growing exponentially. However, they present the disadvantage of having the hydrophilic nature, which strongly reduces the interface interaction. Sedge fibers have been investigated when reinforcing an epoxy matrix in terms of ballistic properties and mechanical performance. Aiming to enhance the fiber−matrix interface, an alkali treatment was proposed. The group conditions were divided into three NaOH concentrations (3%, 5%, and 10%), as well as the three periods of immersion (24, 48, and 72 h). Therefore, nine different conditions were investigated in terms of their thermal behaviors, chemical structures, physical structures, and morphological aspects. Based on TGA curves, it could be noticed that treatments related to 3% NaOH for 24 h and 48 h exhibited better thermal stability properties. For the time of 48 h, better thermal stability with for a decay of the thermal DSC curve was shown for all treatment conditions. The FTIR spectra has shown a reduction of waxes for higher NaOH concentrations. The XRD diffractogram exhibited an increase in the crystallinity index only for 5% NaOH and an immersion time of 48 h. The morphological aspects of fibers treated with 5% and 10% of NaOH have shown that the treatments have damaged the fiber, which highlighted the crystallinity index reductions.

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Adaptive response of rare mountain sedge (Carex Ecostata C.B. Clarke) to hyper-cold environments

Asghar,

Ameer,

Ahmad

et al. 2024

Plant Soil

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Dynamic mechanical and thermal mechanical analysis of Cyperus malaccensis sedge fiber reinforced GO-incorporated epoxy nanocomposites: a short communication

Cited by 8 publications

References 43 publications

Ethylene Scavenging Films Based on Ecofriendly Plastic Materials and Nano-TiO2: Preparation, Characterization, and In Vivo Evaluation

Ethylene Scavenging Films Based on Ecofriendly Plastic Materials and Nano-TiO2: Preparation, Characterization, and In Vivo Evaluation

Alkaline Treatment Investigation for Sedge Fibers (Cyperus malaccensis): A Promising Enhancement

Adaptive response of rare mountain sedge (Carex Ecostata C.B. Clarke) to hyper-cold environments

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