Comparative study between poly(ethylene-co-vinyl acetate) - EVA expanded composites filled with banana fiber and wood flour

Zimmermann, Matheus Vinícius Gregory; Turella, Taís Caroline; Santana, Ruth Marlene Campomanes; Zattera, Ademir J.

doi:10.1590/1516-1439.269814

Cited by 9 publications

(6 citation statements)

References 28 publications

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“…This energy minimization gives place cell coalescence during the foaming process, yielding foams with bigger cell size and low ρ. The density of the foams increases at higher AF p and AF m contents (12 and 15 wt.%); it is due to three factors: (i) the higher loading of the fibers with a density of 1.486 g/cm 3 , it is higher than the blend polymers [6]; (ii) the increment of the number of cells (nucleant effect); and (iii) because the viscosity and GF are higher at higher AF contents such as is observed in Figure 2(b), it last restricts the cell expansion and the density is increased [6,32,33]. Figure 2(b) shows the GF (the insoluble fraction of the polymer foam) of foam composites containing different weight contents of AF p and AF m .…”

Section: Density and Gelmentioning

confidence: 99%

Influence of Ethylene Plasma Treatment of Agave Fiber on the Cellular Morphology and Compressive Properties of Low-Density Polyethylene/Ethylene Vinyl Acetate Copolymer/Agave Fiber Composite Foams

Soriano‐Corral¹,

Calva-Nava²,

Hernández-Gámez³

et al. 2021

International Journal of Polymer Science

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Agave fibers (AF) were incorporated either pristine (AFp) or surface treated by ethylene plasma (AFm) in low-density polyethylene (LDPE)/ethylene vinyl acetate (EVA) blends at a ratio of 1 : 1 and foamed by chemical means. The role of the AF content (3, 6, 9, 12, and 15 wt.%) and its surface modification on the cellular morphology and mechanical properties of LDPE/EVA/AF foams under compression is investigated herein. Fourier transform-infrared spectroscopy, contact angle, and water suspension of AF suggest that plasma treatment using ethylene successfully modifies the surface nature of AF from hydrophilic to hydrophobic. AF and the surface treatment have an important role on the morphological properties of the foams. Composite foams reinforced with 12 wt.% AFm exhibited the highest mechanical properties improvements. At this fiber content, the composite foams enhanced 30% of the compressive modulus and 23% of the energy absorption under compression with respect to the neat polymer blend foam, as a result to the formation of more uniform cells with smaller size and the enhancement of compatibility and spatial distribution of the AFm in the polymer composite foams due to thin clusters of polyethylene-like polymer deposited on the AF surface.

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Section: Density and Gelmentioning

confidence: 99%

Influence of Ethylene Plasma Treatment of Agave Fiber on the Cellular Morphology and Compressive Properties of Low-Density Polyethylene/Ethylene Vinyl Acetate Copolymer/Agave Fiber Composite Foams

Soriano‐Corral¹,

Calva-Nava²,

Hernández-Gámez³

et al. 2021

International Journal of Polymer Science

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“…In ideal situation, development of footwear foams with eco additives will enhance the mechanical and functional properties. One study claimed that the addition of wood flour and banana fiber in EVA polymeric expanded composites compressive and tear strength increases gradually with increasing amount of either of the additives 2 . Addition of different natural or recycled synthetic rubbers to EVA foams provides better elasticity, cushioning and lead to cost reduction of composite materials for footwear 3–5 …”

Section: Introductionmentioning

confidence: 99%

Impact of hollow glass microsphere addition to poly(ethylene vinyl) acetate foam on mechanical properties of sports footwear

Lunchev

Kashcheev²,

Tok

et al. 2023

J of Applied Polymer Sci

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Samples of ethylene vinyl acetate (EVA) co‐polymer foams in form of plates and industrial outsoles of prototyped sport shoes containing 0% (reference), 2.5%, and 5.0 weight % (wt%) of hollow glass microspheres (HGM) were made. The goal was to study the influence of HGM on properties of EVA foam in laboratory conditions followed by the industrial trial, where the most promising laboratory result was applied. The physical properties of samples and behavior of material under dynamic load were examined. EVA foams with HGM filler demonstrated that they have better ability to reduce impact peak force and increase absorb impact impulse compared to the reference foam without HGM. Addition of 5.0 wt% of HGM in laboratory foam increased its absorbed impact pulse by two‐fold. Meanwhile for industrial prototype outsoles, the impact peak force was reduced by 5%–7% in walking simulated conditions and by 11% in case of simulated running. It is also observed that, addition of 5.0 wt% of HGM in EVA foam increased its abrasion resistance by three times, which generally helps to increase the lifetime of sport footwear. Under dynamic load, samples with the addition of HGM behave interestingly and result shows a small decrease in energy return (7%) which is logical, because this composite tends to absorb energy and not return it. Samples with 2.5 wt% HGM are stiffer than reference until 40% compression deformation, but beyond that point it becomes softer, and better absorbs impact energy than reference. Outsole with 2.5% of HGM in EVA outsole increased resistance of shoe at lateral bending of 50% and 20% rise of resistance was found at medial twist. Impact absorption and flexibility resistance are useful for protection against impact which are also helpful to prevent sport injuries. The obtained results show the addition of HGMs which are cheap by‐products in several technologies brings improvement to properties of EVA foams which is the most common materials for the sport footwear industry.

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“…The choice of the blowing agent should be based on the polymer structure. If an EVA matrix is used, a suitable option for the blowing agent can be azodicarbonamide (ADCA) 30,31 . Using ADCA, achieving a proper balance between the curing and the decomposition rate would be easier.…”

Section: Introductionmentioning

confidence: 99%

“…If an EVA matrix is used, a suitable option for the blowing agent can be azodicarbonamide (ADCA). 30,31 Using ADCA, achieving a proper balance between the curing and the decomposition rate would be easier. So, in this paper, it will be utilized as the blowing agent.…”

Section: Introductionmentioning

confidence: 99%

Development of optimal polymeric foams with superior sound absorption and transmission loss

Nourmohammadi

Jahanmardi

Moeenfard

et al. 2022

J of Applied Polymer Sci

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The objective of the current research is to propose new polymer composites with optimal acoustic properties. To do so, the ethylene‐vinyl acetate foam is employed as the based polymer and the nano silica, nano clay and graphene nanoplatelets are used as extra ingredients. The appropriate amounts of the blowing agent and nano materials are determined using the Taguchi design technique. Using the L9(34) Taguchi array, different foams are manufactured and their specifications are determined experimentally. Most importantly, the sound absorption and transmission loss of the foams are measured and utilized to specify their noise reduction coefficient (NRC) as well as their average transmission loss (ATL). To maximize the NRC and ATL, optimal formulations are derived based on the Taguchi method. Then the optimal foams are manufactured to characterize their acoustic properties. Experimentations show that both NRC and ATL are respectively improved by 9.76% and 7.98% compared to the best NRC and ATL record of the samples of the Taguchi table. Some new samples with at most one nano material are also produced to study the synergistic effects of the nano materials. Measurements of the acoustic properties of these foams revealed that the combination of the nano materials offers superior acoustic properties.

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Comparative study between poly(ethylene-co-vinyl acetate) - EVA expanded composites filled with banana fiber and wood flour

Cited by 9 publications

References 28 publications

Influence of Ethylene Plasma Treatment of Agave Fiber on the Cellular Morphology and Compressive Properties of Low-Density Polyethylene/Ethylene Vinyl Acetate Copolymer/Agave Fiber Composite Foams

Influence of Ethylene Plasma Treatment of Agave Fiber on the Cellular Morphology and Compressive Properties of Low-Density Polyethylene/Ethylene Vinyl Acetate Copolymer/Agave Fiber Composite Foams

Impact of hollow glass microsphere addition to poly(ethylene vinyl) acetate foam on mechanical properties of sports footwear

Development of optimal polymeric foams with superior sound absorption and transmission loss

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