Formation of Vinylidene in Polypropylene/Ethylene Vinyl Acetate (PP/EVA) Blends During Degradation

Alothman, Othman Y.; Salahudeen, Shafaat Ahmed; Elleithy, Rabeh; Al-Zahrani, S.M.

doi:10.1080/03602559.2012.654578

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…To simply demonstrate the effect of vinyl acetate content, the carbonyl index was calculated from the ratio of intensities at 1734 cm À1 /1460 cm À1 . [40][41][42] It is clear that this ratio is proportionally increased with the vinyl acetate content of the membranes (Figure 6). The carbonyl index implies the number of polar carbonyl group in the polymeric structure.…”

Section: Physicochemical Properties Of the Membranementioning

confidence: 91%

AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification

Watasit

Rukchonlatee

Ausavasukhi

et al. 2021

J of Applied Polymer Sci

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The CO 2 and CH 4 permeabilities of poly(ethylene-co-vinyl acetate) (EVA)/ SiO 2 composite membrane were investigated at atmospheric pressure. The membranes were fabricated by compression molding and characterized by Fourier transformed infrared spectroscopy, differential scanning calorimetry, a universal testing machine, and a contact angle analyzer. The effect of vinyl acetate content (18-33 wt%) was evaluated for both single-gas and mixed-gas permeation systems. A non-pressurized homemade-permeation cell was used for the single-gas permeation of CO 2 and CH 4 , while a tubular membrane was utilized for a continuous separation of CO 2 /CH 4 mixture. CO 2 flux was readily increased (from 0.7 to 2.0 ml/m 2 .s) with vinyl acetate content (18-33 wt%). The enhanced CO 2 permeability is attributed to the increase in polarity and also the decrease in crystallinity of the membrane. A satisfied gas separation selectivity (CO 2 /CH 4 ) of 4.31 could be obtained from tubular membrane with 28 wt% VA content. The incorporation of SiO 2 as a filler (0.5-2.0 wt%) especially increased the membrane polarity and hence the CO 2 flux up to 6.0 ml/m 2 .s. However, the CH 4 flux was not affected by VA and SiO 2 contents.

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Section: Physicochemical Properties Of the Membranementioning

confidence: 91%

AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification

Watasit

Rukchonlatee

Ausavasukhi

et al. 2021

J of Applied Polymer Sci

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“…7,8 Ethylene-vinyl acetate (EVA) is a low-cost copolymer used as an elastomer to improve the fracture properties of PP. 9,10 Numerous papers have examined the effect of EVA on PP, for example, Dikobe et al showed that combining PP and EVA reduced the elongation at break and tensile modulus. Ying et al 11 showed that by adding EVA to the PP matrix, the impact strength and elongation at break increased, but Young’s modulus decreased.…”

Section: Introductionmentioning

confidence: 99%

Multi-response optimization of tensile and fracture properties of polypropylene/ethylene-vinyl acetate/exfoliated graphite by the design of experiment

Rajaee

Ghasemi

Fasihi

et al. 2022

Journal of Elastomers & Plastics

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Thermoplastic elastomeric nanocomposites have a wide range of applications in the automotive, medical, electronics, and energy sectors. Good mechanical and fracture performances are typically needed to reach the desired properties for the applications. In this study, tensile and fracture properties of exfoliated graphite (EG) filled PP toughened with ethylene-vinyl acetate (EVA) are examined. Accordingly, four levels of EVA (0, 10, 20, and 30 wt.%) and EG (0, 1, 3, and 5 wt.%) are utilized. The full factorial design is employed to explain the effect of independent parameters and their interaction on responses. The essential work of fracture (EWF) methodology is also employed to investigate the fracture behavior of the blend nanocomposites. By increasing EVA, the elongation at break and non-EWF are increased by 188% and 75%, in succession. Moreover, the tensile modulus is improved up to 11% by increasing EG. The compound with 10 wt.% EVA and 1 wt.% EG has the best toughness-strength-stiffness balance based on the optimization results.

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“…And the impact strength and breaking elongation were continuously promoted with the increasing EVA concentration. Besides, Alothman et al . took PP/EVA blends for radiation degradation study and found that the most pronounced effect of radiation was associated with oxidative degradation.…”

Section: Introductionmentioning

confidence: 99%

The observation of PP/EVA blends in which isotactic PP was preradiated with different radiation absorbed doses

Zhang

Li²,

Shen

et al. 2017

J of Applied Polymer Sci

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Isotactic polypropylene (PP) was preradiated by γ ray with different absorbed doses and subsequently blended with ethylene‐vinyl acetate (EVA) co‐polymer to prepare PP/EVA blends. The average molecular weight (Mn) of isotactic PP decreased with the increasing radiation absorbed dose, which indicated that high energy radiation of γ ray broke the isotactic long PP chains into shorter ones. The melt flow rate results evidenced that the processing ability of PP/EVA blends was continuously promoted with the increasing absorbed dose. The β crystal was obtained in the PP/EVA blends by the radiation method. The onset temperatures and peaks of crystallization of PP/EVA blends decreased slightly with the increasing radiation absorbed dose, while high energy radiation was inclined to enhance the crystallinity of PP/EVA blends. The Fourier transform infrared spectroscopy (FTIR) tests confirmed an interesting phenomenon that PP tended to move to the surface of the PP/EVA blends with the increasing radiation absorbed dose. Mechanical tests proved that the PP/EVA blends remained a comparative stable mechanical property under the absorbed dose of 30 kGy. The experimental results indicated that PP/EVA blend was a potential candidate for industrial applying. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45057.

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Formation of Vinylidene in Polypropylene/Ethylene Vinyl Acetate (PP/EVA) Blends During Degradation

Cited by 6 publications

References 28 publications

AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification

AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification

Multi-response optimization of tensile and fracture properties of polypropylene/ethylene-vinyl acetate/exfoliated graphite by the design of experiment

The observation of PP/EVA blends in which isotactic PP was preradiated with different radiation absorbed doses

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Formation of Vinylidene in Polypropylene/Ethylene Vinyl Acetate (PP/EVA) Blends During Degradation

Cited by 6 publications

References 28 publications

AtmosphericCO2/CH4permeability ofEVAcopolymer/SiO2composite membrane for biogas purification

AtmosphericCO2/CH4permeability ofEVAcopolymer/SiO2composite membrane for biogas purification

Multi-response optimization of tensile and fracture properties of polypropylene/ethylene-vinyl acetate/exfoliated graphite by the design of experiment

The observation of PP/EVA blends in which isotactic PP was preradiated with different radiation absorbed doses

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AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification

AtmosphericCO₂/CH₄permeability ofEVAcopolymer/SiO₂composite membrane for biogas purification