Physicomechanical, friction, and abrasion properties of EVA/PU blend foams foamed by supercritical nitrogen

Zhang, Zhen Xiu; Zhang, Tao; Wang, Dan; Zhang, Xin; Xin, Zhenxiang; Prakashan, K.

doi:10.1002/pen.24598

Cited by 34 publications

(39 citation statements)

References 45 publications

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“…The cross-sectional morphology of the foam was observed using a Philips XL 30S scanning electron microscope (SEM) and average cell size was investigated using the ImageJ software from the SEM images. Cell density was calculated following the method described in our previous article [15]. The tensile, tear, and uniaxial compression test were performed using a universal tester (Gotech, Taiwan) at an extension speed of 500 mm·min -1 and a constant compression rate of 10 mm·min -1 for 50% compression strain respectively.…”

Section: Characterizationmentioning

confidence: 99%

“…Because of environment-friendliness and adjustable solvent property, supercritical fluids such as CO 2 and N 2 have been widely used as physical blowing agents for the production of polymer foams with a substantial improvement over the conventional foam manufacturing techniques [13,14]. Because of the slower diffusion rate, supercritical N 2 (SC N 2 ) is preferable than the supercritical CO 2 (SC CO 2 ) to obtain elastomeric foams with improved cell morphology [15]. Although a number of microcellular foams have been produced from TPE successfully, the limited expansion level (i.e.…”

mentioning

confidence: 99%

“…The latter is preferably advantageous because a chemical residue free, controlled crosslinking can be achieved by controlling the applied irradiation dose (ID) [32]. There are plenty of articles in the literature regarding crosslinked TPE foams from polymer or polymer blend [15,[33][34][35][36][37], such as EVA, PU/EVA blend, PVC/TPU blend, NR/EVA blend, etc. During the processing of polymeric foams, irradiation crosslinking can broaden the temperature window for the SCF foaming, and improve cell morphology of the foams with high volume expansion ratio [38][39][40].…”

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confidence: 99%

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A developed, eco-friendly, and flexible thermoplastic elastomeric foam from SEBS for footwear application

Zhang¹,

Dai²,

Zou³

et al. 2019

Express Polym. Lett.

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In search of new materials to develop comfortable shoe sole, nowadays the researchers have resorted to the thermoplastic elastomers (TPEs) usually used as cushioning materials for its easy processability and adorable physical properties that can meet both the comfort as well as other functional requirements (i.e. fashion, ultralight, aging, etc.). TPEs are a class of copolymers or physical mixes of polymers and have the morphology of non-miscible blends of elastomer and thermoplastic matrix simultaneously. Low or room temperature elastomeric behavior and high temperature processablitiy makes TPE as a suitable material for developing lightweight and recyclable microcellular foams [1]. Most of the commercial TPE foams for footwear application are developed either from thermoplastic polyurethane (TPU) or ethylenevinyl acetate (EVA) copolymer in which the soft matrix provides sufficient free space for gas absorption whereas the rigid matrix prevents the gas diffusion during foaming process [2][3][4][5][6]. Styrene-(ethylene-cobutylene)-styrene polymers (SEBS) derived from the hydrogenation of styrene-butadiene-styrene (SES) polymers is a typical TPE which shows a better weather resistance, lower compression set, lower density, etc., can be a potential alternative of TPU or EVA [7,8]. SEBS consists of a soft midblock of ethylene-butylene (E-co-B) and hard end-blocks of 948 Abstract. Developing eco-friendly, flexible thermoplastic elastomeric foams based on poly(styrene-(ethylene-co-butylene)styrene) (SEBS) is a challenging task because of its poor melt strength. A promising approach to overcome this challenge is the use of synergistic technologies, such as combination of irradiation, supercritical fluid foaming, and steam-chest molding technologies. Herein, foamed beads were produced from pre-crosslinked SEBS beads using supercritical nitrogen as blowing agent, followed by subsequently efficient steam-chest molding to obtain midsole part. The crosslinking was accomplished under the assistance of electron beam. The rheology properties and foaming behavior reveals that the viscosity and modulus of the matrix increase with the increase of crosslinking resulting from increasing the irradiation dose (ID). With increasing the ID, successful foaming with larger expansion and improved cell morphology was achieved. SEBS bead foams were successfully obtained from 65 kGy-derived pre-crosslinked beads through steam-chest molding which showed a specific gravity of 0.252 g·cm -3 and comparable/superior mechanical properties to/than that of commercial thermoplastic polyurethane (TPU) or ethylene-vinyl acetate copolymer (EVA) foams. Especially, the higher elasticity and resilience of SEBS foams meet well the desirable properties for footwear application which supports SEBS to be an alternative for TPU or EVA.

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Section: Characterizationmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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A developed, eco-friendly, and flexible thermoplastic elastomeric foam from SEBS for footwear application

Zhang¹,

Dai²,

Zou³

et al. 2019

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

“…It is strictly influenced the properties due to the presence of the heterogeneous network structure with densely crosslinked region and loosely crosslinked one, such as low tensile and tear strength. That is all as well as its physical and chemical properties, which easily leads to its unsatisfactory wear resistance [7][8][9][10]. Thus, the oil resistance is still not high enough despite of the high VA content in EVM [11].…”

Section: Introductionmentioning

confidence: 99%

Wear resistance, oil resistance, morphology and vulcanization performances of ethylene-vinyl acetate/acrylonitrile butadiene rubber composites

Wang¹,

He²,

He³

et al. 2019

Express Polym. Lett.

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The composites consisting of ethylene-vinyl acetate rubber (EVM) and acrylonitrile butadiene rubber (NBR) were prepared by two-step blending method, and were reinforced with carbon black (CB) using 1,4-bis(tert-butylperoxyisopropyl) benzene (BIPB) as crosslinking agent. In addition, wear and oil resistance, morphology, vulcanization and dynamic mechanical properties of the composites were systematically investigated. 3D graph was used to analyze the trend of wear and oil resistance of the composites. SEM images showed that the wear mechanism of the composites was mainly abrasive wear, accompanied by fatigue wear. With the increase of NBR content, the wear resistance was effectively improved, which was revealed by the DIN abrasion volume, worn surfaces morphology and roughness. Meanwhile, the oil resistance was also improved according to the rate of volume change and surface contact angle. The EVM/NBR composites prepared by the two-step blending method showed higher ΔH (maximum torque M H-minimum torque M L) than pristine EVM or NBR did. The composites containing 30 phr of CB exhibited excellent wear and oil resistance, which broadened the applications field of the EVM/NBR composites.

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“…The syntactic foams have attracted considerable attention due to their low density, high specific strength, good sound absorption, and thermal insulation . Therefore, they are widely used in marine, acoustic and aerospace applications . Usually, the matrix of syntactic foams are polymer binders, such as epoxy resin, phenolic resin, vinyl ester, silicone rubber, HDPE, polyurethane resin.…”

Section: Introductionmentioning

confidence: 99%

Effect of high‐temperature treatment on the mechanical and thermal properties of phenolic syntactic foams

Huang

Zhang

Wang

2018

Polymer Engineering & Sci

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Phenolic syntactic foams were prepared with phenol–formaldehyde resin (PF), p‐toluene sulfonic acid, γ‐aminopropyltriethoxysilane (APTES), and glutaraldehyde (GA) cooperative treated hollow glass microsphere (HGM). Five types of syntactic foams were fabricated by filling different content of modified HGM. Compressive, flexural and thermal properties of the foams were investigated with respect to HGM content and treated temperature. Thermogravimetric analysis (TGA) studies presented a considerable reduction in the weight loss rate of system with the addition of HGM, the residual weight of syntactic foam with 50 vol% HGM at 800°C is 72.45%. Compression and bending tests results showed an increase on compressive and flexural properties for syntactic foams treated at high temperature with increasing HGM volume fraction. The thermal conductivity of all syntactic foams increased with temperature while decreased with introducing HGM, and thermal conduction through solid phase was the main heat transfer approach. The incorporation of HGM was beneficial to improving the thermal insulation property of syntactic foams especially at high temperatures. POLYM. ENG. SCI., 58:2200–2209, 2018. © 2018 Society of Plastics Engineers

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Physicomechanical, friction, and abrasion properties of EVA/PU blend foams foamed by supercritical nitrogen

Cited by 34 publications

References 45 publications

A developed, eco-friendly, and flexible thermoplastic elastomeric foam from SEBS for footwear application

A developed, eco-friendly, and flexible thermoplastic elastomeric foam from SEBS for footwear application

Wear resistance, oil resistance, morphology and vulcanization performances of ethylene-vinyl acetate/acrylonitrile butadiene rubber composites

Effect of high‐temperature treatment on the mechanical and thermal properties of phenolic syntactic foams

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