Influence of the molecular weight of ethylene vinyl acetate copolymers on the flow and mechanical properties of uncompatibilized polystyrene/ethylene-vinyl acetate copolymer blends

Tang, Lei; Tam, Kam Chiu; Yue, Chee Yoon; Hu, Xiao; Lam, Yee Cheong; Li, L

doi:10.1002/1097-0126(200101)50:1<95::aid-pi591>3.0.co;2-7

Cited by 8 publications

(3 citation statements)

References 26 publications

(30 reference statements)

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“…The reduction in strength is more significant when stearic acid is added to low molecular weight polymers. Tang et al made an explanation, that shorter polymer chains decrease the chance for chain entanglement and have lower amount of 'tie molecules' bridging between particles [30].…”

Section: Shapingmentioning

confidence: 99%

Ethylene vinyl acetate as a binder for additive manufacturing of tricalcium phosphate bio-ceramics

Gorjan

Reiff

Liersch

et al. 2018

Ceramics International

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Tricalcium phosphate (TCP) ceramic scaffolds were made by the fused filament fabrication (FFF) using different grades of Ethylene Vinyl Acetate (EVA) as a thermoplastic binder. Stearic acid was studied as a processing aid. A wide range of rheological properties, shaping and debinding behavior could be observed with feedstocks made with different EVA grades. The addition of stearic acid affects flexibility of the solid filaments, the viscosity of feedstocks, and causes a pronounced yield stress behavior. These effects are strongly dependent on the molecular weight of the EVA and influence the printing process and shape stability during the debinding process. EVA binder system works well for thin and small parts, made with nozzle sizes below 0.4 mm, whereas samples made by thicker nozzle size form defects during debinding process. TCP scaffold structures with fin struts of 0.27 mm and partition wall thickness of 0.25 mm and a layer thickness of 0.20 mm could be successfully shaped, debinded and sintered. Excellent fusion between the different layers was achieved, since no defects at the interface could be detected.

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Section: Shapingmentioning

confidence: 99%

Ethylene vinyl acetate as a binder for additive manufacturing of tricalcium phosphate bio-ceramics

Gorjan

Reiff

Liersch

et al. 2018

Ceramics International

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“…Brittle polymers such as polystyrene (PS) can be converted into high-impact materials by the addition of a rubbery material. 3 PS has been toughened by blending with rubbers such as styrene–butadiene (SBR), 4 natural rubber (NR), 5 polybutadiene (BR), 6 ethylene-propylene-dieneterpolymer (EPDM), 7 nitrile rubber (NBR), 8 and so on. It is generally accepted that the rubber particles in the PS/rubber blend work as stress concentrators to initiate a massive number of crazes in the PS matrix.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, thermal, and rheological properties of dynamically vulcanized natural rubber-toughened polystyrene

Gopalakrishnan

Kutty

2013

Journal of Elastomers & Plastics

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Dynamically vulcanized blends of 85/15 polystyrene (PS)/natural rubber (NR) were prepared by melt mixing in an internal mixer at I70°C using dicumyl peroxide (DCP). The concentration of DCP was varied from 0 to 4.2 milliequivalents (meq). It was found that dynamic vulcanization of the blend with 2.8 meq DCP significantly enhanced the Young's modulus, flexural modulus, and impact strength, with a marginal improvement in tensile and flexural strengths. The SEM studies revealed that the morphology of the blends changed drastically on dynamic vulcanization. The dynamic mechanical studies showed that the storage modulus and the loss modulus were better for dynamically vulcanized blends with 2.8 meq DCP in comparison to other blends. The rheology studies reveal that the damping of the blend was reduced at the melt processing conditions at a DCP content of 2.8 meq and the blend was pseudoplastic in nature. The thermal stability of the dynamically vulcanized blend improved on dynamic vulcanization. Thus, dynamic vulcanization can be employed as a means of technological compatibili-zation technique for 85/15 PS/NR blend for overall improvement in properties.

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“…Shin et al [13] reported the viscoelastic properties of EVA-based HMAs for the miscible and immiscible. Tang et al [14] reported that the mechanical properties increased as the molecular weight of EVA increased in EVA copolymer/polystyrene blends. Varghese et al [15] showed that tensile strength, elongation at break, Young's modulus, tear strength, and hardness increased as the amount of EVA increased in acrylonrile butadiene rubber/EVA blends.…”

Section: Introductionmentioning

confidence: 99%

Development of hot melt adhesive pad and its application to polishing of monocrystalline silicon

Tsai

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part B:

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This study has developed a new polishing pad and an accompanying group of parameters for polishing monocrystalline silicon. A hot melt adhesive polishing pad coated with SiC abrasive uses these parameters more effectively and provides better polishing quality when compared with a conventional wool pad. Three control parameters, feed rate, polishing load and turning speed of the polishing wheel, were tested to identify their impact on the polishing quality of the silicon surface. A silicon surface polished with the proposed new pad under optimum conditions can obtain surface roughness of 2.45 nm Ra with mirror-like appearance.

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Influence of the molecular weight of ethylene vinyl acetate copolymers on the flow and mechanical properties of uncompatibilized polystyrene/ethylene-vinyl acetate copolymer blends

Cited by 8 publications

References 26 publications

Ethylene vinyl acetate as a binder for additive manufacturing of tricalcium phosphate bio-ceramics

Ethylene vinyl acetate as a binder for additive manufacturing of tricalcium phosphate bio-ceramics

Mechanical, thermal, and rheological properties of dynamically vulcanized natural rubber-toughened polystyrene

Development of hot melt adhesive pad and its application to polishing of monocrystalline silicon

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