Physical properties of ethylene vinyl acetate copolymer (EVA)/natural rubber (NR) blend based foam

Kim, Min‐Su; Park, Cha-Cheol; Chowdhury, Subhendu Ray; Kim, Gue‐Hyun

doi:10.1002/app.21174

Cited by 57 publications

(38 citation statements)

References 3 publications

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“…The melt processing of EVA was performed using a HAAKE minilab, which combines key features of batch mixers, twin-screw extruders, and rheometers. A series of specimens with variant processing time (5,15,20,25,30, and 35 min) were processed at 200°C, 50 rpm in HAAKE minilab. And all samples for dynamic mechanical analysis (DMA) and positron annihilation lifetime spectroscopy (PALS) analysis were obtained on a microinjection molding machine (Thermo Electron Corp.).…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

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Property of ethylene vinyl acetate copolymer in melting processing

Chen

Fang

Wang

et al. 2006

J of Applied Polymer Sci

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ABSTRACT:The study is focused on the processing behavior of poly(ethylene-co vinyl acetate) (EVA) in high temperature, such as 200°C. The specimens are characterized using HAAKE minilab, dynamic mechanical analysis (DMA), and positron annihilation lifetime spectroscopy (PALS) to understand the rheological behavior and microstructure of EVA. It was concluded that in high processing temperature, the viscosity declined first and then increased. The PALS results showed that the free volume of EVA became large at the beginning, and became small afterwards. The glass transition temperature measured with DMA got lower at first and then nearly unchanged with increasing handling time. The results can be explained that the degradation of EVA prevailed, and then degradation was not dominant. A good correlation has been found between the processing time and temperature of the transition point in the viscosity curve.

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Section: Materials and Sample Preparationmentioning

confidence: 99%

“…Attarian et al 2 reported that the viscosity is expressed in familiar Arrhenius form with constant activation energy, whose value depends on the chemical structure of the polymer blend. Kim et al 5 studied the correlation between crosslinking behavior and physical properties of foams.…”

Section: Introductionmentioning

confidence: 99%

Property of ethylene vinyl acetate copolymer in melting processing

Chen

Fang

Wang

et al. 2006

J of Applied Polymer Sci

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“…Natural rubber foam (NRF) is the sponge rubber that has been used in many industries due to its light weight, excellent thermal insulation, and sound absorption . Among several techniques to produce rubber foam , the addition of thermally decomposable chemical blowing agent is applicable for producing NRF specimen by the compression molding process because chemical blowing agent can be mixed with other compounding ingredients before shaping the rubber foam specimen in the mold.…”

Section: Introductionmentioning

confidence: 99%

Effect of graphene treated with cyclohexyl diamine by diazonium reaction on cure kinetics, mechanical, thermal, and physical properties of natural rubber/graphene nanocomposite foam

Charoeythornkhajhornchai

Samthong

Somwangthanaroj

2018

Polymer Composites

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The influence of functionalization of cyclohexyl diamine onto the graphene surface via diazonium reaction on the cure kinetics as well as morphology, mechanical, thermal and physical properties of natural rubber (NR)/graphene nanocomposite foam was investigated. The surface functionalization of graphene was confirmed by Fourier transform infrared spectroscopy, Raman spectroscopy, and thermogravimetric analysis (TGA). Without an addition of blowing agent, the vulcanized NR composites containing cyclohexyl amine‐treated graphene showed not obvious different dispersion of graphene nanoplatelets than those containing untreated graphene as confirmed by transmission electron microscopy micrographs. Although the addition of untreated graphene could accelerate the sulfur vulcanization rate of NR nanocomposite foam due to the high thermal conductivity of graphene particle, and the remaining oxygen functional groups on the surface of graphene, the amines from cyclohexyl diamine on the treated graphene could react with carboxylic and epoxide group on the surface of graphene leading to a reduction of reactive oxygen functional groups on graphene surface and in turn slowed vulcanization rate. The fast vulcanization rate in untreated graphene system led to small bubble size in the NR nanocomposite foams. In contrast, the treated graphene system showed high tensile strength and low thermal expansion coefficient owing to low cell density. Finally, the defect on the graphene surface after functionalization was detected by Raman spectroscopy; this resulted in poor thermal conductivity for the treated graphene composite system. POLYM. COMPOS., 40:E1766–E1776, 2019. © 2018 Society of Plastics Engineers

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“…Elastomeric foams are important in the man-made world; the reasons are both technical and commercial. From a tech-nical point of view, a variety of properties such as low density, chemical resistance and inertness, buoyancy, good aging, cushioning performance, thermal and acoustic insulation, and ability to be recycled, have ensured that polymeric foams have penetrated the automotive and transport, building and construction, marine, medical, sports, and leisure markets [3,4]. Fire hazards associated with the use of these polymeric foams, which result in the loss of life and property, are of particular concern among government regulatory bodies, consumers and manufacturers alike [1,2].…”

Section: Introductionmentioning

confidence: 99%

Flame resistance and foaming properties of NBR compounds with halogen‐free flame retardants

Moon

Farris

2009

Polymer Composites

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Acrylonitrile butadiene rubber (NBR) foams compounded with various halogen-free flame retardants were prepared. The influence of nonhalogen flame retardants on the flame resistance and foaming properties of the NBR compounds were investigated. The foaming properties (expandability 980%-1050%, closedcell structure) of NBR compounds with expandable graphite (EG) and ammonium polyphosphate (APP) flame retardants were similar to the NBR base compounds which contained primarily aluminum hydroxide (ATH). The heat release capacity (HRC) ranged from 10 to 74 J/g-K, the average heat release rate (A-HRR) ranged from 8 to 60 kW/m 2 , and the total heat release (THR) ranged from 2.6 to 7.3 MJ/m 2 for the nonhalogenated NBR foams with closed-cell structure and were significantly decreased upon increasing the amounts of flame retardants. This reduction is attributed to the hard char formation and production of water from the interaction with ATH. The limiting oxygen index (LOI) and time to ignition (TTI) show opposite results. The smoke density (0.050-0.037) of the NBR foams with EG flame retardant was decreased when compared to the NBR foam (0.107). The EG flame retardant was more effective than the phosphorus/nitrogen flame retardants in reducing the HRR and smoke density. The use of both ATH and EG is very effective in improving flame resistance.

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Physical properties of ethylene vinyl acetate copolymer (EVA)/natural rubber (NR) blend based foam

Cited by 57 publications

References 3 publications

Property of ethylene vinyl acetate copolymer in melting processing

Property of ethylene vinyl acetate copolymer in melting processing

Effect of graphene treated with cyclohexyl diamine by diazonium reaction on cure kinetics, mechanical, thermal, and physical properties of natural rubber/graphene nanocomposite foam

Flame resistance and foaming properties of NBR compounds with halogen‐free flame retardants

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