Effects of crystallinity and crosslinking on the thermal and rheological properties of ethylene vinyl acetate copolymer

Sung, Youngje; Kum, C.K.; Lee, Heon Sang; Kim, J.S.; Yoon, Ho Gyu; Kim, W.N.

doi:10.1016/j.polymer.2005.09.080

Cited by 97 publications

(74 citation statements)

References 19 publications

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“…It has been reported 16 that the storage modulus below the glass transition region can be hardly affected by changing the crystallinity of the polymer. Since storage modulus above À50 C depends on crystallinity, it enhances by reduce of VA content (see Fig.…”

Section: Sem Imagesmentioning

confidence: 99%

Effect of irradiation on mechanical and structural properties of ethylene vinyl acetate copolymers hollow fibers

Khodkar

Ebrahimi

2010

J of Applied Polymer Sci

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Effect of irradiation on mechanical and structural properties of ethylene vinyl acetate copolymers (EVA) hollow fibers was studied by the tests such as determination of gel content, density, tensile, FTIR, SEM, and DMA. These effects were discussed based on dose and irradiation environment. The results of gel content depicted that irradiated EVA in ambient conditions had tendency to chain scission while the crosslinking overcame in irradiated samples under nitrogen. Density insignificantly enhanced with irradiation dose. In tensile test, irradiation induced increase in tensile strength and decrease in elongation at break (especially in samples irradiated in nitrogen). Also, changing in layer orientation could be observed by SEM images. In addition, irradiation caused altering peak intensity in FTIR spectrum. DMA results demonstrated that irradiation broaden the elastic zone. Totally, irradiation enhances features especially in irradiated EVA18 in nitrogen. Since, according to stabilization of induced deformation and improvement of mechanical properties (that created by radiation), the irradiated samples can be used in different applications.

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Section: Sem Imagesmentioning

confidence: 99%

Effect of irradiation on mechanical and structural properties of ethylene vinyl acetate copolymers hollow fibers

Khodkar

Ebrahimi

2010

J of Applied Polymer Sci

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“…Many researchers have shown that the thermal, mechanical and rheological properties of various thermoplastics and thermoplastic elastomers can be improved by the addition of a small amount of organic peroxide in a molten state [1][2][3][4][5] . For example, Ramos et al 1 investigated peroxide-induced slightly crosslinked linear low density polyethylene (LLDPE) by using dicumyl peroxide (DCP) in molten state.…”

Section: ⅰ Introductionmentioning

confidence: 99%

“…García-quesada et al 4 reported that mechanical properties at evaluated temperature and thermal stability of unplasticized poly(vinyl chloride) (PVC) were enhanced by slightly crosslinking with 1,1-di-t-butylperoxy-3,3,5-trimethyl cyclohexane peroxide and trimethylolpropane trimethacrylate in a molten state. Sung et al 5 examined slightly crosslinked ethylene vinyl acetate copolymer induced by a small amount of DCP in molten state and found that storage modulus is increased and crystallinity is decrease by crosslinking. Kim et al 6 reported that the adhesion properties of poly(styrene-b-butadiene-b-stryene) (SBS) can be improved after the polybutaidene (PB) block was crosslinked with trimethylolpropane tris(3-mercaptopropionate) (TRIS) and benzophenone (BP) with the aid of UV irradiation.…”

Section: ⅰ Introductionmentioning

confidence: 99%

Peroxide Modification of Nylon 12 Elastomer

Choi¹,

Jung²,

Chang³

2013

Elastomers and Composites

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ABSTRACT：Nylon 12 elastomer was slightly crosslinked in molten state by the addition of small amount of dicumyl peroxide (DCP) as a crosslink agent and triallycyanuate (TAC) as a co-agent during melt compounding at 160 o C in an internal mixer. The effect of the peroxide crosslinking on mechanical, dynamic mechanical and rheological properties of the nylon 12 elastomer was investigated by means of tensile testing, dynamic mechanical analysis (DMA) and small amplitude oscillating rheometer, respectively. With modification, there is an improvement in tensile modulus and Young's modulus with decease in elongation at break. DMA results for peroxide modified nylon 12 elastomers demonstrated that the glass transiaiton temperature of PTMG segment shifted to higher temperature and the storage modulus remained constant above the melting temperature of nylon 12 segments. Melt rheological studies revealed that the peroxide modified nylon 12 elastomer exhibited a more solid like behavior and stronger shear thinning behavior compared to neat nylon 12 elastomer, which was more prominent at higher TAC content in the polymer matrix. The peroxide modified nylon 12 elastomer exhibited good elastic recoverability and improved mechanical properties without sacrificing melt processibilty, and especially the service temperature range increased as compared to neat nylon 12 elastomer.

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“…Several works [10][11][12][13][14][15][16][17][18] studied peroxide induced crosslinking of EVA. The effects of crosslinking on the thermal and rheological properties of the EVA were studied.…”

Section: Introductionmentioning

confidence: 99%

“…Mishra et al [11] studied dynamic crosslinking of EVA/elastomer blends with DCP using a torque rheometer to determine their cure rates and activetion energies. Sung et al [12] have investigated the effects of crystallinity and crosslinking on the thermal and rheological properties of EVA/DCP compounds using a dynamic mechanical thermal analyzer (DMTA). They found that crosslinking affected the complex viscosities and loss moduli of the compounds.…”

Section: Introductionmentioning

confidence: 99%

Effects of Organic Peroxides on the Curing Behavior of EVA Encapsulant Resin

Thaworn¹,

Buahom²,

Areerat³

2012

OJPChem

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Compounds of poly(ethylene-co-vinyl acetate) (EVA with vinyl acetate content 33%) with three different organic peroxides, namely, dialkyl peroxide, peroxyester peroxide, and peroxyketal peroxide, were prepared with a twin screws extruder and a two-roll mixing mill. The cure behavior of the EVA compounds was analyzed from rheographs, which were obtained by a moving die rheometer (MDR) at various curing temperatures between 150˚C to 170˚C. The effects of organic peroxides on cure behavior were examined. The dynamic curing obtained by the torque rheometer provided sufficient experimental data to show that dialkyl peroxide is not suitable because it has a high half-life temperature and its by-products can discolor the final product. Peroxyester peroxide is good for curing at temperatures in the range of 150˚C to 160˚C, which accomplished an ultimate cure within 5 to 8 minutes. Also, the peroxyketal peroxide has higher performance, which decreased the optimum cure time to 3 minutes. The thermal decomposition mechanism of organic peroxide was applied to explain how the cure behavior is affected by generated free radicals.

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Effects of crystallinity and crosslinking on the thermal and rheological properties of ethylene vinyl acetate copolymer

Cited by 97 publications

References 19 publications

Effect of irradiation on mechanical and structural properties of ethylene vinyl acetate copolymers hollow fibers

Effect of irradiation on mechanical and structural properties of ethylene vinyl acetate copolymers hollow fibers

Peroxide Modification of Nylon 12 Elastomer

Effects of Organic Peroxides on the Curing Behavior of EVA Encapsulant Resin

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