Accelerated electron effects on EVA based compound

Budrugeac, P.; Zaharescu, Traian; Marcuta, M.; Marin, Gh.

doi:10.1002/app.21371

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…To improve its mechanical strength and thermal resistance properties, the crosslinking of EVA is a useful method 9. There are three methods for crosslinking of EVA at present: high‐energy irradiation ( 60 Co γ‐rays or electron beam) crosslinking,10, 11 chemical crosslinking (peroxide and silane crosslinking),12–14 and photoinitiated crosslinking 15.…”

Section: Introductionmentioning

confidence: 99%

Photocrosslinking of halogen‐free flame‐retarded ethylene‐vinyl acetate copolymer by phosphorous‐nitrogen compound NP28

Sun

2009

J of Applied Polymer Sci

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ABSTRACT:The photoinitiated crosslinking of halogenfree flame-retarded ethylene-vinyl acetate copolymer (EVA) by the phosphorous-nitrogen compound NP28 in the presence of photoinitiator and crosslinker and characterization of the related properties have been investigated by gel determination, heat extension test, thermogravimetric analysis (TGA), mechanical measurement, and thermal aging test. The photocrosslinking efficiency of EVA/NP28 blend and various factors affecting the crosslinking process, such as photoinitiator, crosslinker, NP28 content, and irradiation temperature, were studied in detail and optimized by comparison of gel content. The results show that the EVA/NP28 blend filled with 28.2 wt % NP28 with a thickness of 1.6 mm is homogeneously photocrosslinked to a gel content of above 80 wt % with 4.8 s UV-irradiation under optimum conditions. The data from TGA, mechanical measurement, and thermal aging test give evidence that the thermal stability and mechanical properties of photocrosslinked EVA/ NP28 blend are much better than those of the unphotocrosslinked one.

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Section: Introductionmentioning

confidence: 99%

Photocrosslinking of halogen‐free flame‐retarded ethylene‐vinyl acetate copolymer by phosphorous‐nitrogen compound NP28

Sun

2009

J of Applied Polymer Sci

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“…In addition, there are many articles on the production methods and the properties of crosslinked EVA and its blends. [8][9][10][11][12] However, the reports on e-beam crosslinked EVA foams are relatively rare.…”

Section: Introductionmentioning

confidence: 99%

Improvements of physical and mechanical properties of electron beam irradiation—crosslinked EVA foams

Rezaeian

Jafari

Zahedi

et al. 2008

Polymers for Advanced Techs

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In this work, ethylene–vinyl acetate (EVA) copolymer foams were prepared and crosslinked by using high‐energy electron beam (e‐beam) radiation (10 MeV). The effect of parameters such as irradiation dose, the contents of foaming agent, radiation activator, and radiation sensitizer on improvement of physical and mechanical properties of the EVA foamed samples were investigated. The foams were obtained through a four‐step process of melt mixing, forming, crosslinking, and foaming. During the melt mixing process EVA was compounded with different amounts of azodicarbonamide (ADCA) as a blowing agent, zinc oxide (ZnO) as a radiation activator, and trimethylol propane‐trimethacrylate (TMPTMA) as a radiation sensitizer. The samples were compression molded into flat sheets at low temperature (110°C) and were then radiation‐crosslinked by 20–80 kGy e‐beam. Finally, the crosslinked samples were converted to foams by a high temperature (210°C) compression molding process. The foamed samples were analyzed in terms of gel content, density, compression molding set, tensile properties, and micro‐structural features. It was found that an increase in absorbed radiation dosage increases crosslink density, elasticity, percentage recovery, tensile strength, and compression properties of the EVA foams. Due to the increased recovery the percentage of compression set was reduced. Similarly increasing the TMPTMA content in the formulation increased the crosslink density and the resulting mechanical properties. Contrary to these findings, addition of ADCA led to the formation of extra gases which in turn reduced the crosslink density, and resulted in the deterioration of the mechanical properties and hence an increase in the compression set. However, addition of ZnO and TMPTMA led to the formation of smaller and more uniform cell size with improved mechanical properties. Copyright © 2008 John Wiley & Sons, Ltd.

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Photoinitiated crosslinking of ethylene‐vinyl acetate copolymers and characterization of related properties

2007

Polymer Engineering & Sci

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Photoinitiated crosslinking of EVA in the presence of benzophenone (BP) as photoinitiator and triallyl isocyanurate (TAIC) as crosslinker and characterization of the related properties have been studied by gel determination, heat extension, DSC, DMTA, TGA, and mechanical measurements. The photoinitiated crosslinking efficiency of the EVA‐BP‐TAIC system and various factors affecting the crosslinking process, such as photoinitiator and crosslinker and their concentrations, irradiation temperature, and irradiation atmosphere were studied in detail and optimized by comparison of gel contents. The results show that the EVA samples with a thickness of 1 mm are readily crosslinked to a gel content of above 80% with 5 s UV‐irradiation under optimum conditions. The data from the heat extension and DSC show that the crosslinking density of photocrosslinked EVA increase and their crystallinities decrease with increasing the UV‐irradiation time. At the same time, photocrosslinking of EVA leads to a lowering of the melt temperature and a decrease of heat of fusion. The DMTA results show that photocrosslinking increases the amorphous phase and storage modulus of the crosslinked EVA, but does not change the glass transition temperature. The data from TGA and mechanical tests give evidence that the thermal stability and mechanical properties of photocrosslinked EVA samples are much better than those of the uncrosslinked EVA. POLYM. ENG. SCI., 47:1761–1767, 2007. © 2007 Society of Plastics Engineers

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Accelerated electron effects on EVA based compound

Cited by 3 publications

References 14 publications

Photocrosslinking of halogen‐free flame‐retarded ethylene‐vinyl acetate copolymer by phosphorous‐nitrogen compound NP28

Photocrosslinking of halogen‐free flame‐retarded ethylene‐vinyl acetate copolymer by phosphorous‐nitrogen compound NP28

Improvements of physical and mechanical properties of electron beam irradiation—crosslinked EVA foams

Photoinitiated crosslinking of ethylene‐vinyl acetate copolymers and characterization of related properties

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