Structural analysis of electron beam irradiated ethylene-vinyl acetate copolymer (EVA) film (II)

1992 ◽  
Vol 29 (2) ◽  
pp. 91-95 ◽  
Author(s):  
Toshiro Matsui ◽  
Mitsuya Shimoda ◽  
Yutaka Osajima
Keyword(s):  
Electron Beam ◽  
Structural Analysis ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

Effect of electron beam irradiation on the thermal and mechanical properties of ethylene-vinyl acetate copolymer/polyamide blends

2020 ◽  
pp. 096739112093010
Author(s):  
Jawad Ahmed ◽  
Yong Zhang
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Vinyl Acetate ◽  
Irradiation Dose ◽  
Ethylene Vinyl Acetate ◽  
Cross Linking ◽  
Thermal And Mechanical Properties ◽  
Beam Irradiation ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

The effect of electron beam (e-beam) irradiation on the thermal and mechanical properties of ethylene-vinyl acetate copolymer/ternary polyamide (EVA/tPA) blends was studied. The e-beam irradiation was carried out over a range of dose from 50 kGy to 500 kGy with trimethylolpropane trimethacrylate (TMPTMA) and triallyl isocyanurate (TAIC) as cross-linking coagents. With increasing irradiation dose, the gel fraction of the EVA/tPA blends increased significantly. After irradiated by e-beam at 500 kGy, the insoluble fraction of EVA/tPA blends with 3 parts per hundred rubber TMPTMA increased from 28% to 86%. The tensile strength of EVA/tPA/TMPTMA-3 (70/30/3) considerably increased up to 172% with a value of 10.01 MPa at 500 kGy due to an increase in cross-linking compared to the EVA/tPA/TAIC-3 (70/30/3) blend. However, the melting temperature and crystallization peak temperature of EVA/tPA blends decreased with increasing irradiation dose. Thermogravimetric analysis demonstrated that the irradiation cross-linking could improve the thermal stability of the EVA/tPA blends. The degradation kinetics of the EVA/tPA blends at elevated temperatures were studied using the Kissinger, Flynn–Wall–Ozawa, and Friedman methods. Irradiation cross-linked EVA/tPA blends exhibited a remarkable improvement in their oil resistance, with the identified improvement being most prominent in the EVA/tPA/TMPTMA-3 blend.

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