Irradiation of poly(vinyl ester)/clay nanocomposites

Abstract

The effect of electron beam irradiation on pristine poly(vinyl ester) and cured poly(vinyl ester)/clay nanocomposite with different clay contents is studied at irradiation doses ranging from 100 to 1000 kGy at room temperature. Poly(vinyl ester)/clay nanocomposites were prepared with different amounts of organically modified montmorillonite (1, 3, and 5 wt.%) by in situ polymerization method. Morphology properties of synthesized nanocomposites were studied by X-ray diffraction and transition electron microscopy. The irradiation dose up to 500 kGy yields an increase in Young’s modulus and tensile strength of nanocomposites while further irradiation deteriorates the mechanical strength of samples. Irradiation has no considerable influence on the surface hardness of synthesized nanocomposites. Thermogravimetric analysis results reveal the thermal stability of poly(vinyl ester), and its nanocomposites is improved with irradiation up to 500 kGy. However, similar to mechanical perdition at 1000 kGy irradiation, thermal resistance of nanocomposites decreases. The enhancement in mechanical and thermal properties of synthesized nanocomposites is attributed to the cross-linking effect as bonds can be formed directly between the neighbouring chains.

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

“…In recent years, electron beam (e-beam) irradiation processing has gained increased attention when compared with conventional chemical and heat treatment processes due to its potential to enhance the mechanical and thermal properties of polymer blends. [1][2][3][4] The e-beam process is a more environmentally friendly, cost-effective, and efficient process than chemical cross-linking. [5][6][7][8][9][10][11] E-beam irradiation generates free radicals, thereby producing a three-dimensional (3D) network structure, thus improving the mechanical properties, chemical and solvent resistance, and thermal and dimensional stability of polymer blends.…”