The influence of nanostructure formation on properties for Cr implanted PET
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The influence of nanostructure formation on properties for Cr implanted PET Wu Yuguang a, Zhang Tonghea, Zhang Huixinga, Zhang Xiaojia, Cui Pinga, Zhou Gub a
Key Laboratory in University for Radiation Beam Technology & Material modification, Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing Radiation Center, Beijing 100875 b Testing and analysis center, Beijing Normal University, Beijing 100875 ABSTRACT
Polyethylene terephthalate (PET) has been modified by Cr ion implantation with a dose range from 1x1016 to 2x1017ions /cm2 using a metal vapor vacuum arc MEVVA source. The surface morphology was observed by atomic force microscopy (AFM). The Cr atom precipitation was found. The changes of the structure and composition have been observed with transmission electron microscope (TEM). The TEM photos revealed the presence of Cr nano-meter particles on the implanted PET. It is believed that the change would cause the improvement of the conductive properties and wear resistance. The electrical properties of PET have been improved after metal ion implantation. The resistivity of Cr ion implanted PET decreased obviously with an increase of ion dose. When the metal ion dose with 2x1017cm-2 was implanted into PET, the resistivity of PET could be less than 0.1 Ωm. But when Si or C ions with same dose are implanted PET, the resistivity of PET would be up to several Ωm. The result show that the resistivity of Cr ion implanted sample is obviously lower than that of Si- and C-implanted one. After Cr implantation, the surface hardness and modulus could be increased. The property of the implanted PET has modified greatly. The hardness and modulus of Cr implanted PET with dose of 2x1017/cm2 is 9.5 and 3.1 times greater than that of pristine PET. So we can see that wear resistance improved greatly. The Cr ion beam modification mechanism of PET will be discussed. Introduction Polymeric solids have a great potential in many important applications because of their unique properties, such as a low density, ability to form intricate shapes, versatile electronic properties and low manufacturing cost. However the use of polymers is still limited, because of their inherent softness and unexpected dielectric properties. In order to enhance the electrical and mechanical properties of the polymers, ion implantation techniques have been performed [1-3]. Recent studies have shown that ion implantation is very effective for improving surface properties of polymers such as surface hardness and wear resistance [4-6]. Until now most nonmetal ions have been used in surface modification of polymers. However, only a few papers about metal ion implantation on polymers were published [7-9]. In this paper, the changes of morphology, structure and electrical and mechanical properties of PET in metal ions implanted layer are studied, the modification mechanism will be discussed. Experiments and methods
C8.25.1 1
Specimens of PET with thickness of 99µm were prepared. Implantation was performed with a metal vapor vacuum arc MEVVA im
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