By Topic

Influence of oxygen impurity in fluorinating mixtures on charge blocking properties of fluorinated surface layer of polyethylene

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

5 Author(s)
Zhenlian An ; Dept. of Electr. Eng., Tongji Univ., Shanghai, China ; Chenxia Liu ; Xuan Chen ; Feihu Zheng
more authors

Polyethylene samples were surface fluorinated by two kinds of F2/N2 mixture, containing 0.04% and 0.2% oxygen by volume, respectively. Infrared analyses do not clearly indicate the presence of oxygen in the surface layer fluorinated by the former, but clearly show that oxygen has been incorporated into the surface layers fluorinated by the latter. Moreover, the amount of fluorine introduced in the fluorinated layer is found to increase with the fluorine partial pressure or fluorination time. Thicknesses of the fluorinated layers are determined by SEM cross section images. Space charge measurements show that the thin fluorinated layer (0.24 μm) without appreciable oxygen can block the charge injection from electrodes very effectively, while the thick fluorinated layer (0.39 μm) with oxygen does not show the effectiveness. In this case, a further thick fluorinated layer is needed to achieve the blocking effect. The permittivity of the fluorinated layers is evaluated by the polar component of surface energy, and the results suggest an increase of the permittivity because of the incorporation of polar groups. Thermally stimulated discharge current measurements reveal different charge trapping properties between the fluorinated layers and a negative influence of oxygen on the decrease in free volume of the surface layer. The decrease in free volume is more important in suppressing the charge injection than the increase in surface layer permittivity and the change in surface trap.

Published in:

Dielectrics and Electrical Insulation, IEEE Transactions on  (Volume:20 ,  Issue: 1 )