Diffusion hành vi của các giải pháp môi trường ăn mòn trong cacbon đen đầy sửa đổi lót polyethylene. | VNU Journal of Science Mathematics - Physics 26 2010 71-81 Diffusion behaviour of corrosive solution environments in carbon black filled modified polyethylene linings Chau Van Dinh1 M. Kubouchi2 1Department of Physical Engineering and Nano Technology University of Technology and Engineering VNU 144 Xuan Thuy Cau Giay Hanoi Vietnam 2Department of Chemical Engineering Graduate School of Science and Engineering Tokyo Institute of Technology 2-12-1 Ookayama Meguro Tokyo. 152-8552 Japan Received 15 December 2009 Abstract. The diffusion behaviour of water and HCl solution at different temperatures and concentrations into a modified polyethylene filled with carbon black used for lining is presented. It has shown the predominant role of nature of environment and carbon black content. In the both environments an increase of environmental temperature increased the capacity of environmental absorption and the diffusion rate. The lower sorption capacity was observed at 40 and 60 oC while a higher at 80oC in the water. The two-stage diffusion appeared for the case of the corrosive environment at 80oC. An increase of carbon black loading was increased both diffusion rate and saturation values. Diffusion of the environment into the polymer proposed by the following environmental molecules diffusing into the polymer matrix through porous system were trapped by functional groups on the carbon black surface and polymer molecule chain and are immobilized. This explains the increase of sorption capacity when increase carbon black loading. Keywords modified polyethylene composites lining diffusion chemical degradation. 1. Introduction The service life of polymeric lining coating-iron steel system is limited by degradation and diffusion phenomenon. The polymeric lining coating layer is required to have high resistance against its working corrosive environment low environmental diffusion rate and high adhesion on substrate. Polyethylene PE is considered as a good material for lining .
