Title :
Interfacial charge in polyethylene/ethylene vinylacetate laminates
Author :
Suh, Kwang S. ; Kim, Jae Y. ; Noh, Hong S. ; Lee, Chang R.
Author_Institution :
Dept. of Mater. Sci., Korea Univ., Seoul, South Korea
fDate :
12/1/1996 12:00:00 AM
Abstract :
Space charge formation in polyethylene (PE)/ethylene vinylacetate copolymer (EVA) laminates has been investigated using a pulsed electroacoustic method. The PE shows heterocharge while the EVA shows a broad distribution of positive charge over the sample. The positive charge in EVA decreases with the increase of vinylacetate (VA) content in EVA. Interfacial charge is found in all laminates and remains unchanged by heat treatment at 100°C to 1 h and by coating chemicals such as silicone oil and trimethylolpropane trimethacrylate at the interfaces, This interfacial charge distorts the electric field distribution in the direction of increasing the electric field in the PE layers. The charge distribution in PE/EVA blends has been measured and is explained via the results obtained with the laminates
Keywords :
dielectric measurement; electric fields; heat treatment; insulation testing; laminates; polyethylene insulation; polymer blends; space charge; 0 to 1 h; 100 degC; charge distribution; coating chemicals; copolymer; electric field distribution; heat treatment; heterocharge; interfacial charge; polyethylene/ethylene vinylacetate laminates; positive charge; pulsed electroacoustic method; space charge formation; Chemicals; Coatings; Distortion measurement; Heat treatment; Laminates; Petroleum; Polyethylene; Pulsed electroacoustic methods; Resistance heating; Space charge;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
