Surface Modification of Low Density Polyethylene and Adhesion Characteristics of Low Density Polyethylene/Aluminum Laminate

저밀도 폴리에틸렌의 표면개질과 이를 이용한 저밀도 폴리에틸렌/알루미늄 라미네이트의 접착특성

  • Jung, B.Y. (College of Environment and Applied Chemistry) ;
  • Ryu, S.H. (College of Environment and Applied Chemistry)
  • 정배영 (경희대학교 환경응용화학부) ;
  • 류승훈 (경희대학교 환경응용화학부)
  • Published : 2001.09.30

Abstract

Ultraviolet photografting of acrylic acid onto low density polyethylene was characterized using XPS and contact angle measurement. Effects of surface modification at LDPE and aluminum on LDPE/Al laminate were also investigated. Contact angle decreased significantly at initial state arid tends to level off with increasing UV irradiation time. The improvement of hydrophilicity was due to the presence of acrylic acid on LDPE surface. Graft of acrylic acid onto LDPE was also identified from O1s/C1s ratios in XPS spectrum. Adhesion strength of LDPE-g-AAc/Al laminate showed about 30 times higher than LDPE/A1 system and it could be attributed to the increase of polarity of LDPE surface. Chemical treatment of Al surface using sulfuric acid/sodium dichromate also increased the adhesion strength of LDPE/Al laminate. Adhesion strength of LDPE/Al laminate decreased significantly under acetic acid.