Foaming Characteristics of Ethylene Vinyl Acetate/Styrene Vinyl Isoprene Styrene Triblock Copolymer Blend

Ethylene Vinyl Acetate / Styrene Vinyl Isoprene Styrene Triblock Copolymer 블렌드의 발포특성

  • Heo, Jae-Young (Department of Chemical Engineering, Pusan National University) ;
  • Kim, Jin-Tae (Department of Chemical Engineering, Pusan National University) ;
  • Yoon, Jung-Sik (Korea Institute of Footwear and Leather Technology) ;
  • Yoo, Jong-Sun (Korea Institute of Footwear and Leather Technology) ;
  • Kim, Won-Ho (Department of Chemical Engineering, Pusan National University)
  • 허재영 (부산대학교 공과대학 화학공학과) ;
  • 김진태 (부산대학교 공과대학 화학공학과) ;
  • 윤정식 (한국신발피혁연구소) ;
  • 유종선 (한국신발피혁연구소) ;
  • 김원호 (부산대학교 공과대학 화학공학과)
  • Published : 2000.06.30

Abstract

The foam of ethylene vinyl acetate (EVA)/styrene-vinyl isoprene-styrene triblock copolymer(SVIS) blend was prepared to improve the shock-absorption and compression set characteristics at room temperature. The effects of blowing agent and blend ratio of EVA/SVIS on expansion ratio, cell structure and mechanical properties of the foam were investigated. As the SVIS content increased, the viscosity of blends was increased but the crosslinking rate was slow down, the expansion ratio was decreased. and the specific gravity was increased. At room temperature, the resilience was not affected by increasing the amount of blowing agent. The value of tan ${\delta}$ was increased by increasing the amount of SVIS. As a result, the value of compression set was decreased. This is due to the increased values of specific gravity and crosslinking density of the EVA/SVIS foam.