EPDM/PP/Ionomer 삼원 블렌드로 된 열가소성 가황체의 파괴 인성
Fracture Toughness of the Thermoplastic Vulcanizates from EPDM/PP/Ionomer Ternary Blends
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The fracture mechanic investigation of the thermoplastic vulcanizates(TPV) from EPDM and PP/ionomer ternary blends was performed in terms of the J-integral by measuring fracture energy via the locus method. The TPV from ternary blends consisting of EPDM,PP and ionomer were prepared in a laboratory integral mixer by blending and vulcanizing simultaneously. Vulcanization was performed with dicumyl peroxide (DCP) and the composition of EPDM and PP were fixed at 50/50 by weight. Two kinds of poly(ethylene-co-methacrylic acid)(EMA) ionomers were used. The J-integral values at crack initiation, Jc, of the dynamically vulcanized EPDM and PP/EMA ionomer ternary blends were affected by the cation types (Na+ or Zn2+) and contents(5-20 wt%) of the added EMA inomers. The ternary blend containing 20wt % zinc-neutralized EMA ionomer and 1.0 phr DCP showed the highest Jc values of the blends.
Abstract
The fracture mechanic investigation of the thermoplastic vulcanizates(TPV) from EPDM and PP/ionomer ternary blends was performed in terms of the J-integral by measuring fracture energy via the locus method. The TPV from ternary blends consisting of EPDM,PP and ionomer were prepared in a laboratory integral mixer by blending and vulcanizing simultaneously. Vulcanization was performed with dicumyl peroxide (DCP) and the composition of EPDM and PP were fixed at 50/50 by weight. Two kinds of poly(ethylene-co-methacrylic acid)(EMA) ionomers were used. The J-integral values at crack initiation, Jc, of the dynamically vulcanized EPDM and PP/EMA ionomer ternary blends were affected by the cation types (Na+ or Zn2+) and contents(5-20 wt%) of the added EMA inomers. The ternary blend containing 20wt % zinc-neutralized EMA ionomer and 1.0 phr DCP showed the highest Jc values of the blends.
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