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- W2171077682 abstract "The effect of the compatibility between a dispersed phase and a matrix polymer and the annealing on improvement in the toughness of injection-molded isotactic polypropylene (i-PP) blended with elastomers was studied. Two grades of ethylene-propylene copolymer (EPR(A) and EPR(B)) and styrene-ethylene-butadiene-styrene tri-block copolymer (SEBS) were used as elastomer. EPR(B), which has lower strength than EPR(A), was able to improve the toughness of i-PP more effectively than EPR(A). However, SEBS, which has higher strength than EPR(B), was more effective than EPR(B). This result contradicts the toughening mechanism of relaxing the strain constraint due to void formation. Two reasons are probable. First, the volume fraction of the dispersed phase of the i-PP blended with EPR(B), hereinafter referred to as EPR(B)/i-PP, is much lower than that of the i-PP blended with SEBS (SEBS/i-PP) because of the high compatibility between EPR and i-PP. Second, it is possible that the dissolved i-PP in EPR increases the strength of the dispersed phase. In this case, the void formation from the dispersed phase is restricted. Therefore, the efficiency of toughness improvement by relaxing the strain constraint is decreased. The annealing improves the phase separation. As a result, the strength of the dispersed phase is decreased, and therefore the toughness is improved. The effect of the annealing of EPR(B)/i-PP is higher than that of SEBS/i-PP because of the high compatibility between EPR and i-PP. POLYM. ENG. SCI., 46:29–38, 2006. © 2005 Society of Plastics Engineers" @default.
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- W2171077682 date "2005-01-01" @default.
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- W2171077682 title "Effect of the compatibility on toughness of injection-molded polypropylene blended with EPR and SEBS" @default.
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- W2171077682 doi "https://doi.org/10.1002/pen.20425" @default.
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