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One important reason for why there are properties differences be-tween natural rubber(NR)and polyisoprene rubber by neodymium catalyst(Nd-IR)is that the former can crystallize under strain,but the latter can not．Recently polyisoprene(PI)with the character of crys-tallization under strain was prepared by the Nd(vers)3(simplied as Nd)/A1(i-Bu)3(simplied as A1)/AI(i-Bu)2C1(simplied as C1)homogeneous catalyst under appropriate conditions[1]．