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In this work,the amination of sulfonated polystyrene resin with alkyl secondary amine is investigated.The catalytic activities of the modified resins are determined through the hydration of 1-butene.The optimum chain length and the best range of amination rate are determined.It is found that the single-pass conversion of 1-butene was raised 2% on average,and the relative activity was increased over 30% after modification.A hypothesis about the enhancement of catalytic activities by the inclusion of alkyl chain to wrap up the butene molecule is proposed.