Abstract: Polystyrene(PS) was modified with 4-(chloromethyl) benzoic acid(CMBA) via Friedel-Crafts alkylation reaction,where benzoic acid(BA) ligand was bonded on the side chains of PS,yielding the functional macromolecule BAPS.The chemical structure of BAPS was characterized by FTIR,¹H NMR and UV absorption spectra.The coordination reaction between BAPS and Eu³⁺ ion as well as the coordination reaction between BAPS and Tb³⁺ ion were carried out,resulting in the polymer/rare-earth complexes,BAPS-Tb(Ⅲ).The florescence emission of BAPS-Tb(Ⅲ) was preliminarily examined.In this work,the effects of the main factors on the Friedel-Crafts alkylation action between CMBA and PS were examined,the reaction mechanism was investigated,and the reaction conditions were optimized.The experimental results show that the Friedel-Crafts alkylation reaction between CMBA and PS can proceed successfully,and the suitable reaction conditions are as follows:a temperature of 70℃,with N,N-dimethylacetylamide(DMAC) as solvent,and SnCl₄ as Lewis catalyst.The polymer/rare-earth complex BAPS-Tb(Ⅲ),possesses the fluorescence-emission spectrum of Tb³⁺ ion.More significantly,the macromolecular ligand BAPS can strongly sensitize the fluorescence-emission of Tb³⁺ ion.