In order to study the relationship between the structure and properties of the copolymer thinners,SSMA and AMA thinners were synthesized using sodium p-styrene sulfonate,maleic anhydride and acrylic acid as raw materials,ammonium persulfate(APS) as initiator.The viscosity reduction performance,temperature resistance and salt tolerance of them were investigated.The results showed that SSMA and AMA,with sulfonic acid group and carboxyl group respectively,could efficiently break the links between clay particle...