Effect of three reactive polymer plasticizers,such as hydroxy silicone oil,hydroxy fluorosilicone oil and vinyl fluorosilicone oil,on the processing and properties of fluororubbe(FKM)composites was investigated.The addition of the three polymer plasticizers shortened the positive vulcanization time(t90)and decreased the ML and MH-ML values of the FKM composites.Influenced by fluorine atoms,fluorosilicone oil plasticizers modified FKM composites exhibited the better mechanical properties,aging resistance,thermal stability,and low-temperature performance.The vinyl fluorosilicone oil as a reactive plasticizer for double bond sealing had the best modification effect on FKM.After thermo-oxidative aging at 180 ℃ for 192 h,the vinyl fluorosilicone oil plasticized FKM composite exhibited better mechanical properties and retention of elongation at break.The glass transition temperature of the fluororubbe composite plasticized by the vinyl fluorosilicone oil shifted from-2.6 ℃ to-3.7 ℃,and the brittleness temperature shifted from-45 ℃ to-54 ℃.And the the vinyl fluorosilicone oil had partly solved the migration and precipitation phenomenon of small molecule plasticizers.
关键词
氟橡胶/聚合物增塑剂/力学性能/耐老化性能/低温性能
Key words
fluororubbe/polymer plasticizer/mechanical propertie/aging resistance performance/low temperature performance
维普
万方数据