Vinyl Cis Rubber superior polymer for future trends

摘要

Vinyl Cis Rubber(VCR)is cis-l,4-polybutadiene reinforced by highly crystalline fibrous syndiotactic-l,2-polybutadiene(SPB).It has been developed and commercialized by Ube Industries Co.,Ltd.The highly crystalline syndiotactic-l,2-polybutadiene having melting point(M.p.)up to 473K is obtained by using cobalt catalyst system.Fibrous crystalline domains in VCR are effective for the stress-induced crystallization of the rubber matrix.VCR has various improved properties such as high green strength,good processing,large modulus,good flex-crack resistance,etc.The improvement of physical and dynamic mechanical properties depends on the content of syndiotactic-l,2-polybutadiene dispersion in cis-l,4-polybutadiene matrix and rubber compound recipe.For examples;with the same compound recipe,VCR vulcanized significantly improve in modulus up to 80%,increase hardness up to 10%,and improve in flex-crack resistance.With the same hardness of vulcanized recipe,filler can be reduced down to 10-20 part per hundred rubbers consequently energy loss performance can be improved up to 10-18%.This polymer is widely used in eco-friendly tires,high performance tires,out sole of shoe,conveyor belts and other rubber goods.