SYNDIOTACTIC 1,2-POLYBUTADIENE WITH CO-CS2 CATALYST SYSTEM .1. PREPARATION, PROPERTIES, AND APPLICATION OF HIGHLY CRYSTALLINE SYNDIOTACTIC 1,2-POLYBUTADIENE

In the reported experiments, highly crystalline syndiotactic 1,2-polybutadiene (s-PB) having melting point (mp) up to 216 degree C was obtained by using a Co(acac)//3-AlEt//3-CS//2 catalyst. The polymer with mp 208 degree C was found to have 99. 7% l,2 content and 99. 6% syndiotacticity by **1H and **1**3C-NMR measurements. The s-PB can be molded by addition of a stabilizer such as 2,6-di-t-butyl-4-hydroxymethylphenol into fiber, film, and various shaped articles. The physical properties presented in the present article include stress-strain and dynamic mechanical behavior. The highly crystalline syndiotactic 1,2 polybutadiene was applied to a carbon fiber and UBEPOL VCR (cis-1,4-polybutadiene reinforces by fibrous syndiotactic 1,2-polybutadiene).