Radical polymerization of styrene in the presence of C60

✍ Scribed by Yun Chen; Kou-Cheng Lin

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 148 KB
• Volume: 37
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19990801)37:15<2969::aid-pola30>3.0.co;2-g

✦ Synopsis

Radical polymerizations of styrene in the presence of C 60 have been conducted at 90°C in benzene using benzoyl peroxide (BPO) as initiator. The behaviors of C 60 are investigated by monitoring BPO concentration, C 60 content, and polymerization time. It is found that C 60 acts like a radical absorber which multiply absorbs primary radicals from BPO and propagating radicals. Therefore, in the presence of C the yield and molecular weight decrease significantly. However, the molecular weight distribution is narrowed down by its coupling characteristics. At the beginning of the reaction, owing to the radical-absorbing effect of C 60 , it makes the chain-propagation restricted. However, the number of polystyrene chains added to C 60 increases with polymerization time. Direct dilatometric experiment proves that C 60 is mainly as inhibitor for radical polymerization of styrene by benzoyl peroxide. Besides, the glass transition temperature (T g ) of the copolymers increases with increasing content of C 60 .