✍ Scribed by P. E. Cassidy; G. D. Schwank
No coin nor oath required. For personal study only.
Oehydrated castor oil (DCO) has been used as a comonomer with styrene to determine reactivity ratios. The polymerization was a free-radical process in benzene, and the product was isolated by evaporation of the reaction mixture and by two precipitations into petroleum ether from benzene. The copolymer composition was determined by a saponification procedure, DCO was found to have a high chain transfer constant and a very low reactivity ratio (estimated at 0.086) compared to styrene (11.6). It was found that copolymerization is difficult to achieve in a system where the DCO concentration in the reaction mixture was above 20 mole-%.
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## Abstract The free‐radical copolymerization of propyl, pentyl, hexyl, heptyl, octyl, and dodecyl methacrylates with triallyl cyanurate was investigated. The reactivity ratios were determined using the methods of Fineman‐Ross and Kelen‐Tüdös. The Alfrey‐Price __Q__ and __e__ values for the methacr