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Homopolymerization of methyl methacrylate and styrene: Determination of the chain-transfer constant from the Mayo equation and the number distribution for n-dodecanethiol

✍ Scribed by José Luis De La Fuente; Enrique López Madruga

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 202 KB
Volume: 38
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(20000101)38:1<170::aid-pola22>3.0.co;2-1

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✦ Synopsis

Chain-transfer constants were evaluated for n-dodecanethiol in the homopolymerization of styrene (S) and methyl methacrylate (MMA). The polymerizations were carried out in benzene at 50 °C with different amounts of 2,2Ј-azobisisobutyronitrile as the initiator. The new chain length distribution (CLD) analytical method was used and compared to the traditional Mayo method. The chain-transfer-constant values were independent of the initiator concentration and slightly higher (by a factor of 1.1 for MMA and 1.2 for S) when obtained according to the CLD method compared to the Mayo method. The chain-transfer constant for S was 20 times higher than for MMA.

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