Copolymerization propagation kinetics of styrene with alkyl methacrylates
Copolymerizations have been carried out with styrene (STY) as monomer 1 and with ethyl (EMA), n-butyl (BMA), or lauryl (LMA) methacrylate as monomer 2. A pulsed UV laser was used to photoinitiate the polymerizations to low conversion. The resultant copolymers were analyzed for composition and molecu...
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| Veröffentlicht in: | Macromolecules 1990-04, Vol.23 (8), p.2113-2119 |
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| container_end_page | 2119 |
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| container_title | Macromolecules |
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| creator | Davis, Thomas P O'Driscoll, Kenneth F Piton, Mark C Winnik, Mitchell A |
| description | Copolymerizations have been carried out with styrene (STY) as monomer 1 and with ethyl (EMA), n-butyl (BMA), or lauryl (LMA) methacrylate as monomer 2. A pulsed UV laser was used to photoinitiate the polymerizations to low conversion. The resultant copolymers were analyzed for composition and molecular weight. Propagation rate constants were obtained as a function of composition for each of the copolymerizations, and reactivity ratios for the copolymerization of STY with EMA (r sub 1 = 0.62, r sub 2 = 0.35) and with BMA (r sub 1 = 0.72, r sub 2 = 0.45). None of the copolymerizations conformed to the Mayo--Lewis model with respect to their propagation rate constants. The results were interpreted using a penultimate model for propagation. Homopropagation rate constants for each of the monomers were also determined at several temperatures, allowing Arrhenius expressions to be formulated. Graphs. 30 ref.--AA |
| doi_str_mv | 10.1021/ma00210a003 |
| format | Article |
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A pulsed UV laser was used to photoinitiate the polymerizations to low conversion. The resultant copolymers were analyzed for composition and molecular weight. Propagation rate constants were obtained as a function of composition for each of the copolymerizations, and reactivity ratios for the copolymerization of STY with EMA (r sub 1 = 0.62, r sub 2 = 0.35) and with BMA (r sub 1 = 0.72, r sub 2 = 0.45). None of the copolymerizations conformed to the Mayo--Lewis model with respect to their propagation rate constants. The results were interpreted using a penultimate model for propagation. Homopropagation rate constants for each of the monomers were also determined at several temperatures, allowing Arrhenius expressions to be formulated. 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A pulsed UV laser was used to photoinitiate the polymerizations to low conversion. The resultant copolymers were analyzed for composition and molecular weight. Propagation rate constants were obtained as a function of composition for each of the copolymerizations, and reactivity ratios for the copolymerization of STY with EMA (r sub 1 = 0.62, r sub 2 = 0.35) and with BMA (r sub 1 = 0.72, r sub 2 = 0.45). None of the copolymerizations conformed to the Mayo--Lewis model with respect to their propagation rate constants. The results were interpreted using a penultimate model for propagation. Homopropagation rate constants for each of the monomers were also determined at several temperatures, allowing Arrhenius expressions to be formulated. 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| subjects | Applied sciences Exact sciences and technology Physicochemistry of polymers Polymerization Polymers and radiations |
| title | Copolymerization propagation kinetics of styrene with alkyl methacrylates |
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