Solvent effects on the free-radical copolymerization of styrene with butyl acrylate. I. Monomer reactivity ratios

Fernández-Sanz, Marina; Madruga, Enrique López; Cuervo-Rodríguez, Rocío; Hernández-Gordo, Vicente; Fernández‐Monreal, M. C.

doi:10.1002/(sici)1099-0518(20000101)38:1<60::aid-pola8>3.0.co;2-f

Cited by 25 publications

(15 citation statements)

References 33 publications

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“…The apparent reactivity ratios obtained with PA as cosurfactant in the reaction medium are differing from the values obtained with OA as cosurfactant under present study. The reactivity ratio of STY decreases whereas the reactivity ratio of the n ‐butyl acrylate increases while the polarity of the solvent in the reaction medium increases 44. A similar behavior was observed in STY/MMA copolymerization system when the copolymerization was performed in benzene, chlorobenzene, and benzonitrile; that is, the apparent reactivity ratio of STY diminished and the MMA reactivity ratio increased with the increase of solvent polarity 45.…”

Section: Resultssupporting

confidence: 57%

Microemulsion and conventional emulsion copolymerizations of styrene with methyl methacrylate

Reddy

Devi²,

Panda³

2007

J of Applied Polymer Sci

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The microemulsion (M.E.) and conventional emulsion (C.E.) copolymerizations of styrene (STY) with methyl methacrylate (MMA) are carried out at 708C by employing n-pentanol (PA) and n-octanol (OA), respectively, as cosurfactants along with sodium lauryl sulfate (SLS), as surfactant in the reaction media, and potassium persulphate (KPS) as initiator. The copolymers are characterized by FTIR, NMR, TG/DTA, and GPC techniques. The reactivity ratios are evaluated by employing Fineman-Ross (F-R), Kellen-Tü dös (K-T), and Mayo-Lewis integration (M-L-I) methods. The K-T method yields the apparent reactivity ratios, 0.73 (r STY ), 0.39 (r MMA ) and 0.55 (r STY ), 0.50 (r MMA ), respectively, for the M.E. and C.E. copolymerizations of STY and MMA with PA as the cosurfactant present in the reaction media. And the K-T method yields the apparent reactivity ratios, 0.56 (r STY ), 0.43 (r MMA ), and 0.42 (r STY ), 0.51 (r MMA ), respectively, for the M.E. and C.E. copolymerizations of STY and MMA with OA as the cosurfactant present in the reaction media.

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Section: Resultssupporting

confidence: 57%

Microemulsion and conventional emulsion copolymerizations of styrene with methyl methacrylate

Reddy

Devi²,

Panda³

2007

J of Applied Polymer Sci

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“…This should be attributed to the different monomer activities of St and nBA. Thanks to its strong conjugate structures, styrene monomer has much higher reactivity than nBA, as evidenced by their reactivity ratio ( r nBA = 0.189, r St = 0.865, bulk at 50 °C) . It is well accepted that the midchain radicals have a very low reactivity so that they are more difficult to initiate a chain growth in the polymerization of butyl acrylate in this case .…”

Section: Resultsmentioning

confidence: 93%

Suppressing the long‐chain branching in the synthesis of poly(styrene‐b‐butyl acrylate‐b‐styrene) in RAFT emulsion polymerization by tuning the interfacial properties

Guo

Gao

Luo

2015

J. Polym. Sci. Part A: Polym. Chem.

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Reversible addition‐fragmentation chain transfer (RAFT) emulsion polymerization is becoming an important technique to synthesize the latex of block copolymers. A previous study showed that in the synthesis of polystyrene‐b‐poly(butyl acrylate)‐b‐polystyrene triblock copolymer via RAFT emulsion polymerization using amphiphilic oligo(acrylic acid‐styrene) macroRAFT as surfactant and mediator, the molecular weight distribution could be much broadened to PDI higher than 2. In this study, an in‐depth investigation was performed to decrease PDI. It was found that long‐chain branches could be formed in the synthesis of triblock block copolymer, leading to the appearance of a higher molecular weight shoulder in the GPC curve of the final product. The lower neutralization degree of acrylic acid (AA) units on the macroRAFT and shorter AA chains would help to suppress the formation the long‐chain branches, leading to PDI around 1.5. It is evidenced that the successful suppression is due to the promotion of radical entry as a result of decreased interfacial transport impedance. It is also evidenced that the presence of styrene during the polymerization of butyl acrylate could promote the formation of long chain branches. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 1464–1473

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“…Furthermore, there is experimental evidence24–28 that the bootstrap model, proposed by Harwood,6 is the most appealing as a general model. Harwood observed that copolymers with the same compositions have the same microstructure, which is independent of the solvent used during their preparation.…”

Section: Resultsmentioning

confidence: 99%

Solvent effect on the free‐radical copolymerization of 2‐hydroxyethyl methacrylate with t‐butyl acrylate

Fernández-Monreal¹,

Martínez²,

Sánchez‐Chaves³

et al. 2001

J. Polym. Sci. A Polym. Chem.

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The free‐radical copolymerization of 2‐hydroxyethyl methacrylate with t‐butyl acrylate was carried out at 50 °C in bulk and in 3 mol · L−1 1,4‐dioxane and N,N′‐dimethylformamide solutions. Differences between the apparent reactivity ratios determined in this work indicated a noticeable solvent effect. This is explained with a qualitative bootstrap effect. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 2043–2048, 2001

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Solvent effects on the free-radical copolymerization of styrene with butyl acrylate. I. Monomer reactivity ratios

Cited by 25 publications

References 33 publications

Microemulsion and conventional emulsion copolymerizations of styrene with methyl methacrylate

Microemulsion and conventional emulsion copolymerizations of styrene with methyl methacrylate

Suppressing the long‐chain branching in the synthesis of poly(styrene‐b‐butyl acrylate‐b‐styrene) in RAFT emulsion polymerization by tuning the interfacial properties

Solvent effect on the free‐radical copolymerization of 2‐hydroxyethyl methacrylate with t‐butyl acrylate

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