Vinyl polymerization. 364. Polymerization of methyl methacrylate initiated with benzaldehyde

Imoto, Minoru; Maeda, Takamasa; Ouchi, Tatsuro

doi:10.1002/pol.1979.170170208

Cited by 16 publications

(4 citation statements)

References 6 publications

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“…radical reactions (6) as well as results obtained, it is probable that, at least for MMA, the mechanism of radical initiation of polymerization with cyclohexanone resembles the mechanism proposed for aldehyde (3,4):…”

Section: Resultsmentioning

confidence: 86%

Polymerization of vinyl monomers initiated with cyclohexanone

Kaim¹

1984

J. Polym. Sci. B Polym. Lett. Ed.

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Section: Resultsmentioning

confidence: 86%

Polymerization of vinyl monomers initiated with cyclohexanone

Kaim¹

1984

J. Polym. Sci. B Polym. Lett. Ed.

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“…Generally, C M or C S , chain transfer constant, is in the range of 0.2-0.6 9 10 -6 [19][20][21]. The transfer reaction could be ignored in the polymerization of MMA.…”

Section: Nanocomposites Characterizationmentioning

confidence: 98%

Thermo-oxidative stability of poly(methyl methacrylate)/poly(methyl methacrylate)-grafted SiO2 nanocomposites

et al. 2013

Polym. Bull.

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Thermo-oxidative stability of PMMA-grafted SiO 2 and PMMA/PMMAgrafted SiO 2 nanocomposites was investigated by conventional non-isothermal gravimetric technique. It was interesting to find that PMMA-grafted SiO 2 nanoparticles exhibited higher thermo-oxidative stability than that of PMMA. The apparent activation energy of PMMA-grafted SiO 2 nanoparticles increased with the grafting ratio of PMMA from SiO 2 , which was estimated by Kissinger method. This indicates that the strong interactions existing between the grafted chains are responsible for the enhanced thermo-oxidative stability of PMMA-grafted SiO 2 nanoparticles. However, the grafting ratio of PMMA from SiO 2 in nanoparticles has only limited effect on the thermo-oxidative stability of PMMA/PMMA-grafted SiO 2 nanocomposites due to a much lower content of grafted PMMA in the nanoparticles relative to PMMA. The increased thermo-oxidative stability of PMMA/PMMAgrafted SiO 2 nanocomposites is possibly resulted from the increased SiO 2 content in the nanocomposites, in which the grafting ratio of PMMA in PMMA-grafted SiO 2 nanoparticles is kept almost as a constant. The glass transition temperature (T g ) of PMMA/PMMA-grafted SiO 2 nanocomposites is about 25°C and is higher than that of PMMA. The grafting ratio of PMMA from SiO 2 in the nanoparticles has no qualitative effects on the T g of the nanocomposites.

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“…In these polymerization systems, the interaction between the carbonyl oxygen in the additive carbonyl compound and the amide group in the AAm monomer seems to play an important role in the initiation and propagation steps. It has been reported that some types of active methylene containing compounds such as aldehyde and ketones induced the radical polymerization of polar vinyl monomers (9)(10)(11). For instance, the polymerization of methyl methacrylate (MMA) was induced by cyclohexanone, and its mechanism was proposed to involve the hydrogen radical transfer from ketone to MMA (12,13).…”

Section: Introductionmentioning

confidence: 99%

Polymerization of Acrylamide in Aqueous Solution of Poly(N‐isopropylacrylamide) at Lower Critical Solution Temperature

Ishifune

Suzuki

Yamane

et al. 2008

Journal of Macromolecular Science, Part A

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Acrylamide (AAm) was found to polymerize in a solution of poly(N-isopropylacrylamide) (PNIPAAm) in water at around its lower critical solution temperature (LCST) (328C) without any initiators. This phenomenon was specifically observed in aqueous solutions of the polymers having LCST such as PNIPAAm and poly(methylvinylether) (PMVE). AAm polymerized only when PNIPAAm and AAm were dissolved in water below LCST of PNIPAAm and then the solution was warmed up to the polymerization temperature (408C). On the other hand, the polymerization of AAm did not proceed when AAm was added into aqueous PNIPAAm solution during and after the phase separation above 328C. Furthermore the polymerizability of AAm was remarkably affected by the concentration and molecular weight of the PNIPAAm additives. Under the condition of lower PNIPAAm concentration (0.30 mol/L), the increase in the molecular weight of PNIPAAm considerably increased the molecular weight of the resulting PAAm but decreased the yield of PAAm. Under the condition of higher PNIPAAm concentration (0.60 mol/L) the polymerizability was not so affected by the molecular weight of PNIPAAm, while the molecular weight of PAAm formed by using higher molecular weight PNIPAAm was higher than those of PAAm formed by using lower molecular weight PNIPAAm. Moreover, the molecular weight of PAAm formed by the PNIPAAm induced polymerization of AAm was much higher than that of the polymer obtained by the radical polymerization using AIBN in THF or VA-061 in water.

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Vinyl polymerization. 364. Polymerization of methyl methacrylate initiated with benzaldehyde

Cited by 16 publications

References 6 publications

Polymerization of vinyl monomers initiated with cyclohexanone

Polymerization of vinyl monomers initiated with cyclohexanone

Thermo-oxidative stability of poly(methyl methacrylate)/poly(methyl methacrylate)-grafted SiO2 nanocomposites

Polymerization of Acrylamide in Aqueous Solution of Poly(N‐isopropylacrylamide) at Lower Critical Solution Temperature

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