Radical copolymers of 2-vinyl pyridine with methyl acrylate and methacrylate. A study of microstructures by 1H n.m.r.

Natansohn, Almeria; Maxim, Steliana; Feldman, D.

doi:10.1016/0032-3861(79)90179-4

Cited by 23 publications

(8 citation statements)

References 9 publications

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“…(Received November 10,1980) this copolymerization could be correctly approximated by the simple terminal mechanism, because the Kelen-Tudos plots were in all cases straight lines (2). Therefore, although the intermonomeric complexation was evidenced (the value of equilibrium constant K = 0.22 l/tool (1)) this complex does not affect the copolymerization mechanism (3).…”

Section: M273mentioning

confidence: 90%

Configuration of methyl methacrylate-2-naphthyl methacrylate copolymers

Simionescu¹,

Natansohn²,

Percéc³

1981

Colloid Polymer Sci

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Radical copolymerization of methyl methacrylate (MMA, M1) with 2-naphthyl methacrylate (2NM, 3t/2) is characterized by the reactivity ratios: r 1 = 0.33 4-0.08 r 2 = 1.93 4-0.16.Analysing the a-CH 3 signal in the 1H-NMR spectra, the coisotacfic alternating addition probability is found to be = 0.25. ZusammenfassungDie radikalische Kopolymerization des Methylmethacrylats (MMA, 3/1) mit 2-Naphthylmethacrylaten (2NM, Mz) kennzeichnet sich durch die folgenden Reaktivit~itsverh~lt-nisse: rl = 0.33 + 0.08 r 2 = 1.93 +!0.16. Die Analyse des a-CH 3 signals in 1H-NMR Spektren ergab eine koisotaktische atternierende Additionsprobabilit~it yon cr = 0.25.

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Section: M273mentioning

confidence: 90%

Configuration of methyl methacrylate-2-naphthyl methacrylate copolymers

Simionescu¹,

Natansohn²,

Percéc³

1981

Colloid Polymer Sci

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“…Similar behavior was observed by Natanshon et al with copolymers of methyl acrylate (MA) or MMA with 2VP or 4VP. [34][35][36] Simultaneously, The signals belonging to aromatic, methoxy, and a-CH 3 groups are split with an increase in 4VP content in copolymers due to their compositional (monomer sequence distribution) as well as configurational sensitivity. In agreement with Natanshon et al studies, these signals are tentatively assigned in terms of triads and are depicted in Figure 4, where M and V indicate MMA and 4VP, respectively.…”

Section: Copolymer Stereochemistrymentioning

confidence: 97%

“…38 In the copolymers spectra, the M r M r M triad signal undergo splitting to three other signals at about 0.72, 0.63, and 0.5 ppm, whose intensities increase with increasing 4VP units assigned respectively to (M m M m V 1 M r M r V), (M r M m V 1 V r M r V) and V m M r V triads, as proposed by Natanshon. 34 Scheme 3 represents the monomer sequence distribution in terms of (M) centered triads and the relative stereochemical configuration.…”

Section: A-ch 3 Signalmentioning

confidence: 99%

Copolymerization of methyl methacrylate with 4‐vinylpyridine initiated by a novel Ni(II)α‐Benzoinoxime complex

Harrar-Ferfera

2007

J of Applied Polymer Sci

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Copolymerizations of methyl methacrylate (MMA) with 4-vinylpyridine (4VP) were performed from different monomer feed ratios in 1,4-dioxan at 308C under free radical initiation experimental conditions, using Ni(II)a-Benzoinoxime complex as initiator. The obtained copolymers (PMMA4VP) were examined by FTIR and 1 H NMR spectroscopies. The composition of these copolymers was calculated, using 1 H NMR spectra and elemental analysis. Monomer reactivity ratios were estimated from Fineman-Ross (FR, r m 5 0.550, r v 5 1.165) and Kelen-Tudos (KT, r m 5 0.559, r v 5 1.286) linearization methods, as well as nonlinear error in variables model (EVM) method using the RREVM computer program (RREVM, r m 5 0.559, r v 5 1.264). These values suggest that MMA-4VP pair copolymerizes randomly. 1 H NMR spectra provide information about the stereochemistry of the copolymers in terms of sequence distributions and configurations. These results showed that the age of the Ni complex has an impact not only on its activity towards polymerization reactions but also on the features of the corresponding copolymers, whereas the chemical composition was insensitive to this prominent factor. The mechanism of MMA-4VP copolymerization is consistent with a radical process as supported by microstructure and molecular weight distribution studies. Thermal behaviours of these copolymers were investigated by differential scanning calorimetry and thermogravimetric analysis.

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“…Thus, it can be used to differentiate between block and random copolymers and measure the tacticity of polymer chains. As examples of application, NMR characterizes polymers as to stereoregularity (163,164), monomer sequences (165-167), and microstructure (168)(169)(170) and is used to analyze monomers (171)(172)(173)(174) and elucidate polymerization mechanisms (175)(176)(177)(178). Of considerable interest is the use of pulsed NMR to measure cure in UV-irradiated coat ings (179).…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

Spectroscopic Methods in Research and Analysis of Coatings and Plastics

Craver¹

1985

ACS Symposium Series

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Radical copolymers of 2-vinyl pyridine with methyl acrylate and methacrylate. A study of microstructures by 1H n.m.r.

Cited by 23 publications

References 9 publications

Configuration of methyl methacrylate-2-naphthyl methacrylate copolymers

Configuration of methyl methacrylate-2-naphthyl methacrylate copolymers

Copolymerization of methyl methacrylate with 4‐vinylpyridine initiated by a novel Ni(II)α‐Benzoinoxime complex

Spectroscopic Methods in Research and Analysis of Coatings and Plastics

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