Temperature dependence of the stereospecificity in the free radical polymerization of methyl methacrylate

Fox, Thomas; Goode, William E.; Gratch, Serge; Huggett, C. M.; Kincaid, John; Spell, Aldenlee; Stroupe, J. D.

doi:10.1002/pol.1958.1203112218

Cited by 128 publications

(8 citation statements)

References 5 publications

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“…5 (3) valid for PMMA in toluene a t 25 "C. The difference in the two KO values is far too great t o be explained b y the difference in solvent power or in temperature (as a matter of fact, we have measured the intrinsic viscosity for some of our fractions in benzene a t 30°C., and found the difference with [q] in toluene a t 25°C. 5 (3) valid for PMMA in toluene a t 25 "C. The difference in the two KO values is far too great t o be explained b y the difference in solvent power or in temperature (as a matter of fact, we have measured the intrinsic viscosity for some of our fractions in benzene a t 30°C., and found the difference with [q] in toluene a t 25°C.…”

Section: Discussionmentioning

confidence: 87%

Viscosity‐molecular weight relationships for low molecular weight polymers. II. Poly(vinyl acetate) and poly(methyl methacrylate)

Patrone

Bianchi

1966

Makromol. Chem.

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q]/Mn relationships a t 25°C. have been found for low molecular weight fractions of poly(viny1 acetate) (PVAc) in chlorobenzene and poly(methy1 methacrylate) (PMMA) in toluene.The PMMA used contains about 75% of syndiotactic form. Due to the difficulties of PMMA fractionation, the constants in the equation [q] = K Rg refer to an average degree of polydispersity equal to gw/an = 1.2.For both PVAc and PMMA there, is a range of molecular weight where a = 0.5; in these ranges [q] is practically indistinpishable from [ q ]~. ZUSAMMENFASSUNG: Die [q] /Bn-Beziehungen bei 25 "C fur Fraktionen niedrigeren Molekulargewichtes von Polyvinylacetat (PVAc) in Chlorbenzol und von Polymethylmetharrylat (PMMA) in Toluol wurden errnittelt. Das verwendete PMMA war zu etwa 75 yo syndiotaktisch. Wegen der Schwierigkeiten bei der Fraktionierung von PMMA beziehen sich die Konstanten in der Gleichung [q] = K @, auf einen mittleren Polydispersitatsgrad von xw/xn = 1,2. Fur beide Stoffe, sowohl PVAc a l s auch PMMA, gibt es einen Molekul.rrgewichtsbereich, in dem a = 0,5 ist; in diesem Bereich ist [q] praktisch von [ q ]~ nicht unterscheidbar. *) Part I cf..".

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Section: Discussionmentioning

confidence: 87%

Viscosity‐molecular weight relationships for low molecular weight polymers. II. Poly(vinyl acetate) and poly(methyl methacrylate)

Patrone

Bianchi

1966

Makromol. Chem.

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“…The infrared (IR) absorption of poly(methyl methacrylate) (PMMA) has been the subject of several investigations 1–5. The object of most of these investigations was to describe the dependence of the IR absorption characteristics in terms of the stereoregular nature of the polymer chain.…”

Section: Introductionmentioning

confidence: 99%

Infrared spectroscopic studies of poly(methyl methacrylate) doped with a new sulfur‐containing ligand and its cobalt(II) complex during γ‐radiolysis

Sayyah

El-Shafiey

Barsoum

et al. 2003

J of Applied Polymer Sci

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Infrared (IR) spectroscopy studies were performed for poly(methyl methacrylate) (PMMA) samples doped with an organic ligand or its cobalt(II) complex after the extraction of the dopant during ␥-radiolysis. There were no drastic changes in the IR absorption band position, but noticeable changes in the intensities were found. The relative transmission of IR absorption bands, such as those at 750, 840, 1065, and 1388 cm Ϫ1 , were measured according to the transmission of the carbonyl group band at 1717 cm Ϫ1. The degradation and recombination mechanism of different groups in the polymeric chain or backbone during radiolysis could be explained by the behavior of the relative transmission data for each group with increasing exposure dose. The tacticity of the PMMA samples was unchanged during radiolysis, and they were found to be syndiotactic. This was confirmed by the IR J values for different PMMA samples before and after irradiation. The protection efficiency of the organic ligand and its cobalt(II) complex was also investigated, and it was found that the organic ligand was more protective than the cobalt(II) complex for PMMA samples against ␥-rays.

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“…The infrared absorption characteristics of poly (methyl methacrylate) (PMMA) have been the subject of several investigations [1][2][3][4][5]. The object of most of these investigations was to describe the dependence of the IR absorption characteristics in terms of the stereoregular nature of the polymer chain.…”

Section: Introductionmentioning

confidence: 99%

Infrared Studies on Polymethyl Methacrylate Doped with a Sulphur-Containing Ligand and Its Cobalt (II) Complex During Gamma Radiolysis

Sayyah

Khaliel

El-Shafiey

et al. 2005

International Journal of Polymeric Materials

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Infrared spectroscopic studies were performed for poly(methyl methacrylate) samples doped with an organic ligand (N,N-dioxaloyl benzenesulphonyl-N,Ndioxaloylthiocarbazide) and its cobalt (II) complex during gamma radiolysis after extraction of the dopant. There are no drastic changes in the IR-absorption band positions, but noticeable changes in the intensities are found. The relative transmission of IR-absorption bands such as bands at 750, 840, 1065, and 1388 cm À1 were measured relative to the transmission of the carbonyl group band at 1717 cm À1 . The degradation and recombination mechanism of different groups in the polymeric chain or backbone during radiolysis are suggested by the behavior of the relative transmission data for each group with increasing exposure dose. The tacticity of the PMMA sample was unchanged during radiolysis and was found to be syndiotactic. This fact is confirmed by measuring the IR J-values for different PMMA samples before and after irradiation. The protection efficiency of the organic ligand and its cobalt (II) complex were also investigated and the organic ligand is a more protective material than the cobalt (II) complex

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Temperature dependence of the stereospecificity in the free radical polymerization of methyl methacrylate

Cited by 128 publications

References 5 publications

Viscosity‐molecular weight relationships for low molecular weight polymers. II. Poly(vinyl acetate) and poly(methyl methacrylate)

Viscosity‐molecular weight relationships for low molecular weight polymers. II. Poly(vinyl acetate) and poly(methyl methacrylate)

Infrared spectroscopic studies of poly(methyl methacrylate) doped with a new sulfur‐containing ligand and its cobalt(II) complex during γ‐radiolysis

Infrared Studies on Polymethyl Methacrylate Doped with a Sulphur-Containing Ligand and Its Cobalt (II) Complex During Gamma Radiolysis

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