Conformational energies of deuterated stereoregular poly(methyl methacrylate)

O’Reilly, James M.; Teegarden, David M.; Mosher, R. A.

doi:10.1021/ma50007a015

Cited by 30 publications

(29 citation statements)

References 2 publications

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“…Different van't Hoff energies indicate different relaxation times can be understood by the common assumption that only the staggered conformations need to be corresponding to specific structural relaxations. Similar experimental observations were also reconsidered: trans conformation (t) with dihedral angle f Å 0Њ and gauche conformations (g and ported 14,15 for vibrational band-pairs exhibiting a change in temperature dependence at a temperag) with dihedral angles f Å {120Њ. The trans conformation prevails while the fractions of the ture near T g and a molecular motion mechanism was applied.…”

Section: Methodsmentioning

confidence: 80%

“…Substitution of these relations into the van't Hoff times controlling a structural relaxation. 11,12,14,15 Then the equilibrium constant, K is defined by relation yields Figure 3. Difference spectra of PAA obtained at 10ЊC intervals from 50 to 110ЊC.…”

Section: Methodsmentioning

confidence: 99%

“…A similar apture stability of better than {0.1ЊC. Calculation of the spectra was performed by Grams/386 (Gaproach was followed to study conformational changes of poly(vinyl chloride), 11,12 poly(methyl lactic Industries Co.) methacrylate) (PMMA), 13,14 and of deuterated PMMA 15 of various tacticity, and the conformational energies acquired were confronted with the…”

Section: Introductionmentioning

confidence: 99%

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FTIR studies of conformational energies of poly(acrylic acid) in cast films

Dong

Ozaki

Nakashima

1997

J. Polym. Sci. B Polym. Phys.

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Fourier transform infrared (FTIR) spectroscopic measurements have been undertaken to estimate the conformational energies of poly(acrylic acid) (PAA) cast films in the temperature range of 40–130°C. The temperature dependence of the IR spectra in the C=O stretching region has been analyzed to yield the side‐chain and backbone conformational energies. The estimated energies are close to those previously obtained by polarized Raman spectroscopic measurements for PAA solutions. Combining the FTIR value of conformational energy with the simplified rotational isomeric state (RIS) model proposed in the Raman analysis provides a persistence length in accordance with earlier SAXS experiments. The data also agree with the Gibbs‐DiMarzio predictions, further substantiating the validity of the analysis. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys, 35: 507–515, 1997

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Section: Methodsmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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FTIR studies of conformational energies of poly(acrylic acid) in cast films

Dong

Ozaki

Nakashima

1997

J. Polym. Sci. B Polym. Phys.

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“…Modes appearing between 1300 and 1050 cm -1 appear to be particularly sensitive to tacticity and conformation and have been widely studied. [1][2][3][4][5][6][7][8][9][10][11][12] Unfortunately, the intensity changes that have been observed in this region of the spectrum have been interpreted in different ways. In early work, for example, Havriliak and Roman 2 sought to understand why simple molecules like methyl acetate have just one (intense) band in this region of the spectrum, assigned to the C-O ester stretching mode, while PMMA has a number of bands.…”

Section: Introductionmentioning

confidence: 99%

Concerning the Determination of Conformational States in Polymers by Infrared Spectroscopy: A Study of Poly(methyl methacrylate)

Painter

Huang

2008

Macromolecules

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Changes in the infrared spectra of poly(methyl methacrylate) as a function of temperature have been examined. The results presented here, together with a consideration of normal coordinate calculations reported in the literature, suggest that previous assignments of bands in the 1300-1050 cm -1 region of the spectrum to specific conformations of the ester pendant group are incorrect. Certain bands in this and other regions of the spectrum are nevertheless very sensitive to temperature. It is proposed that this sensitivity is a function of both conformational effects and vibrational relaxation effects. The latter are usually neglected in vibrational spectroscopic studies of polymers, and it is proposed that more attention be paid to changes in band shapes when considering changes in the spectra of polymers as a function of temperature.

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“…The reaction temperature (45 °C) is much below than the glass transition temperature of the P2VP. Below the glass transition temperature, the conformational energies should involve only changes in the side chain because the backbone conformation is frozen at glass transition temperature 25. In homopolymer P2VP, side chain pyridine moieties are covalently attached with vinyl backbone of the polymer chain through a sigma bond.…”

mentioning

confidence: 99%