Proton and Carbon-13 Nuclear Magnetic Resonance Studies of Poly(vinyl acetate)

Wu, Ting Kai; Ovenall, Derick W.

doi:10.1021/ma60042a015

Cited by 44 publications

(19 citation statements)

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“…The C V resonance of CEV triads is thus observed at δ C ) 20.01 ppm and δ H ) 1.62 ppm (cross-peak d). It shows correlation to two methylene protons two bonds away at δ H ) 1.55 ppm (cross-peak d 1 ) and δ H ) 2.32 ppm (cross-peak d 2 ) due to the R V γ C and R C γ V groups, respectively, and a three-bond correlation to the CH CEVXX methine proton at δ H ) 4.91 ppm (cross-peak d 3 ).…”

Section: Resultsmentioning

confidence: 99%

“…The resonance at δ C ) 207.62 ppm is observed due to the occurrence of a C and a V next to E in the ECE triad and gives rise to CECEV pentad. The ketone carbonyl shows correlations to R C C protons at 2.57 ppm (cross-peak w′ 3 ) and R C γ V protons at 2.34 ppm (cross-peak w′ 2 ). The highest ketone carbonyl carbon resonance at δ C ) 206.00 ppm (cross-peak v) is due to XECVX pentads.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5][6] This is due to the commercial significance of these polymers in diverse fields. This paper reports 2D NMR studies to elucidate the structures present in poly(ethylene-co-vinyl acetate-co-carbon monoxide) (poly-EVC) and to assign its 1 H and 13 C NMR resonances.…”

Section: Introductionmentioning

confidence: 99%

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2D NMR Studies of Poly(ethylene-co-vinyl acetate-co-carbon monoxide)

et al. 2007

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A series of poly(ethylene-co-vinyl acetate-co-carbon monoxide) terpolymer samples with varying monomer compositions were studied using a variety of one-and two-dimensional nuclear magnetic resonance (NMR) techniques at 750 MHz. Samples were characterized in deuterated 1,4-dichlocrobenzene-d 4 at high temperature (120°C) to overcome the signal loss and broadening due to T 2 relaxation. Identification of major triads formed due to the addition of the three monomers in different permutations was facilitated by the use of different 2D techniques such as gradient assisted heteronuclear single-quantum correlation (gHSQC), gradient selected heteronuclear multiple-bond correlation (gHMBC), and gradient assisted HSQC-TOCSY. Detection of unusual structures formed due to the addition of carbon monoxide to vinyl acetate or structures due to the inversion of vinyl acetate was also possible. Because of improved dispersion the study was not restricted to the triad level, but in some cases pentads could also be identified. Distinct resonances of chain ends and short-chain branches were also observed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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2D NMR Studies of Poly(ethylene-co-vinyl acetate-co-carbon monoxide)

et al. 2007

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“…[7,8] tail-tail connectivity) would be present in the polymer, (iii) which kinds of termination or transfer reactions were encountered, (iv) and to which extent the polymerization proceeded in a stereoselective fashion, furnishing polymers with a controlled tacticity (relative stereochemistry of the repeating units). Moreover, the analysis of the microstructure by means of 1 H and 13 C NMR spectroscopy turned out to be less straightforward than in the case of poly(vinyl ether)s and poly(vinyl acetate), [11][12][13][14][15][16] probably due to the inherent rigidity of the obtained poly(vinyl glycoside)s and the presence of the chiral carbohydrate substituents.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and ¹³C NMR Spectroscopy of Model Compounds for the Microstructure Analysis of Poly(Vinyl Glycoside)s

Yuan

Frauenrath

2008

Eur J Org Chem

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A series of glycosylated diol and triol derivatives was synthesized in order to serve as model compounds for the analysis of the stereochemistry, regiochemistry, and defect structures of poly(vinyl glycoside)s.13 C NMR spectroscopic analysis of these compounds revealed that the attached chiral carbohydrate substituents induced a strong correlation of the chemical shifts of both the anomeric C and the α-C atom of

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“…Solvent CDC13 , 10 wt/volo/o, 55 oc; pulse width 90°, number of scans[4][5][6][7][8][9][10][11][12][13][14][15][16] Effect of pulse repetition time on relative peak intensity and observed tacticity for radically prepared PMMA by 500 MHz 1 H NMR.…”

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Stereochemistry of Polymers

Hatäda

Kitayama

2004

NMR Spectroscopy of Polymers

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When a polymer has stereochemical isomerism within the chain, its properties often depend on the stereochemical structure. Thus the analysis of the stereochemistry of polymers is important and NMR spectroscopy has been the most valuable tool for this purpose. Definition of TacticityIn polymers of vinyl monomers CH 2 =CH-X or vinylidene monomers CH 2 =CXY, the main-chain carbons having substituent group(s) are termed "pseudo-asymmetric" since, if the chain ends are disregarded, such carbons do not have the four different substituents necessary to qualify for being truly asymmetric. Nevertheless, they have the possibility of relative handedness. The simplest regular arrangements along a chain are the isotactic structure, in which all the substituents are located on the same side of the zigzag plane representing the chain stretched out in an all-trans conformation. The structure is often represented by a "rotated Fischer projection" in which the main-chain skeleton is represented by a horizontal line (Eq. 3.1). RNK. Hatada et al., NMR Spectroscopy of Polymers © Springer-Verlag Berlin Heidelberg 2004 74 3 Stereochemistry of PolymersFor a vinyl polymer, two types of diads should be considered, which are designated as meso (m) and racemo (r). Using these notations, a sequence in an isotactic polymer can be represented as -mmmmmm-and that in a syndiotactic polymer as -rrrrrrrr-. In reality, however, purely isotactic or syndiotactic polymers are rarely obtainable but the extent of regularity is always the question to be analyzed. Tacticity [1] is the term used for defining such stereochemical features of polymers. 1

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Proton and Carbon-13 Nuclear Magnetic Resonance Studies of Poly(vinyl acetate)

Cited by 44 publications

References 3 publications

2D NMR Studies of Poly(ethylene-co-vinyl acetate-co-carbon monoxide)

2D NMR Studies of Poly(ethylene-co-vinyl acetate-co-carbon monoxide)

Synthesis and ¹³C NMR Spectroscopy of Model Compounds for the Microstructure Analysis of Poly(Vinyl Glycoside)s

Stereochemistry of Polymers

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Proton and Carbon-13 Nuclear Magnetic Resonance Studies of Poly(vinyl acetate)

Cited by 44 publications

References 3 publications

2D NMR Studies of Poly(ethylene-co-vinyl acetate-co-carbon monoxide)

2D NMR Studies of Poly(ethylene-co-vinyl acetate-co-carbon monoxide)

Synthesis and 13C NMR Spectroscopy of Model Compounds for the Microstructure Analysis of Poly(Vinyl Glycoside)s

Stereochemistry of Polymers

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Product

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Synthesis and ¹³C NMR Spectroscopy of Model Compounds for the Microstructure Analysis of Poly(Vinyl Glycoside)s