Recent advances in the NMR of solid polymers

McBrierty, Vincent J.; Douglass, D. C.

doi:10.1002/pol.1981.230160105

Cited by 287 publications

(136 citation statements)

References 234 publications

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“…The maximum diffusive path length L can be estimated using the approximate eq 7. [29][30][31] For T 1F H of 5 ms and a effective spin diffusion coefficient, 32,33 we adopted the Painter-Coleman association model (PCAM) to predict thermodynamic properties. However, all the blends investigated in this study contain a self-associating polymer B and a nonself-associating polymer A, which can interact with B.…”

Section: Resultsmentioning

confidence: 99%

Miscibility and Hydrogen Bonding in Blends of Poly(vinylphenol-co-methyl methacrylate) with Poly(ethylene oxide)

2001

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Blends of poly(vinylphenol-co-methyl methacrylate) (PVPh-co-PMMA) with poly(ethylene oxide) (PEO) were prepared by solution casting from tetrahydrofuran (THF) solution. The miscibility behavior and hydrogen bonding of blends were investigated by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), and solid-state nuclear magnetic resonance (NMR). Experimental results indicate that PEO was miscible with PVPh-co-PMMA as shown by the existence of single composition-dependent glass transition temperatures over the entire composition range by DSC. In addition, a negative polymer-polymer interaction energy density "B" was calculated based on the melting depression of PEO using the Nishi-Wang equation. Solid-state NMR reveals single-exponential decay of proton spin-lattice relaxation times in the rotating frame (T 1F H ) in the amorphous PVPh-co-PMMA phase. Furthermore, FTIR and solid-state NMR results reveal that at least three competing equilibria are present in the blend; self-association of PVPh-co-PMMA copolymer (hydroxyl-hydroxyl and hydroxyl-carbonyl) and hydroxyl-ether interassociation between PVPh and PEO. Quantitative results show that although the hydroxyl-ether interassociation is favored at room temperature, the hydroxyl-carbonyl self-association dominates at higher temperatures (>70°C). The Painter-Coleman association model (PCAM) can predict three interacting functional groups based on our experimental results at various temperatures.

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Section: Resultsmentioning

confidence: 99%

Miscibility and Hydrogen Bonding in Blends of Poly(vinylphenol-co-methyl methacrylate) with Poly(ethylene oxide)

2001

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“…Relaxation times of solid polymers are not only determined by dynamic phenomena. There exists a contribution from the static mechanism of spin diffusion [18]. When two proton populations have different spin temperatures at a given time, they will tend to a common spin temperature by spin diffusion.…”

Section: Molecular Dynamics Of the Blends Ipp/sppmentioning

confidence: 99%

“…In particular, spin-lattice relaxation times are very sensitive to the short spatial proximity of interacting dipole moments of the protons. Wide-line 1 H NMR permits the determination of different phases, interphases and the measurement of the crystallinity in polymers [17][18][19]. High-resolution solid-state 13 C NMR is a selective method that permits following the motional behavior of each carbon of the repeat unit independently [20,21].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the morphology of iPP/sPP blends with various compositions

Bourbigot¹,

Garnier²,

Revel³

et al. 2013

Express Polym. Lett.

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Abstract. The paper investigates the morphology and the structural properties of blends of isotactic polypropylene (iPP) and syndiotactic polypropylene (sPP) having different compositions using different techniques. Solid-state nuclear magnetic resonance (NMR) permits via appropriate sequence to measure the composition, conformation and dynamics, and intimacy of mixing of polymeric materials. Measurement of relaxation times gives information on local structure of phases with different mobility. The morphology is directly related to the structural organization of the blends. The crystallization rate decreases as a function of the sPP content. The minor component is dispersed as a nodule in the main component of the blend and it plays the role of nucleating agent on it. Besides, morphology changes occur for the composition 50/50 (wt/wt) of the blend iPP/sPP. Different phases are identified, namely free amorphous, constrained amorphous and crystalline regions which exhibit different molecular mobilities. It is also shown at the interphase matrix-nodules, the nodules create a constrained amorphous zone.

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“…[15][16][17][18] The measured T 1 H values for all specimens, including pristine PDMS, PMMA and PTFEMA, are shown in Figure 3a. In addition, the T 1 H values for the PDMS macromonomer with M n ¼1700 and 4700 were 1.16 s and 1.25 s, respectively.…”

Section: Cp-mas Spectramentioning

confidence: 99%

“…The diameter of the homogeneously distributed area (domain size) was calculated using the following formula 16 and average T 1 H value:…”

Section: Cp-mas Spectramentioning

confidence: 99%

The systematic study of the microstructure of crosslinked copolymers from siloxane macromonomers and methacrylates by changes in composition and components

Yokota

Miwa

Ajiro

et al. 2012

Polym J

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Recent advances in the NMR of solid polymers

Cited by 287 publications

References 234 publications

Miscibility and Hydrogen Bonding in Blends of Poly(vinylphenol-co-methyl methacrylate) with Poly(ethylene oxide)

Miscibility and Hydrogen Bonding in Blends of Poly(vinylphenol-co-methyl methacrylate) with Poly(ethylene oxide)

Characterization of the morphology of iPP/sPP blends with various compositions

The systematic study of the microstructure of crosslinked copolymers from siloxane macromonomers and methacrylates by changes in composition and components

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