NMR Spectroscopy in Polymer Science

Ando, Isao; Kobayashi, Masatoshi; Kanekiyo, Masahito; Kuroki, Shigeki; Ando, Shinji; Matsukawa, Shingo; Kurosu, Hiromichi; Yasunaga, Hidekazu; Amiya, Shigetoshi

doi:10.1016/b978-0-08-050612-8.50010-6

Cited by 13 publications

(6 citation statements)

References 224 publications

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“…To interpret the 13 C NMR spectra, it is necessary to recall that for any head-to-head sequence there must be a tail-to-tail adjacent one …”

Section: Resultsmentioning

confidence: 99%

“…19 The splitting of the head-to-head sequences in PVA chains by metaperiodate is not symmetric and gives rise to two types of carboxylic moieties indicated in Figure 1 as "type 1" and "type 2", respectively. Besides the typical PVA resonances around 70 ppm and at 40-50 ppm, due to the -CH and to the -CH 2 groups of the backbone, 20 the carboxylic groups generated by oxidation of the aldehydic end groups are magnetically nonequivalent.…”

Section: Resultsmentioning

confidence: 99%

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Tailoring of Physical and Chemical Properties of Macro- and Microhydrogels Based on Telechelic PVA

et al. 2002

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Poly(vinyl alcohol), PVA, is amenable to several structural modifications because of the presence of the hydroxyl moiety in the backbone. The chemical versatility of this polymer can be used for the obtainment of new wall-to-wall pH-responsive PVA chemical hydrogels and for the preparation of air-filled microspheres, for example, microbubbles. Here, we report on the characterization of the physical and chemical properties of these novel networks that can be potentially used in different biomedical applications as controlled drug delivery and as ultrasonic contrast agent.

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“…To interpret the 13 C NMR spectra, it is necessary to recall that for any head-to-head sequence there must be a tail-to-tail adjacent one …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tailoring of Physical and Chemical Properties of Macro- and Microhydrogels Based on Telechelic PVA

et al. 2002

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“…The theory and experimental of the MRI technique have been described and reviewed 30, 31. This technique allows images of the water distribution inside the gel to be obtained without any physical slicing of the polymer, which has found widespread application in hydrogels 32. The change in water content with time can be monitored, thus allowing the study of swelling in real time.…”

Section: Experimental Partmentioning

confidence: 99%

Water Transport Properties of pH‐Responsive Hydrogels Based on Poly(methacrylic acid) with Polyether Side Chains by Magnetic Resonance Imaging

Quijada‐Garrido¹,

Prior-Cabanillas²,

París³

et al. 2009

Macro Chemistry & Physics

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Three pH‐responsive hydrogel families have been synthesized through the photopolymerization of methacrylic acid (MAA) with: i) a poly(ethylene glycol) macromonomer, P(MAA‐co‐PEGMEMA), ii) a poly(propylene glycol) macromonomer, P(MAA‐co‐PPGMEMA), and iii) the two above‐mentioned macromonomers, to give a terpolymer P(MAA‐co‐PEGMEMA‐co‐PPGMEMA). Their swelling properties at pH 7 have been investigated by magnetic resonance imaging (MRI). Equimolecular compositions of both P(MAA‐co‐PEGMEMA) and P(MAA‐co‐PPGMEMA) hydrogels showed the lowest swelling kinetics rates. For P(MAA‐co‐PEGMEMA‐co‐PPGMEMA) hydrogels, the different structure of the side chains established an antagonist effect on the swelling. In addition, from the MRI intensity profiles and taking into account the first stage of the swelling, water diffusion coefficients (D) have been estimated.

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“…Assignment of resonances of the head-to-head methine was carried out according to previous results . Analogous 13 C NMR results were recently obtained by Ando 2 A microcalorimetric titration of the head-to-head sequence in a PVA sample.…”

Section: Resultsmentioning

confidence: 75%

“…36 Analogous 13 C NMR results were recently obtained by Ando. 37 The threshold between the sol and gel phases was followed by DLS because this approach can detect in an unequivocal way the nonergodic behavior of the system without perturbing it in a macroscopic scale. The detection of the gel point is a well-known problem, 38 being related to some extent to the technique used.…”

Section: Resultsmentioning

confidence: 99%

A Dynamic Light Scattering Study of Hydrogels Based on Telechelic Poly(vinyl alcohol)

et al. 2000

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Chemical hydrogels based on poly(vinyl alcohol), PVA, were obtained by reacting telechelic PVA bearing aldehydic groups at both ends of the chain with the hydroxylic moiety of the polymer. These networks were studied by dynamic light scattering around the sol−gel transition threshold. The auto-correlation function, g (2)(q,t), displays nonergodic behavior when the system enters the gel phase. Appropriate ensemble averaging of the g (2)(q,t) yields the dynamic structure factor f(q,t). To extract from the f(q,t) the characteristic parameters of the network, we adopted a model originally proposed for colloidal gels. A correct description of the f(q,t) was obtained. The results were compared with those obtained independently on the same type of hydrogels by equilibrium swelling and compression modulus measurements. A link to macroscopic properties of the gels is also shown.

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NMR Spectroscopy in Polymer Science

Cited by 13 publications

References 224 publications

Tailoring of Physical and Chemical Properties of Macro- and Microhydrogels Based on Telechelic PVA

Tailoring of Physical and Chemical Properties of Macro- and Microhydrogels Based on Telechelic PVA

Water Transport Properties of pH‐Responsive Hydrogels Based on Poly(methacrylic acid) with Polyether Side Chains by Magnetic Resonance Imaging

A Dynamic Light Scattering Study of Hydrogels Based on Telechelic Poly(vinyl alcohol)

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