Self-diffusion and gelation in benzyl alcohol solutions of cellulose triacetate

Gafurov, Ilshat; Skirda, V. D.; Maklakov, A.I.; Ryskina, I.I.

doi:10.1016/0032-3950(88)90458-3

Cited by 7 publications

(11 citation statements)

References 4 publications

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“…10 The appearance of the SDC spectrum during polymerization was observed earlier by studying gelatination in some systems [2,3,26]. Such spectrum is a characte¡ feature of a polymerization process.…”

Section: + Pf (Pfg(te)exp(-k2tdd~g) + Pfs(te)s@(drst~)exp(-k2tadfs)dmentioning

confidence: 68%

“…It was shown that the self-diffusion behavior of molecules not belonging to the gel network (the sol fraction) provides enough information about polymerization. For example, during gelatination in water solutions of gelatin ("fine" gel) as well as during polymerization of cellulose triacetate in the benzyl alcohol ("coarse" gel) the same effects were found [2,26]. The average SDC value and the spectrum width increased as the portion of the gel fraction increased.…”

Section: Prs (T~)f ~(Drs T E) Exp(-k2tadfs) D Dfsmentioning

confidence: 69%

“…We investigated earlier some systems [26] in which gelatination leads to the formation of a coarse network. It was shown that the self-diffusion behavior of molecules not belonging to the gel network (the sol fraction) provides enough information about polymerization.…”

Section: Prs (T~)f ~(Drs T E) Exp(-k2tadfs) D Dfsmentioning

confidence: 99%

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Rodlike polymer gelatination as studied by PFG NMR: Fibrin polymerization in human plasma

Mutina

Skirda

2004

Appl. Magn. Reson.

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The structure formation in rodlike polymers was investigated by the example of polymerization of Ÿ237 rodlike molecules in native plasma. Translational mobility of fibrin molecules in anticoagulated plasma and native plasma during fibrin polymerization was studied by pulse field gradient nuclear magnetic resonance. It was shown that the diffusion decay of anticoagulated plasma can be fitted by the sum of exponents and fibrin molecules have the self-diffusion eoefficient D r of 1.53.10 -~' m2/s. The diffusion decay of native plasma during fibrin polymerization becomes nonexponential and is described by the lognormal distribution of fibrin self-diffusion coefficients. Qualitative and quantitative changes of the spectrum of fibrin self-diffusion coefficients (SDCs) during polymerization were investigated and analyzed. A symmetrical broadening of the spectrum at the beginning of polymerization and symmet¡ narrowing at its final stages with conservation of the most probable SDC was explained on the basis of the hypothesis about the simultaneous action of fibrin polymerization and lyses.

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Section: + Pf (Pfg(te)exp(-k2tdd~g) + Pfs(te)s@(drst~)exp(-k2tadfs)dmentioning

confidence: 68%

Section: Prs (T~)f ~(Drs T E) Exp(-k2tadfs) D Dfsmentioning

confidence: 69%

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Rodlike polymer gelatination as studied by PFG NMR: Fibrin polymerization in human plasma

Mutina

Skirda

2004

Appl. Magn. Reson.

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“…Recently PFG NMR was applied to investigate some simple systems: three-dimensional (3D) networks of radiation crosslinked poly (butadiene) 13) , the hydrogels of gelatine 14) and of cellulose triacetate 15) . The translational mobility was shown to differ both qualitatively and quantitatively from that of linear molecules.…”

Section: Introductionmentioning

confidence: 99%

“…The qualitative difference consists in the anomalous diffusion of chains forming 3D network, i. e., in the time dependence of the effective selfdiffusion coefficient. This feature allows one to differentiate sol and gel components, which gives the possibility to use the PFG NMR method for the study of gel-formation kinetic processes [14][15][16] . Also it was shown 13) that a correlation exists between the value of the effective selfdiffusion coefficient and the cross-link density of the network.…”

Section: Introductionmentioning

confidence: 99%

Investigation of translational motion of poly(ethylene glycol) macromolecules in poly(methacrylic acid) hydrogels

Skirda¹,

Aslanyan

Philippova

et al. 1999

Macromol. Chem. Phys.

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SUMMARY: The translational mobility of linear macromolecules of poly(ethylene glycol) (PEG) within a weakly cross-linked poly(methacrylic acid) (PMAA) hydrogel was investigated by means of the pulse field gradient (PFG) NMR method in order to reveal the effect of PMAA/PEG complex formation. It was found that inside the collapsed gel a fraction of the PEG molecules has self-diffusion characteristics like those of the network chains. This suggests the formation of an interpolymer complex, as a result of which some linear molecules acquired the dynamic properties of the network chains. Another fraction of the PEG macromolecules inside the collapsed gel enjoyed free diffusion, for they were not included in the complex with PMAA. In contrast, within the swollen gel (at concentrations of PEG higher than 5 wt.-%) the self-diffusion coefficient of all PEG molecules was independent of the diffusion time, which indicates an absence of the interpolymer complex (or at least that its lifetime is negligibly short).

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NMR study of the structure of aqueous gelatine gels and the process of their formation

Gafurov

Skirda

Maklakov

et al. 1989

Polymer Science U.S.S.R.

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Self-diffusion and gelation in benzyl alcohol solutions of cellulose triacetate

Cited by 7 publications

References 4 publications

Rodlike polymer gelatination as studied by PFG NMR: Fibrin polymerization in human plasma

Rodlike polymer gelatination as studied by PFG NMR: Fibrin polymerization in human plasma

Investigation of translational motion of poly(ethylene glycol) macromolecules in poly(methacrylic acid) hydrogels

NMR study of the structure of aqueous gelatine gels and the process of their formation

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