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1.
V. Yu. Baranovskii L. L. Yasina M. V. Motyakin I. I. Aliev S. Shenkov M. Dimitrov N. Lambov A. M. Wasserman 《Polymer Science Series A》2006,48(12):1304-1309
Partially water-swellable polymer networks were synthesized on the basis of poly(acrylic acid) and various macrodiisocyanates. Hydrophilic and hydrophobic local regions were revealed in swollen networks (hydrogels) by means of the spin probe technique. The local mobility in hydrophobic regions depends on the macrodiisocyanate structure; however, it is substantially lower than that in hydrophilic regions for all gels. It was assumed that the presence of hydrophobic and hydrophilic regions and the difference in their local dynamics must have a substantial effect on the pharmacokinetics of release of drugs immobilized in these hydrogels. 相似文献
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A discussion is given of the relation between the maximum functionaltheorem and Schwinger's variational principle, and it is shownthat the bound given by Schwinger's principle is better thanor the same as that given by the maximum functional theorem. 相似文献
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Vasserman A. M. Kovarskii A. L. Yasina L. L. Buchachenko A. L. 《Theoretical and Experimental Chemistry》1977,13(1):19-23
Theoretical and Experimental Chemistry - 相似文献
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Van Zandt LL 《Physical review letters》1986,57(16):2085-2087
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M. V. Motyakin L. L. Yasina N. A. Churochkina V. G. Vasil’ev L. Z. Rogovina A. M. Vasserman A. R. Khokhlov 《Polymer Science Series B》2006,48(1):23-27
Spin-probe ESR spectroscopy is employed to study the local mobility in junctions of physical networks in gels of hydrophobically modified polyacrylamides. These junctions are formed owing to self-association of alkyl groups containing 12 carbon atoms. It is shown that, irrespective of the mode of covalent binding between the alkyl groups and the polymer backbone (via either ester or amide groups) and the degree of macromolecule blockiness, the local mobility in the gel network junctions is almost an order of magnitude lower than that in the hydrophobic core of a micelle of the low-molecular-mass surfactant sodium dodecyl sulfate. 相似文献
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Local mobility and structure of cationic amphiphilic diblock copolymer micelles in aqueous solutions
M. V. Motyakin E. A. Lysenko P. S. Chelushkin L. L. Yasina A. M. Vasserman 《Polymer Science Series A》2010,52(3):235-242
The local mobility and organization of micelles formed by the cationic diblock copolymer PS-poly(N-ethyl-4-vinylpyridinium bromide) in dilute aqueous solutions is studied by spin-probe ESR spectroscopy. Micelles composed
of a hydrophobic PS core and a lyophilizing polyelectrolyte corona are prepared by two methods: dialysis from a nonselective
solvent and direct dispersion of the diblock copolymer in water under long-term heating. Velocity-sedimentation studies and
static and dynamic light-scattering measurements show that the micelles obtained by dialysis have smaller mean hydrodynamic
sizes and weight-average molecular masses and are less polydisperse than micelles prepared by direct dispersion. The ESR spectra
of spin probes localized in micelles of both types are found to be identical. This finding suggests that their local structure
is independent of the dispersion procedure and molecular-mass characteristics. Probes are localized in the outer layer of
the PS core near the core/shell boundary, and their local mobility is a factor of ∼2 higher than the local mobility of probes
in the phase of the solid PS. It is inferred that the structure of the outer layer of the PS core in micelles is looser than
the structure of PS in the solid phase. The localization sites of spin probes are partially penetrated by water. 相似文献
10.
Wasserman AM Kasaikin VA Zakharova YA Aliev II Baranovsky VY Doseva V Yasina LL 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2002,58(6):1241-1255
Molecular dynamics and organization of the micellar phase of complexes of linear polyelectrolytes with ionogenic and non-ionogenic surfactants was studied by the ESR spin probe method. Complexes of polyacrylic acid (PAA) and sodium polystyrenesulfonate (PSS) with alkyltrimethylammonium bromides (ATAB), as well as complexes of poly-N,N'-dimethyldiallylammonium chloride (PDACL) with sodium dodecylsulfate (SDS) were studied. The micellar phase of such complexes is highly organized molecular system, molecular ordering of which near the polymeric chain is much higher than in the 'center' of the micelle, it depends on the polymer-detergent interaction, flexibility of polymeric chain and length of carbonic part of the detergent molecule. Complexes of polymethacrylic acid (PMAA) with non-ionic detergent (dodecyl-substituted polyethyleneglycol), show that the local mobility of surfactant in such complexes is significantly lower than in 'free' micelles and depends on the number of micellar particles participating in formation of complexes. 相似文献