Complementarity of small-angle neutron and X-ray scattering methods for the quantitative structural and dynamical specification of dendritic macromolecules

Куклин, А. И.; Ozerin, А. N.; Islamov, Akhmed; Muzafarov, А. М.; Gordeliy, Valentin; Rebrov, Eugeniy A.; Ignat’eva, G. M.; Татаринова, Е. А.; Mukhamedzyanov, Ruslan I.; Ozerina, L. A.; Sharipov, Eugeniy Yu.

doi:10.1107/s0021889803006186

Cited by 35 publications

(15 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The properties of such samples have been stud ied previously by adiabatic calorimetry, 24,25 SAXS and SANS, 26 and NMR spectroscopy. 27 We measured the vis cosity of dendrimers in dilute solutions in toluene and the dendrimer density.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and study of the properties of the homologous series of polyallylcarbosilane dendrimers and their nonfunctional analogs

et al. 2004

View full text Add to dashboard Cite

A synthetic route combining the preparation of functional and nonfunctional carbosilane dendrimers has been developed. Using this route, two representative homologous series of carbosilane dendrimers have been prepared. The use of nonfunctional dendrimer derivatives ensures the possibility of performing long term experiments both in solution and in the bulk. The intrinsic viscosity and the density of the specimens studied do not depend on the genera tion number. The obtained dendrimers of later generations were studied by atomic force microscopy and light scattering.

show abstract

Section: Resultsmentioning

confidence: 99%

Synthesis and study of the properties of the homologous series of polyallylcarbosilane dendrimers and their nonfunctional analogs

et al. 2004

View full text Add to dashboard Cite

show abstract

“…The poly(carbosilane) dendrimers containing four function branch centers of the third, fourth and fifth generations [12][13][14][15][16] were investigated in the polymer block and in tetrachloride COl 4 solution.…”

Section: Methodsmentioning

confidence: 99%

Structure and dynamics of poly(carbosilane) dendrimers as revealed by pulsed field gradient NMR technique

et al. 2005

View full text Add to dashboard Cite

The self-diffusion of poly(carbosilane) dendrimer macromolecules solutions in the highconcentration region starting from the polymer block was investigated by pulsed fietd gradient nuclear magnetic resonance techniques. A restrietion of diffusion was observed for the concentration region of 50-95 wt% of dendrimer in tetrachloride CC14 solutions. This phenomenon has been explained by the formation of solutions at a thermodynamical nonequilibrium. A theoretical approach on the basis of thermodynamics and statistical mechanics was developed. lntroductionThe unique physical-chemical properties of dendrimers stimulate wide theoretical and experimental investigations of these polymers. There are a lot of papers devoted to the dendrimer spatial structure and dynamics of the molecular motion.Pulsed field gradient nuclear magnetic resonance (PFG NMR) became the method of choice, among other physical techniques, to characterize the dendrimer structural and translational mobility [1][2][3][4][5][6][7][8][9]. This technique gives the opportunity to measure directly molecular self-diffusion coefficients in dendrimer solutions starting from the polymer in block (the dendrimer itself).The main part of investigations were carried out for a relatively Iow dendrimer concentration (less than 60 wt%). The dendrimer self-diffusion may be characterized by a single self-diffusion coefficient dependent on the concentration [3][4][5][6][7][8][9]. In this case, the dendrimer solutions are homogeneous systems without any macromo[ecular associations and the self-diffusion coefficient is determined by the translational motion of separate macromolecules.

show abstract

“…The most important results turned out to be the data on dependence of characteristic Along with those obtained on capacity of dendrimer interior sphere, [24][25][26][27] the new results allowed us to characterize unambiguously carbosilane dendrimers as polymer objects not only according to formal features-presence of a great number of repeating units in molecular structure, but also to the ability to swell and shrink depending on a solvent quality. Figure 11 illustrates the operation done based on SANS contrast variation experiment results indicating the amount of solvent within hydrodynamic volume of carbosilane dendrimer.…”

Section: Carbosilane Dendrimersmentioning

confidence: 99%

From the discovery of sodiumoxyorganoalkoxysilanes to the organosilicon dendrimers and back

Muzafarov

Rebrov

2008

J. Polym. Sci. A Polym. Chem.

Self Cite

View full text Add to dashboard Cite

Upon being discovered 20 years ago, sodiumoxyorganoalkoxysilanes became the key to the world of organoelement dendrimers. Even considering the great variety of objects that had appeared in this area during the last 20 years, the organosilicon dendrimers are still one of the most actual objects in this class. Above all, this is fair concerning the carbosilane systems. The high reactivity of the functional groups, the well controlled chemistry of their transformations, and the inertness of the molecular skeleton are the reason for making these systems highly actual in two main regards: as model objects for the deep research of the dendrimers' properties and as polyfunctional matrixes for numerous derivatives. In this review, we were mainly focusing on the importance of the former part. In the conclusion, we showed the motivation for further development of this area both in regard of synthesis of new carbosilane systems and further development of siloxane dendrimers.

show abstract

Complementarity of small-angle neutron and X-ray scattering methods for the quantitative structural and dynamical specification of dendritic macromolecules

Cited by 35 publications

References 11 publications

Synthesis and study of the properties of the homologous series of polyallylcarbosilane dendrimers and their nonfunctional analogs

Synthesis and study of the properties of the homologous series of polyallylcarbosilane dendrimers and their nonfunctional analogs

Structure and dynamics of poly(carbosilane) dendrimers as revealed by pulsed field gradient NMR technique

From the discovery of sodiumoxyorganoalkoxysilanes to the organosilicon dendrimers and back

Contact Info

Product

Resources

About