Kinetics of oligomer curing

Иржак, В. И.; Mezhikovskii, S.M.

doi:10.1070/rc2008v077n01abeh003752

Cited by 15 publications

(9 citation statements)

References 6 publications

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“…The advantage of HBPs over dendrimers is that their synthesis is relatively simple and involves one step. Most HBPs described in the literature are synthesized by the polycondensation of АВ 2 , АВ 3 , and АВ 4 mono mers or via the combination of monomers (A 2 + B 3 , АВ 2 + А 2 В) [1][2][3][4][5][6][7]. An important advantage of HBPs is that their physicochemical characteristics can be varied in a wide range.…”

Section: Introductionmentioning

confidence: 99%

Structural and conformational properties of hyperbranched copolymers based on perfluorinated germanium hydrides

et al. 2012

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Two series of hyperbranched copolymers based on perfluorinated germanium hydrides of various topological structures are studied in dilute chloroform solutions by the methods of molecular hydrodynamics and optics. The first series is composed of copolymers with various molecular masses (from 2.3 × 10 4 to 31 × 10 4 ) that contain rigid linear chains between branching points and various amounts of branching points in cascades of the dendritic fragment, while the second series is comprised of copolymers that, at close branch ing degrees, on average, are characterized by a looser structure owing to a large amount of linear units at the periphery of macromolecules with M = (2.5 × 10 4 )-(23 × 10 4 ). Macromolecules of the studied polymers have compact dimensions and a high density of the polymer substance; their shape asymmetry is low. In terms of these characteristics, they approach dendrimers. At a fixed molecular mass, the copolymers with a loose structure have higher dimensions of macromolecules and higher intrinsic viscosities.

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Section: Introductionmentioning

confidence: 99%

Structural and conformational properties of hyperbranched copolymers based on perfluorinated germanium hydrides

et al. 2012

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“…where it is difficult to measure the speed of processes in situ. However, to realize this possibility, it is necessary to experimentally determine the frequency functions, participating in the equations (1), (7) and (8). Therefore, it is necessary to study the elementary processes that determine the function φ (υ, τ ) on model bodies and to make sure that they leave a significant imprint on the microrelief.…”

Section: Approaches To the Use Of Morphological Memorymentioning

confidence: 99%

“…Also, if the transfer of the body from the medium where it was obtained to the medium of usage takes place without violating its integrity, it is reasonable to put the solution for equation (8) in the form:…”

Section: Model Of the Microrelief Change With Body Usagementioning

confidence: 99%

“…Solution of these boundary value problems over a wide range of y will allow one to identify the main relations of the microrelief with the speeds of the elementary processes as well as to describe the response of the function φ (υ, τ ) to the change of y and to develop algorithms for calculating the parameters of elementary processes from the experimental data about the function φ (υ, τ ) at different y. Currently, methods for solving such problems and the models of elementary processes are developed, and experimental data, allowing one to judge the main features of the microrelief and to make a phenomenological model of its formation, is accumulated [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. For the quantitative study of the relation between the parameters of microrelief and the elementary processes, it is advisable to start with the simplest system, one in which the initiator molecules are rapidly converted into the nuclei of chain macromolecules, their number in the system reaching the value N 1 = C B V 0 .…”

Section: Approaches To the Use Of Morphological Memorymentioning

confidence: 99%

“…It is known that in such a solution, the nucleation and growth of the polymeric macromolecules occurs, which form the aggregates followed by their assembly into a polymeric body, and the macromolecules on the body's surface form the microrelief [3][4][5][6]. During the transition to the body structure, the condition of each macromolecule can change significantly, depending upon the relaxation time of its state [7,8]. As a result, if the body is formed quickly and the complete relaxation of the macromolecule state is not provided, the structure of the microrelief appears dependent on the kinetics of the body formation.…”

Section: Introductionmentioning

confidence: 99%

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Morphological memory of polymeric bodies

Мелихов¹,

Алексеева²,

Рудин³

et al. 2015

Nanosist.: fiz. him. mat.

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The model of microrelief formation on the surface of polymers was formulated, describing the connection between the microrelief structural elements' distribution function on the states with the kinetics of macromolecule formation, aggregation and aggregates' integration into the polymer body. Methods for calculating the kinetics of these processes, using experimental data on the microrelief properties, were developed. The developed methods have proven effective in the study of microrelief on films obtained by the evaporation of o−xylene and toluene solutions of polystyrene, as well as polystyrene granules' microrelief. The hierarchical structures were found on the surface of these bodies, from which it was possible to "extract" information about the polymerization and aggregation of the polystyrene macromolecules. The obtained data are summarized in the form of a morphological memory representation of the polymer bodies, consisting in the long-term preservation of nonequilibrium structures available for study without destroying the body, as well as the possibility to use the results of the study to describe the kinetics of these structures' formation.

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