Light scatter study of the process of formation of the microheterogeneous structure of network polymers based on oligoester acrylates

Volkova, M.V.; Bel'govskii, I.M.; Golikov, I.V.; Semyannikov, V.A.; Mogilevich, M.M.; Indeikin, Ye.A

doi:10.1016/0032-3950(87)90251-6

Cited by 6 publications

(7 citation statements)

References 7 publications

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“…% TEOS, causes difficulties in realization of equilibrium conformations of macromolecules and leads to changes of the free volume in a polymeric material. Such composite morphology seems to be the reason of deterioration of physical and chemical properties, increasing with the increase of inorganic component content [14].…”

Section: Discussionmentioning

confidence: 99%

“…For a composite based on a spatially crosslinked polymer (MGF-9 : TEOS), the influence of the inorganic component is more pronounced. Since, according to the concept of microheterogeneity of radical polymerization, polymer MGF-9 has a granular structure where polymeric grains are bound together into a single frame structure with hydrogen bonds or individual monomer molecules [6,14,15], the introduction of a small amount of inorganic component into MGF-9 : TEOS system (2.5 vol. % TEOS) leads to a significant increase in the glass transition temperature compared to that of pristine polymer (32 °C to 57 °C).…”

Section: Methodsmentioning

confidence: 99%

“…For pristine monomer MGF-9 in this temperature range the decrease in relative deformation up to change of the sign is observed. Increasing of the temperature leads to a weakening of the links between individual dense cross-linked polymer grains, increasing of their mobility and gradual reduction of internal stresses in individual grains of polymer chain, which causes a sharp increase in the resistance of polymeric matrix to external load [6,14,16]. The appearance of inorganic component changes the form of high elasticity section of MGF-9 : TEOS composite.…”

Section: Methodsmentioning

confidence: 99%

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The influence of polymeric matrix structure on the kinetic and thermomechanical properties of organic-inorganic composites based on TEOS

Khovanets’¹,

Makido²,

Medvedevskikh³

et al. 2018

Him. Fiz. Tehnol. Poverhni

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A promising trend in modern material science is the development of new composite materials based on organicinorganic systems with unique characteristics that combine the properties of individual components. Hybrid organicinorganic composites based on the system of mono-or dimethacrylate and tetraethoxysilane (TEOS) were synthesized. The influence of the structure of the polymer matrix (2-hydroxyethyl methacrylate (HEMA) or oligoesteracrylate (MGF-9)) and the composition of relates hybrid systems on thermomechanical properties and molecular structure of the resulting composites and kinetics of polymerization till deep conversion has been studied. The synthesis of composites was carried out via the process of simultaneous polymerization of the mixtures of liquid organic and inorganic components, during which the inorganic structure is formed in situ in the polymer matrix. The kinetics of stationary photoinitiated polymerization of monomer-tetraethoxysilane systems in thin films till deep conversion was investigated by laser interferometry. The experimental integral and differential kinetic curves were obtained and kinetic parameters of photoinitiated polymerization of the studied systems were determined. As a result, the dependence of the values of the maximum rate of polymerization, conversion and time of its achievement on the ratio monomer : tetraethoxysilane in the compositions was revealed. The kinetic features of polymerization of mono-and dimethacrylates were described using the concept of microheterogeneity of the process of photoinitiated polymerization till deep conversion. The thermomechanical analysis determined the characteristic temperatures, the values of the thermomechanical structural-molecular parameters of the composites were calculated as well. It was shown that when introducing an inorganic filler into a matrix of monomethacrylate, the linear growth of the thermomechanical stability of the material can be observed depending on the quantity of TEOS, while in the case of dimethacrylate matrix this dependence can be characterized by the presence of an extremum, which is related to the formed composites. It was found that HEMA : TEOS = 95 : 5 vol. % and MGF-9 : TEOS = 90 : 10 vol. % composites have the improved thermomechanical properties.The obtained composites can be perspective for the use as a protective coating, in particular for solar collectors, and a basis for the manufacture of conductive membranes for fuel cells.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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The influence of polymeric matrix structure on the kinetic and thermomechanical properties of organic-inorganic composites based on TEOS

Khovanets’¹,

Makido²,

Medvedevskikh³

et al. 2018

Him. Fiz. Tehnol. Poverhni

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“…The v-phenomena of "Auctuation limitations" can explain a decrease in the scattered light intensity after the maximum in the course of 3 0 polymerization is reached (Volkova et al, 1987). …”

Section: Light Scattering In Gels 417mentioning

confidence: 99%

“…In particular, Ftayleigh-Debye's approximation with the correlation function formalism finds application (see subsection 2.1.2) (Gallacher and Betterheim, 1962;Bueche, 1970;Pokrovski et al, 1976;Volkova et al, 1987).…”

Section: Phase Equilibrium In Crosslinked Polymer + Lmwl Systemmentioning

confidence: 99%

Thermodynamics of Systems Containing Flexible-Chain Polymers

Klenin¹,

Frenkelʹ²

1999

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Methods for Studying Three-Dimensional Free-Radical Polymerization and Cross-Linked Polymers

Korolev

Mogilevich

Three-Dimensional Free-Radical Polymerization

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Chapter 9 will be useful for those who are wishing to master the field of three-dimensional free-radical copolymerization because it contains a general description of applicability of various methods used in analytical and physical chemistry for specific tasks: studying the kinetics and peculiarities of cross-linked polymers formation using the TFRP method.Conventional and widely known methods for high-molecular compound chemistry that are described in detail in scientific publications are inapplicable for threedimensional free-radical polymerization (TFRP) with formation of cross-linked polymers because the reaction medium is strongly structured, starting from small degrees of conversion (from the gel point), and produces polymers are nonfusible and insoluble. Therefore, this chapter gives a brief description of well-proven experimental methods used to study TFRP kinetics and the mechanism as well as the structure and properties of cross-linked polymers.

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Light scatter study of the process of formation of the microheterogeneous structure of network polymers based on oligoester acrylates

Cited by 6 publications

References 7 publications

The influence of polymeric matrix structure on the kinetic and thermomechanical properties of organic-inorganic composites based on TEOS

The influence of polymeric matrix structure on the kinetic and thermomechanical properties of organic-inorganic composites based on TEOS

Thermodynamics of Systems Containing Flexible-Chain Polymers

Methods for Studying Three-Dimensional Free-Radical Polymerization and Cross-Linked Polymers

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