Local vitrification in the course of the formation of the microheterogeneous structure of a network polymer based on dimethacrylate triethylene glycol

Semyannikov, V.A.; Prokhorov, A.L.; Golikov, I.V.; Byel'govskii, I.M.; Kastorskii, L.P.

doi:10.1016/0032-3950(89)90007-5

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…This can be explained by physical structuring of polymeric system with small concentration of filler (2.5 vol % of TEOS). According to the microheterogeneous concept of radical polymerization polymer MGF-9 is characterized by granular structure in which polymer grains are connected with each other by hydrogen bonds or separate monomer molecules into a single network structure [9][10][11]. This structure is characterized by certain defect of structure.…”

Section: Resultsmentioning

confidence: 99%

Thermal Stability of Organic-Inorganic Composites Based on Dimethacrylate-Tetraethoxysilane System

Khovanets’¹,

Makido²,

Кочубей³

et al. 2017

ChChT

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Abstract. 1 The influence of composition of hybrid organic-inorganic composites based on oligoesteracrylate (MGF-9)−tetraethoxysilane (TEOS) system on their thermal properties and molecular structure was investigated. Thermograms and curves of thermal destruction of samples were obtained, from which temperature ranges, weight loss of samples and thermal effects of each stage were defined. It is shown that introducing an inorganic filler into polymer matrix promotes increasing of thermal stability of the material. Values of characteristic parameters of studied organicmineral composites were calculated as the result of thermomechanical analysis of obtained curves. The composite MGF-9:TEOS = 90:10 (vol %) was found to have the maximal thermal resistance and improved thermomechanical properties.

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Section: Resultsmentioning

confidence: 99%

Thermal Stability of Organic-Inorganic Composites Based on Dimethacrylate-Tetraethoxysilane System

Khovanets’¹,

Makido²,

Кочубей³

et al. 2017

ChChT

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“…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%

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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Local vitrification in the course of the formation of the microheterogeneous structure of a network polymer based on dimethacrylate triethylene glycol

Cited by 2 publications

References 10 publications

Thermal Stability of Organic-Inorganic Composites Based on Dimethacrylate-Tetraethoxysilane System

Thermal Stability of Organic-Inorganic Composites Based on Dimethacrylate-Tetraethoxysilane System

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

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