Functional Materials for Construction Application Based on Classical and Nano Composites: Production and Properties

Kolosov, A. E.; Kolosova, Elena

doi:10.5772/intechopen.73393

Cited by 6 publications

(5 citation statements)

References 51 publications

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“…При отверждении термореактивных смол конкурируют процессы образования золя -это линейный рост цепей и циклизация, и образования геля -ветвление полимерных цепей [2,[17][18][19][20].…”

Section: материалы и методыunclassified

Classification of energy impacts by their effect on the structure and properties of reinforced reactoplasts

Cheremukhina

2021

Vestn. Voronež. gos. univ. inž. tehnol.

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The use of various physical influences is an economical and highly effective direction for regulating and improving the characteristics of the modified reinforced polymer composite materials developed in this work. The methods of energy effects studied in this work were used at the stage of impregnation of technical threads of various chemical nature with an oligomeric binder and a hardener (when preparing prepregs by the traditional method) or with a binder solution and a curing system (when preparing prepregs by the method of layered application of components) Based on the conducted research, a classification of the applied methods of physical modification according to the principle of the influence of energy fields is proposed. The studied methods of energy effects are divided into orienting and energetically energizing effects. The first group includes treatments with constant magnetic (PMP) or electric fields (PEP), and constant mechanical loads. The second group includes energy effects that have a wave nature (energetically energizing), and vibration, ultrasonic effects, and ultraviolet radiation are attributed to them. Modification methods of the first group contribute to a decrease in the mobility of binder molecules during curing, while the formation of branches of polymer chains occurs during the curing process, which leads to a predominant increase in the destructive stress during static bending. Energetically energizing effects contribute to the relative acceleration of the process of linear growth of polymer chains during curing, which is accompanied by the formation of a more sparsely cross-linked mesh structure, which leads to a predominant increase in impact strength. Of the two competing processes in the curing of epoxy oligomers, this one requires a higher activation energy, which is confirmed by the results of studies. Analyzing the results obtained, it can be concluded that the modification methods used in the work allow not only to obtain polymer composite materials with high strength characteristics, but also to directly adjust the properties of composites depending on the requirements for the products. Orienting modification methods lead to hardening of the resulting polymer composite material with a predominant increase in the destructive stress during static bending from 20 to 47%. When using energetically energizing influences in the technology of producing reinforced reactoplasts, the impact strength increases mainly from 19 to 40%.

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Section: материалы и методыunclassified

Classification of energy impacts by their effect on the structure and properties of reinforced reactoplasts

Cheremukhina

2021

Vestn. Voronež. gos. univ. inž. tehnol.

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“…Следует отметить, что связующее в этом случае активизируется лишь при повышенной температуре в условиях отверждения [7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: материалы и методыunclassified

Features of diffusion processes in the preparation of prepregs by the method of layered application of components

Cheremukhina

2021

Vestn. Voronež. gos. univ. inž. tehnol.

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The modern production of products made of composite materials based on thermosetting binders is mainly based on the use of pre – impregnated reinforcing technical threads-prepregs. The binder used for such semi-finished products must meet two important technological requirements: have a low reactivity (high viability) when stored in the temperature range from -5 to +25 ° C and the ability to adjust the curing time at the molding temperatures of the product. To eliminate the disadvantages of the traditional method of obtaining polymer composite materials, to improve their strength characteristics and reduce the cost of the resulting reinforced composites, it is proposed to use the method of layered application of components. The essence of the method consists in layer-by-layer impregnation of the fibrous filler with a binder solution, and then a developed curing system consisting of an amine hardener that prevents the interaction of the hardener with the resin under storage conditions and protective polymer emulsions. The binder-filler system is activated only at an elevated temperature under curing conditions. It is established that the optimal parameters for processing by direct pressing of the pre-pegs components obtained by the method of layer deposition are a pressure of 15 MPa and a temperature of160-170 ?С with a pressure exposure of 15 minutes. If you get products by winding, then for such products, heat treatment for 6 hours at a temperature of 120 ?С is optimal. In the conditions of forming products, that is, at an elevated temperature and at an increased pressure, the mutual diffusion of components occurs due to the movement of oncoming flows. Oligomeric molecules from the resin volume diffuse from the inner layer to the outer one, and the components of the curing system meet them from the outer layer to the inner one. The method of layered application of components makes it possible to create a macroheterogenic system of interpenetrating polymer meshes in the contact area of sequentially applied layers. The result of the research is an increase in the shelf life, the viability of prepregs (up to 10 days) and an improvement in the complex of physical and mechanical properties of composites: the destructive stress during static bending increases to 60 %, during dynamic bending (impact) - up to 50 %. The use of carboxymethylcellulose as a protective polymer provides higher indicators of the studied properties than when using butadiene styrene latex as a protective polymer..

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“…Then the obtained mixture is subjected to US treatment at effective regimes [40]. A wide range of issues concerning with production and properties of functional materials for construction applications based on classical and nano composites are investigated in [41]. And the main attention is paid to US treatment as the dominant method of physical modification in the production of PCMs for functional purpose with predetermined operational properties.…”

Section: Aspects Of Production Technology For Nanomodified Polymer Comentioning

confidence: 99%

Short Review of Studies on Modeling of Technology and Technical Means Used for Production of Classical and Nanomodified Functional Polymer Composite Materials

Kolosov¹,

Kolosova²

2018

IJET

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The paper briefly announces the results of many years of research in the field of modeling and design of parameters of technology and technical means for production of classical and nanomodified functional polymer composite materials for structural purposes. Models of oriented structurally inhomogeneous media are considered which form the basis for designing parameters for technological methods of impregnation and winding, as well as for predicting the stress-strain state of classical polymer composite materials. Ultrasonic treatment is being investigated as a basic method of intensifying technological processes as well as improving the physico-mechanical and operational properties of classical and nanomodified functional polymer composites. The main parameters and features of the ultrasonic treatment modes are described. The results of modeling and designing of manufacturing technology parameters for production thermoplastics are presented. The aspects of the production technology for nanomodified functional polymer composite materials for functional purposes are provided.

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Functional Materials for Construction Application Based on Classical and Nano Composites: Production and Properties

Cited by 6 publications

References 51 publications

Classification of energy impacts by their effect on the structure and properties of reinforced reactoplasts

Classification of energy impacts by their effect on the structure and properties of reinforced reactoplasts

Features of diffusion processes in the preparation of prepregs by the method of layered application of components

Short Review of Studies on Modeling of Technology and Technical Means Used for Production of Classical and Nanomodified Functional Polymer Composite Materials

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