Effect of vibration in processes of structure formation in polymers

Studentsov, V. N.; Pyataev, I. V.

doi:10.1134/s1070427214030173

Cited by 17 publications

(6 citation statements)

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“…The physical methods of modification in order to improve the mechanical properties of products made of non-metallic materials, among them PCM, include the use of exposure to a microwave electromagnetic field, which makes it possible to form a set of properties specified by technical conditions in the volume of a material based on thermal and non-thermal effects [11][12][13][14][15]. Most of the successful examples of the practical application of microwave action on dielectric materials relate to the preliminary modification of the initial components and an increase in the efficiency of the stage of matrix curing during the formation of PCM.…”

Section: Problem Statementmentioning

confidence: 99%

Change of Rigidity of PCM Modified in an Ultrahigh Frequencies Electromagnetic Field under the Action of External Factors

Злобина

2021

MSF

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Experimental studies of bending deformation of carbon - and fiberglass samples after 8-month exposure in full-scale conditions were performed and the modulus of transverse elasticity was determined. It was found that the influence of the external environment on fiberglass samples is more significant. For carbon fiber, there was an average decrease of 7.1%, and for fiberglass-by 14%. Modification of samples in ultrahigh frequencies (UHF) electromagnetic field reduces the negative influence of the environment: the values of the transverse elastic modulus of carbon fiber and fiberglass samples are reduced by 5% and 11%, respectively. It is shown that the UHF electromagnetic field in rational modes can increase the modulus of transverse elasticity of carbon fiber by (27-30)%, fiberglass – by (20.8-25.6)% with a significant increase in the uniformity of this parameter. Experimental studies of the bending deformation of carbon-and fiberglass specimens after 8-month exposure in natural conditions have been carried out, and the shear elastic modulus has been determined. It has been established that the influence of the external environment on fiberglass samples is more significant. For carbon fiber reinforced plastic, a decrease was noted on average by 7.1%, for fiberglass - by 14%. Modification of samples in a microwave electromagnetic field helps to reduce the negative influence of the external environment: the values of the shear modulus of the prototypes of carbon fiber reinforced plastic and fiberglass are reduced by 5% and 11%, respectively. It is shown that the microwave electromagnetic field in rational modes allows increasing the transverse elastic modulus of carbon fiber reinforced plastic by (27-30)%, fiberglass - by (20.8-25.6)% with a significant increase in the uniformity of this parameter.

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Section: Problem Statementmentioning

confidence: 99%

Change of Rigidity of PCM Modified in an Ultrahigh Frequencies Electromagnetic Field under the Action of External Factors

Злобина

2021

MSF

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“…This causes the need for additional strengthening of the structure in some dangerous areas, which leads to an increase in weight [6]. Therefore, various technological methods are more promising, for example, physical modification [7]. An analysis of studies performed in Russia and abroad shows that one of the promising areas for the physical modification of PCM products is finishing in a microwave electromagnetic field [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Reducing Defectiveness of the Interphase Layer in Polymer Composite Materials after Exposure to a Microwave Electromagnetic Field

2023

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The microstructure in the area of the interfacial layer (IFL) of structural carbon and glass-reinforced plastics after exposure to a microwave electromagnetic field in the cured state has been studied. It was found that the IFL of control and experimental samples is characterized by the presence of structural formations of complex shape with granular morphology, the element sizes of which are 10-20 nm. The IFL of control samples is characterized by increased defectiveness, expressed in numerous microcracks of 100-500 nm in size and more, and matrix delaminations from the fiber up to several hundred nanometers in size. In experimental samples, such defects are practically not detected. In the modes of microwave exposure, corresponding to the temperature of the temporary restoration of the plasticity of the matrix, the formation of waviness is noted. The research results allow us to conclude that one of the reasons for the increase in the physical and mechanical properties of cured polymer composite materials as a result of microwave exposure is a significant reduction in defectiveness in the IFL.

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“…In order to impart new functional properties to the material, various electrophysical processing methods, such as elastic vibrations of the ultrasonic frequency range, high and ultrahigh frequency currents, corona electric arc, infrared processing and others, are widely used (Figure 1) [17][18][19][20]. One of the methods of electrophysical modification is treatment with high frequency currents.…”

Section: Introductionmentioning

confidence: 99%

Microwave Modification of an Epoxy Basalt-Filled Oligomer to Improve the Functional Properties of a Composite Based on It

et al. 2023

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The purpose of this work is to study the influence of the electric field strength of an electromagnetic wave with the maximum modifying effect on an epoxy basalt-filled oligomer, which is of great scientific and practical importance for the development of microwave oligomer modification technology. The optimal modes of microwave modification, under which the highest values of the mechanical properties of an epoxy basalt-filled polymer composite material are obtained, are identified: power of 400 W and an exposure time of 24 s. At the same time, the breaking stress in bending increases by 20%, the impact strength increases by 2 times, and hardness increases by 31%. A slight increase of 4.5% in heat resistance is noted compared to the composite obtained on the basis of an oligomer unmodified in the microwave electromagnetic field. The results of resistance to various aggressive environments are obtained, which show that the studied physical and mechanical characteristics of the epoxy basalt-filled material after exposure to an aggressive environment decrease by less than 14%, which corresponds to their good resistance to an aggressive environment. It is established that the effect of the microwave electromagnetic field on an epoxy basalt-filled oligomer is an effective modification method that improves physical and mechanical characteristics with a high level of temporal stability to climatic influences, with a coefficient of property retention of more than 90%.

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Effect of vibration in processes of structure formation in polymers

Cited by 17 publications

References 0 publications

Change of Rigidity of PCM Modified in an Ultrahigh Frequencies Electromagnetic Field under the Action of External Factors

Change of Rigidity of PCM Modified in an Ultrahigh Frequencies Electromagnetic Field under the Action of External Factors

Reducing Defectiveness of the Interphase Layer in Polymer Composite Materials after Exposure to a Microwave Electromagnetic Field

Microwave Modification of an Epoxy Basalt-Filled Oligomer to Improve the Functional Properties of a Composite Based on It

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