The Theoretical Modeling Of Spatial Confining Forced Network Assembly Method For Preparation Of Electric Conductive Polymeric Composite Materials

At present,polymer composites are widely used in various industries.The unique properties of composites disseminated them in engineering,optics,construction,and other industries.Electrical properties of composites formed the basis for numerous devices used in electrical and electronics.Conductive polymer composite materials find their application in innovative technologies,such as thin chemical and biological sensors,solar cells,flexible electronic appliances,printed circuit boards,various resistors,and actuators.The development and implementation of high technologies in the production of modern materials necessitate the development of new competitive composites,superior to known analogs in performance,environmental performance,safety,and energy efficiency.Features of resistive materials cause the use of their modifications for structures of bulk and film types.Carbon-containing components are widely used to ensure the stability of electrical properties.The main reason for the increase of programs of scientific research and development in the field of composite materials is a real possibility of replacing other construction materials.This dissertation describes the theoretical and practical study of a new SCFNA method of preparation of polymer composite(PC)materials with high characteristics of electrical conductivity based on carbon filler.In the first Chapter of this work,a literature review of references devoted to the topic of the current dissertation was conducted.Analysis of existing studies helped in the selection of the materials most often used as matrices and fillers in the manufacture of conducting PCs(CPCs).The rationale for choosing PP and PDMS as thermoplastic and thermosetting matrices,respectively,carbon fiber and graphene as micro-and nanofiller,respectively,were given.In the second part,a literary review of the existing methods of mixing CPCs components was given;qualitative analysis of their applicability was given.A literature review of existing mathematical models describing the conductive characteristics of heterogeneous systems was proposed.Some possible advantages and disadvantages of each type of models were demonstrated;the limitations of the models were shown.Many arguments are suggesting the need to develop a new model describing the features of the new SCFNA method were presented.Chapter 2 was devoted to the study the fundamentals of Spatial Confining Forced Network Assembly for CPCs.A theoretical model of the SCFNA method was proposed.The advantage of the developed approach in the field of organization of compact conducting clusters and reducing the specific volume resistance of the materials obtained by this method is shown.In the third experimental part,the results of the experiments conducted with the aim of obtaining test samples of conducting PCs were stated.As a result of 5 series of experiments were collected:(1)samples based on PP with carbon fiber,(2)samples based on PDMS with carbon fiber,(3)samples based on PDMS with carbon fiber and bolting cloth,(4)samples based on PDMS with graphene nanoplatelets,(5)samples based on PDMS with carbon fiber and graphene nanoplatelets.For determining the effectiveness of the developed SCFNA method,each series of experiments as accompanied by a comparison of the traditional compounding method and the developed SCFNA method.The fourth part of the current work presents a formulating a mathematical issue describing the conductive characteristics of the material obtained by the developed SCFNA method.Analysis and comparison of experimental results and existing mathematical models showed that the established method requires a new way to the numerical modeling of the conductivity process.In this chapter,assumptions aimed at simplifying mathematical calculations and taking into account the main parameters of the preparation of CPC were developed.As characteristic describing the effect of the methcxi SCFNA to complete the force assembly of conductive networks following the theoretical description of this method,the coefficient of compression ratio was used.Due to this coefficient,the possibility of predicting the electrophysical properties of CPCs depending on the characteristics of the material processing is shown.The analysis of the efficiency of the model was carried out from the comparison of theoretical and experimental data.The proposed model showed a high degree of agreement with experimental data,demonstrated the ability to accurately predict the electrical behavior of the developed materials obtained by the SCFNA method.Deviations from the experimental data may be due to the summation of non-critical errors of the components and parameters of the model,statistic errors during the experiments,as well as statistical error.