Study On The Effect Of Carbon Nanotubes And Barium Titanate On The Structure And Dielectric Properties Of Nylon/Polyvinylidene Fluoride Blends

In recent years,with the development of electrical electronics and new semiconductor technologies,dielectric composite materials with high dielectric constants have played an increasingly important role in diversified electronic devices.How to increase the dielectric constant while reducing the filler content of the dielectric composite is the focus and difficulty of current research.Based on the perspective of thermodynamics and dynamics,developing research ideas from the aspects of structural regulation,multiple filler selection,mechanism research,model construction,this subject design and prepare a series of PA-based?PA/PVDF,PA/EVA-GMA?composites.The effects of dielectric enhancement of PA-based blends were studied by changing the matrix blending ratio,directionally dispersed fillers,ionic liquid copolymers to control the phase interface structure,directional migration fillers,and doped multiple types of fillers.At the same time,the influence on the aggregation structure and phase structure evolution of PA-based composites was studied,the role and mechanism between phase interface structure regulation and synergistic enhancement of dielectric properties in the blended composite system were analyzed.The co-continuous PA/PVDF/MWCNTs composites with high conductivity and low percolation threshold were prepared by adjusting the structure?blending ratio?.The study found that when the blending ratio is changed,the two-phase phase morphology transformed from the"sea-island"structure to the co-continuous structure and then to the"sea-island"structure.MWCNTs are dispersed in the PVDF phase according to the kinetic process,this study can achieve the selective dispersion of conductive fillers;In order to further reduce the percolation threshold of conductive filler,on the basis of this research and the previous research of the research group,According to the thermodynamic process,P[MAA-BA-?VEIm?Br]ionic liquid copolymers?PILs?are introduced into the PA/PVDF/MWCNTs composite system to precisely control the dispersion of MWCNTs at the interface of blends,thereby preparing double percolation polymer-based conductive composite material,the study found that the electrical conductivity of PA/PVDF/MWCNTs/PILs composites is higher than that of PA/PVDF/MWCNTs composites.and PILs can crosslink and compatibilize the interface of PA/PVDF to further enhance the stability of the phase structure.In addition,in order to prepare polymer-based composite materials with high dielectric properties,doping different types of fillers?conductive filler MWCNTs and ceramic particals Ba Ti O₃?into the PA/EVA-GMA blend,the study found that MWCNTs that are easily agglomerated can be well dispersed in the composite system,and on the basis of maintaining good mechanical properties of the composite system,different types of fillers can synergistically enhance the dielectric properties of the composite material,and in-depth study the mechanism between high dielectric properties and architecture is studied.Showing that the research of phase structure control and doping with multiple fillers can strengthen the interfacial compatibilization and synergistically enhance the dielectric behavior.In summary,this subject has realized the research on the mechanism of enhanced capacity enhancement and regulation of the interface and the synergistic dielectric enhancement of the PA-based composite.the expected research results were obtained,which provided the basis for the follow-up research.