Preparation And Properties Of High Performance Polyarylene Ether Nitrile-based Dielectric Composites

As the research on polymer-based functional composites becomes more and more thorough,aerospace,electronic appliances,microelectronics and other industries have increasingly higher requirements on the comprehensive performance of materials.In addition to the basic characteristics of light weight and high mechanical strength,it also requires good thermal stability and excellent dielectric properties.In this paper,high performance polyarylene nitrile was used as the polymer matrix,copper calcium titanate and graphene oxide were used as functional fillers to prepare polyarylene ether nitrile based dielectric composite materials by continuous ultrasonic dispersion technology combined and solution casting film formation method.Its structure and performance were studied.Firstly,the surface hydroxylation of copper calcium titanate with hydrogen peroxide was used to prepare a polyarylethernitrile/copper calcium titanate composite material.The results of FTIR found that the treated copper calcium titanate showed a significant hydroxyl peak at 3439 cm^-1.The tensile strength and breaking elongation of the composite decreased with the increase of the mass fraction of copper calcium titanate,but it was still at a relatively high level.The glass transition temperature of the composite materials was higher than 170?,T_5%was more than 500?,and T_maxax was maintained at about 530?.With the increase of mass fraction of copper calcium titanate?0 wt%to 60 wt%?,the dielectric permittivity of the composite increased from 2.86 to 6.31,and the loss tangent was less than 0.03.Secondly,as a conductive filler,graphene oxide was introduced to prepare polyarylene ether nitrile/graphene oxide composite material.The experiment found that the dielectric permittivity of the composite material increased obviously with the increase of graphene oxide content,but the loss tangent also gradually increased.When the graphene oxide content was 3.0 wt%,the composite material had percolation phenomenon,and the loss tangent was as high as 0.81.Although the mechanical properties decreased,the downward trend was not obvious.When the mass fraction of graphene oxide was 2.5 wt%,the tensile strength was 77 MPa and the breaking elongation was 4.0%.In addition,the glass transition temperature of the composite material was around 172?,T_5%was higher than 500?,and T_maxax was slightly changed around 540?.Finally,the treated copper calcium titanate and graphene oxide were introduced into polyarylene ether nitrile together to prepare a polyarylene ether nitrile/copper calcium titanate/graphene oxide ternary composite material.It was found that the loss tangent remained low in the case of increased of the dielectric permittivity of the composite material.When the content of copper calcium titanate and graphene oxide were 30 wt%and 2.5 wt%respectively,the loss tangent was only 0.024.Although the strength dropped to 62 MPa,it was still comparable to the ordinary engineering plastics.The composites exhibited the good thermal stability with glass transition temperatures above 170?,T_5%around 495?,and T_maxax above 526?.All of The films prepared from the composite materials had good flexibility and could be rolled and wound in multiple layers.In summary,the polyarylene ether nitrile/copper calcium titanate/graphene oxide ternary composite material retained the good mechanical properties and high thermal stability of the polyarylene ether nitrile.It also incorporated the excellent dielectric properties of the filler and had good applications.