The Preparation And Research Of Aramid Fiber Reinforcing Polyphenylene Oxide/Nylon 6 Alloy

Aramid fiber 1414 as reinforcing material can improve the mechanical properties,friction performance,the thermodynamic performance and thermal stability of thermoplastics.In this paper,the aramid fiber had been selected to prepare fiber reinforcing polyphenylene oxide composite materials.But It is very hard for polyphenylene oxide to impregnate the aramid fiber because of high melt viscosity.so this study blended nylon 6 with polyphenylene oxide to reduce the melt viscosity.In addition,it can improve the impact strength of polyphenylene oxide and stress crack resistance ability.But polyphenylene oxide is a kind of non-polar polymers,which is poorly compatible with a high degree of crystallinity of nylon 6.In order to improve the compatibility of polyphenylene oxide and nylon 6,this study had selected SEBS-MAH as compatibilizer.This paper had mainly studied mechanical properties,rheological properties,thermodynamic performance and thermal stability the nylon 6on polyphenylene oxide,and the effects of compatibilizers SEBS-MAH on polyphenylene oxide/nylon 6 alloy by mechanical properties and thermodynamic properties,thermal stability and compatibility.In the last,the aramid fiber reinforced polyphenylene oxide/nylon 6 composites had been prepared by melt blending to study the influence of the aramid fiber content on mechanical properties,friction properties,thermodynamic properties,thermal stability and impregnation effect of composite materials.By torque rheometer and high temperature TG – DSC,this study had found that different PA6 content had great influence on the properties of PPO.Along with the increase of PA6,the melt viscosity and thermal stability of PPO decreased.Through the SEBS-MAH compatibilizing PPO/PA6 alloy,mechanical performance results showed that tensile,Flexural,impact strength were 68.25 MPa,101.89 MPa and 69.96 KJ/m2 when adding 10 portions SEBS-MAH,which increased by 19.1%,19.1% and 49.3% compared with alloy without compatibilizer.With more compatibilizers,the glass transition temperature of the alloy also gradually increased,but melting temperature basically remained unchanged.By the DMA test,the results showed that alloy of the energy storage modulus increased with the increase of compatibilizers.From SEM test,the compatibility of alloy is very poor without SEBS– MAH.PA6 dispersed in PPO with size of 1 um to 20 um particles,which presented typical sea island structure.When adding 10 portion of SEBS – MAH to alloy,twophase interface of PPO and PA6 obviously changed,from the sea island structure into a continuous structure,with few PA6 in particle form.SEBS-MAH has greatly improved the compatibility of PPO and PA6.The elements relative content of N,O,C had been tested By XPS.Treated by oxygen plasma,the relative contents of oxygen on the surface of aramid fiber increased from 16.15% to 20.78%,nitrogen increased from 9.8% to 11.13%,and carbon decreased from 74.04% to 68.09%.Fiber reinforced composites had been prepared,the results showed that mechanics and friction performance is the best when the content of aramid fiber was 10 portions,and the tensile,flexural and impact strength respectively increased by 22.1%,13.1% and 13.1% compared with no aramid fiber.DMA test showed that loss tangent peak didn't move and widths remained the same with different amount of aramid fiber,which mean that the addition of AF has no effect on Tg of alloy.But the increased storage modulus with more aramid fiber showed rigidity of composite materials increased.From the notched impact section microstructure figure of composites with different content of aramid fiber modified by oxygen plasma,the aramid fiber had been well impregnated by the matrix when the aramid fiber content is no more than7.5 portions.After the stress rupture,the matrix and fiber all fractured,still with resin adhered on the fiber surface.