Synthesis Of Amide Acid Emulsion And Its Study On Surface Modification Of Glass Fiber

The interface between the glass fiber(GF)and the resin plays an important role in improving the properties of the composite.Amide acid emulsion(SP-1)was synthesized and polyvinylpyrrolidone(PVP)was added for compounding(SP-2).The particle size distribution,stability and heat resistance properties of the emulsion were characterized by a nanoparticle size analyzer,a full-function stability analyzer,TG,and TEM.SEM and optical microscopy were used to investigate the surface morphology and diameter of glass fibers at different emulsion types,concentrations,and temperatures,and the monofilament tensile properties of the fibers were tested.The micro-debonding method was used to study the interfacial bonding between GF and PPS and epoxy resin,and IFSS at different emulsion concentrations and temperatures and wet heat treatment was tested,and the debonding interface and cross-section of the composite material were observed by SEM.The results showed that:when BTDA:ODA = 1.2:1,emulsion particle size distribution,particle groups are negatively charged and had a core-shell structure,and the stability is better.The membrane component is rich in the characteristic absorption peak of the imide,making it possess good heat resistance.The film layer has a good coating on the fibers.When the solids content of the emulsion is 0.4%,the compounded emulsion coating amount is 1.184%,the average coating thickness is 0.15 μm,and the tensile strength is increased from 1.439 GPa to 1.448.GPa.As the temperature rises,the chemical bonding between the film and the GF surface are stronger,and the GF tensile strength increases.Emulsion coating promotes mechanical staking and compatibility between GF and resin,and has good moist-heat stability.The treated GF and PPS and the IFSS of the epoxy resin were greatly improved;The interfacial bonding performance of GF and epoxy resin decreased as the pretreatment temperature increasing.