Preparation And Properties Of Polyphenylene Sulfide Based Composites

Polyphenylene sulfide is a semi-crystalline thermoplastic resin with a phenylsulfide group in the molecular main chain.It has excellent comprehensive properties,including high dimensional stability,high temperature resistance,corrosion resistance,UV aging resistance,flame retardance,and excellent Mechanical properties and excellent insulation properties,therefore,it is known as the sixth largest special engineering plastic.Polyphenylene sulfide is widely used as a polymer material due to its special structure.The unstretched polyphenylene sulfide prepared in the laboratory has a crystallinity of about 5 to 10%,which is amorphous,and the exothermic peak of the crystal is about 100 °C,the glass transition temperature is 130 to 140 °C,and the resin has a high degree of polymerization The melting point is about 280 ?.By compounding other materials and changing its performance,various functional films,high temperature resistant anticorrosive coatings and insulating plates are made,which are used as electronic components,aerospace coatings or aircraft bodies,automobile parts,etc.However,the PPS synthesized by advanced technology of China still has the problems of low production capacity and expensive production cost.Although it occupies a low price in high temperature resistant materials,it is much higher than general engineering plastics.Pure polyphenylene sulfide has brittle performance and unstable medium viscosity due to its rigid phenyl sulfide structure.Therefore,the applications of PPS on the market today are mostly modified alloys or their composite materials,mainly fiber-reinforced PPS,inorganic metal nanoparticles or organic small molecule-filled PPS,different special engineering plastics blended with PPS,etc.Therefore,how to prepare PPS composite materials with specific morphology and performance without affecting the performance of PPS is the top priority of current research and development.Based on the above analysis,this thesis takes PPS as the main body of research,synthesizes PPS through mature preparation methods,explores the synthesis of materials with different morphologies and different properties under different conditions,and then composites with functional materials,and according to The properties of the composite materials are expected to be tested.The main researchcontents of this article are as follows:1.Preparation of polyphenylene sulfide through improved sodium sulfide method,selecting different catalysts,additives and experimental conditions.The experiment proves that when the experimental conditions of catalyst,auxiliary agent,raw material dehydration rate and so on are different,the morphology of the prepared PPS is very different.When using the same modified sodium sulfide method to prepare PPS,the experiment uses commonly used p-dichlorobenzene,sodium sulfide,lithium chloride,and sodium hydroxide as raw materials,and the PPS obtained by changing different ratios has a lamellar structure And the sheet-like self-assembled bouquet-like structure.This is due to the fact that PPS itself is arranged alternately with benzene-sulfide bonds,?-? superposition of benzene rings and polymerization caused by van der Waals force,forming a lamellar structure.Increasing the theoretical specific surface area of the polymer can load more materials.The thinnest layer of this material synthesized under specific synthesis conditions is 10 nm,and the structure is uniform and the dispersion is good.In addition,the flower-shaped PPS can be prepared by changing the type of catalyst to produce a 3D network structure with a large specific surface area and more bearing space,which can be used to prepare catalytic or adsorption materials.In the next experiment,by synthesizing the high-viscosity material and PPS into a composite material,the brittleness of the material is further improved,and the application range of the material is widened.2.A series of palygorskite and PPS composite materials are prepared by a simple one-pot method.Palygorskite was chosen because of its own good colloidal properties and excellent heat resistance properties.After compounding with PPS,the performance of a single material has been improved.Experiments show that after PPS and palygorskite are prepared by one-pot method,a new shape of palygorskite is produced.Moreover,this kind of material has lower thermal weight loss and higher flame retardancy in the heat-resistant reaction.At the same time,the adsorbability of palygorskite was also used to prepare a recyclable adsorption membrane.Experiments show that the addition of PPS significantly changes the high viscosity of palygorskite in membrane preparation,and the resulting product can form a uniform film on filter paper,which has excellent adsorption performance in high pressure and normal pressure.3.Two kinds of graphene quantum dot PPS composite materials were prepared by different synthesis methods.During the experiment,the flexibility and high activity ofgraphene greatly improved the bending strength and heat resistance of the synthesized composite materials.The obtained product also has antibacterial self-cleaning performance,and has excellent protection performance in the air and in bad weather.