Preparation Of Core/shell PANI Nanoparticles In Microemulsion & QSPR On Prediction Of Cloud Point Of Surfactants

Microemulsion is a isotropic,transparent and thermodynamically stable system consisting of oil,water,surfactant and appropriate cosurfactant.The polymer synthesized in mircoemulsion system has high molecular weight,small particle size distribution,high specific surface area,regular chains and special properties.Of course,these properties are not owned by polymers prepared in ordinary emulsion system.So microemulsion system is a efficient method for preparation of new material.In this paper,the phase diagrams of the pseudo-ternary-component about SDS/Styrene-/n-pentanol/water system is studied.The microemulsion region is found and divided into W/O,bi-continuous and O/W which is helpful to select the polymerization system.Conductive polyaniline as new material of functional polymer makes itself a focus because of its simple synthesis methods,excellent environmental stability and wide application.But it has poor processability because of its rigid structure.In this paper, three problems are discussed.First,Core-shell structure is applied to overcome the defects confining the application of polyaniline.We produce nanoparticles of poly(styrene-co-styrene sulfonate)(PS-PSS)in nitrogen atmosphere by microemulsion system,then the produced PS-PSS particles are used as templates to prepare PAIN-coated core-shelled PANI/PS-PSS nanoparticles under low temperature.It's much easier to coat on PS-PSS particles than PS particles for aniline monomer.Second,increase conductivity by doping with different doptant and different environment.Positive charge is induced on nitrogen atom belonging to molecular chain in order to deduce the resistivity by using different acid and environment.Third,the proper R,the value of the ratio of polystyrene to polyaniline,is studied in this paper.The conductivity of composite material closes to pure polyaniline with the increase of aniline monomer with the destruction of the core-shell structure.So the right R value should be studied for excellent structure and conductivity.The best R value is 2.5[m(St):m(An)].TEM,SEM and FTIR are used to analyze the composite material to research the impaction of the surfactant on distribution of nanoparticles and the different ways on polymer properties in order to find out the best condition for synthesis of PAn/(Ps-Pss) nanoparticles.The polyaniline is used aboard in anticorrosion painting field.In this paper,the steel board is coated with styrene,polyaniline,polymer blend and core-shell structured PAn/(Ps-Pss)in order to research the antisepsis process by protracting open circuit potential varying curve though the potentiostat.The outcome shows the imputrescibility of the compounded PAn/(Ps-Pss)microlatex is the best.The quantitative structure-property relationship(QSPR)is used to predict the cloud point of surfactants.Several structural,electronic,spatial and thermodynamic properties are selected as descriptors to build the relationship between cloud point and the microscopic structures.These descriptors include the octanol/water partition coefficient AlogP,the total energy,the Molecular density,the highest occupied orbital energy EHOMO,dipole-y and the dipole-z.Two methods,the multiple linear regression(MLR) and Partial least squares(PLS)analysis,were chosen to model the structure-properties relationships.The result showed that MLR analysis is better to predict the cloud point of nonionic surfactant than PLS analysis.