Formation and its Influencing Factors of Polyamic Acid Nano-emulsion

Polyamic acid(PAA) nano-emulsions were formed by adding an amine and a non-solvent of PAA to a solution of PAA in turn.These droplets range in size from 50 to 100 nm supported by light-scattering particle size analyzer and transmission electron microscopy.The results showed that polyamic acid salt was of great importance for the formation of nano-emulsion.Further,the effects of varied amounts of components for polyamic acid,amine,and methonal on the nano-emulsion were investigated.To get a stable nano-emulsion in methanol,the following ratios are required: amine/COOH=0.6～0.7,non-solvent /solvent=1.5～2.25.