Study On The Stable Forming Of Polymer Internal Microchannels Based On Thermal-Electric Effect

The microchannel structure with circular cross section inside polymer has excellent properties in fluid,mechanics,biology and other fields,and has been widely used in microelectronics systems,microfluidic equipment,medical detection and other fields.At present,the main processing methods for polymer internal microchannels are hot pressing,injection molding,laser ablation,chemical etching.There are many problems with these methods,such as low surface quality,unstable forming and unstable cross section shape.In view of the above pain points,this paper studies the stability forming of polymer channel structure from theoretical analysis,simulation and experimental research.The phase field theory was used as the simulation model for the evolution of polymer channel molecular diffusion,and then the evolution of polymer channel micronano structure was simulated.Finally,the stable forming of polymer channel under thermo-electrical coupling was studied.A method for selfassembly of polymer internal microchannel structures under thermal-electrical coupling is proposed.The main research results of this paper are as follows:(1)Based on the phase field theory,the mathematical model of polymer channel forming under high temperature was established.The deformation mechanism of polymer microstructure driven by surface energy was studied.Then,the partial differential equation of polymer molecular diffusion and migration under high temperature was constructed,and the theoretical solution of the simulation model was obtained,which provided a theoretical basis for the simulation study of polymer molecular microstructure evolution.(2)Based on the principle of polymer molecular diffusion motion under the action of temperature field,The stable forming method of polymer channel structure was studied from the perspective of energy.Firstly,c language program was used to compile and run the simulation mathematical model to obtain the position data of polymer molecules’ time-related and spatially continuous phase field variables.After the position data was visualized,the forming law of polymer internal microchannels was summarized.The influence of initial surface structure size parameters on polymer channel forming was investigated.The simulation study can provide theoretical guidance for the experimental research on the stable forming of the channel structure in polymer.(3)Based on the simulation study of polymer channel forming process,the experimental study of polymer channel forming was carried out.Based on the micro-groove structures on the polymer surface with different depth to width ratios,the influence of different initial structural parameters on the polymer surface on the inner channel forming was studied,and the forming structure was compared under the action of single temperature field and the thermoelectric coupling field respectively.Through thermal-electrical coupling,single-channel,double-channel and specialshaped(Z-shaped)channel structures with high internal surface quality were self-assembled on the polymer substrate at one time.The final test results were consistent with the simulation results.The method of thermo-electrical coupling controlling the stable forming of the channel structure in polymer proposed in this study can provide a new idea for the research of microchannels in the field of microfluidic chips.