The Research Of Manufacture For Polymer Microstructure By Ultrasonic Embossing Technology

This paper mainly focus on issues of the uncomprehensive ultrasonic embossing technology,high cost and difficulties for the mold manufacture.Therefore,we researched the ultrasonic embossing technology by using metal molds to replicate microstructures on Polyethylene Terephthalate(PET)films.The results of this research studied the ultrasonic embossing technology and its application of wettability and microfluidic chips.This paper combined the mechanical engineering disciplines,material disciplines,and biological disciplines.By researching these subjects together,it promotes the development of this new field and inter-discipline.This new method also provides the possibility to the mass manufacture of polymer micro-device.The method of research in this paper bases on the scientific experiments to put theory into practice.The first thing was the research about mechanism of laser processing technology and ultrasonic embossing technology.Then the metal molds were fabricated by using the laser processing technology.Aluminum(6061)was adopted to be mold material because of its better machinability and the optimized laser processing parameters were laser power of 10 W,scanning numbers of 20 times and scanning speed of 500 mm/s respectively.These metal moulds with square patterns were used for the following ultrasonic embossing process.Then we also studied the effects of the ultrasonic embossing parameters on replication quality,especially for replication depth.In order to further optimize the ultrasonic parameters to reach the highest replication depth and rate,the three levels of orthogonal experiments were taken.The results showed that optimized ultrasonic parameters were determined to be ultrasonic pressure of 400 kPa,welding time of 1s and holding time of 4s.What's more,the corresponding maximal depth and replication rate on PET(Polyethylene Terephthalate)can reach 271.7 ?m and 99.74% respectively.In addition,this paper studied the functional polymer surface wettability by combining the laser processing technology and ultrasonic embossed technology.It mainly divided into three parts,including the characterization of surface morphology,measurement and discussion of the contact angles,and chemical composition analysis.The results showed that the surface wettability of processed polymer films achieved the transition from hydrophilic to hydrophobic,and we thought it mainly due to the increase of surface roughness and the change of chemical composition.Finally,microfluidic chips was manufactured successfully by using the same processing method and we discussed applications of this method in the microfluidic field.