The Micro Hot Embossing Of Polymber And The Fabrication Of Polymer Hierarchical Micro/Nano Structures

Hot embossing molding has the advantages of low cost, simple operation, small internal stress, and has been widely used in scientific research and production.Micro mould is an important tool to carry out the polymer hot embossing, and the The topology structure is also an important part of polymer molding.It can effectively reduce costs, improve efficiency to carry out for polymer micro heat pressing molding and micro mold structure of polymer micro pressure shaping.In this paper, the formation and the properties of the polymer in different topologies are analyzed, which was combined with the National Natural Science Foundation of China(No.11372286)The established constitutive model of polymer material, use a combination of experimental and simulation methods, the research hot embossing mold topological structure of polymer flow front morphology and formation height effect. The hierarchical micro/nano structures can be enhanced through spinning and electrospinning combined for micro pressure molding technology development preparation issued.The specific contents are as follows:The viscoelastic characteristics of polymer in the process of deformation are discussed by means of rheological mechanism, which provides a theoretical basis for the subsequent hot press molding.In order to get more accurate simulation results, this paper establish the model parameters for the PMMA polymer and different research different temperature strain rate curve model changes through uniaxial compression experiment, and the temperature equivalent principle and the molecular chain motion characteristic curve of the detailed explanation. Based on the rigid finite element method by the software DEFORM-3D to simulate the polymer hot embossing molding process, the equivalent should stress and strain nephogram analysis found in the polymer in the forming process of polymer micro cylindrical part of the equivalent should stress and strain in a little, one of the biggest stress and strain is mainly concentrated in thein the corner of the substrate and the cavity structure contact. A new method to determine the friction coefficient of micro hot pressing die was put forward in combination with experiment and simulation. Then carry out the different die structure and cavity size and accounted for empty ratio of polymer micro pressure molding effects research and testing results.By the polymer composite in micron scale important forming method of hot embossing and nano scale forming an important method of electrostatic spinning was prepared with polymer hierarchical micro/nano structures of spinning film and wettability study. The results showed that the prepared by this method of hierarchical micro/nano structures has good hydrophobic.