| LAI Jun,WENG Can,WANG Fei,YANG Dong-jiao.Design and Injection Molding of Superhydrophobic Micro-structured Surface[J],47(11):34-40 |
| Design and Injection Molding of Superhydrophobic Micro-structured Surface |
| Received:June 13, 2018 Revised:November 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.11.005 |
| KeyWord:superhydrophobic wettability micro- structure polypropylene injection molding thermodynamic analysis |
| Author | Institution |
| LAI Jun |
School of Mechanical and Electrical Engineering, Central South University, Changsha , China |
| WENG Can |
School of Mechanical and Electrical Engineering, Central South University, Changsha , China |
| WANG Fei |
School of Mechanical and Electrical Engineering, Central South University, Changsha , China |
| YANG Dong-jiao |
School of Mechanical and Electrical Engineering, Central South University, Changsha , China |
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| Abstract: |
| The work aims to design, three micro-structure arrays with different aspect ratios from the functional design of super-hydrophobic surface and explore their hydrophobicities under different wetting contact states. Firstly, the thermodynamic analysis method was adopted to establish the functional relationships among the system free energy, contact angle and geometrical parameters of three micro-structures with different aspect ratios and investigate the wettability of selef-designed microstructure surface. Then, the polyprophylene micro-structured surfaces were fabricated by combining the UV photolithography, electroforming and injection molding technologies on the basis of thermodynamic analysis. Finally, the wettability was further measured and analyzed. The static contact angles of three designed surfaces were larger than 150?. The rolling angles were re-spectively 12?, 14? and 15? and basically achieved the design goal. The measured contact angles of the function-oriented designed microstructured surfaces agreed well with the theoretical values. The contact angle hysteresis of three surfaces was 15?, 21? and 22?, respectively. The contact angle hysteresis increased as the aspect ratio increased, and the liquidity of the droplets on the PP surface also deteriorated. In the process of designing the superhydrophobic surface of the microstructure, the aspect ratio of the microstructure can be appropriately reduced to obtain better superhydrophobic properties. The self-designed microstructure surface basically realizes superhydrophobicity, which provides theoretical basis and technical support for the functional design and efficient preparation of superhydrophobic polymer surfaces. |
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