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유영은(Y.-E. Yoo),이관희(K.H. Lee),윤재성(J.S. Yoon),최두선(D.-S. Choi),김선경(S.K. Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Hydrophobic plastic plates employing nano surface features are injection molded using thermoplastic materials. A variotherm molding process is devised for filling the nano pores and releasing the molded nano features from the master. The size of the molded nano surface features are about 100㎚ in diameter and 200㎚ in height. The size of the molded plate is about 30㎜ × 30㎜ and the thickness is 1㎜. As molding materials, Polypropylene, PMMA, COC and PC are employed, which are all typical co㎜odity thermoplastic materials. The mold temperature(stamper temperature) is investigated as a major processing parameter for molding high aspect ratio nano surface features. Almost fully molded nano features are fabricated above a certain level of mold temperature depends on the employing material. The contact angles on the injection molded plates are measured to estimate the hydrophobicity and found to have higher contact angle up to 180% compared to the blank plate with no surface features