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標題: | 氣囊輔助AAO無縫金屬滾輪直接熱壓製作奈米結構研發 Development of a Gasbag-Roller-Assisted Hot Embossing Process with Seamless Anodic Aluminum Oxide Roller to Fabricate Nanostructures on the Polymeric Films |
作者: | Chia-Fong Lu 呂嘉峰 |
指導教授: | 楊申語 |
關鍵字: | 熱滾壓,陽極氧化鋁,氣囊滾輪,抗反射,疏水性, Anodic aluminum oxide,hot roller embossing,gasbag roller,anti-reflection,hydrophobic, |
出版年 : | 2012 |
學位: | 碩士 |
摘要: | 具奈米結構之高分子薄膜廣泛應用於抗反射及自潔等,其複製量產方式包括平板熱壓及熱滾壓,相對省時、省能、連續而且大面積製程。熱滾壓目前有幾個困難待克服:第一,滾輪滾壓時,容易因剛性滾輪加工精度不佳或表面不平整,使滾壓壓力不均勻,且剛性滾輪進行熱壓時,與基材為線接觸;第二,於滾輪上直接製作奈米結構。多仰賴電子束、離子束或是微影蝕刻等加工方式,成本高、製程繁瑣且加工時間長。本研究將利用陽極氧化鋁製程技術於管狀鋁材上製作出具奈米結構模具,並利用氣體等向均壓之特性,開發氣囊滾輪輔助熱滾壓機台,連續熱滾壓陽極氧化鋁結構於基材PMMA上。
滾輪模具部分是使用純度為99.7+%鋁管材作為陽極進行陽極氧化製程,直接在管材上製作陽極氧化鋁(AAO)奈米孔洞結構。因材料純度不夠,生成之陽極氧化鋁結構具有微米級及奈米複合結構。本研究組合氣囊滾輪組件、加壓組件、模具滾輪組件、加熱滾輪組件及驅動組件組合,接著設計出一台氣囊滾輪輔助熱滾壓機台。其中氣囊滾輪是先以切削製作鋁合金啞鈴狀滾輪,外層包覆一具有撓性、高延展性且耐高溫的矽膠材料,形成密閉腔體。 經感壓軟片實驗證實氣囊滾輪相較於剛性滾輪有效增加滾輪與基材間之接觸長度與壓力的均勻性。在適當的滾壓參數配合下,可成功地複製陽極氧化鋁模具結構於基材PMMA上。此外,進行連續大面積滾壓成型,滾壓之前段與末端由SEM圖觀測,皆成功複製出模具上微奈米複合結構。 本研究進一步使用純度為99.999%之鋁片,將其彎捲成管狀後進行陽極處理,因鋁材純度較高、雜質含量低,在試片上製作出50mm ×50mm整齊排列無微米級孔洞結構。並使用氣囊滾輪輔助熱滾壓機台複製其結構於基材PMMA上。 最後,PMMA經過兩種不同模具熱滾壓複製結構在其表面。在接觸角方面,由75.9o提升至117.5o。而抗反射的部分,反射率可由約為6%降至0.2%。 關鍵字:熱滾壓、陽極氧化鋁、氣囊滾輪、抗反射、疏水性。 Nanostructured films have been widely applied for anti-reflective components and self-cleaning functions. Roller embossing is a continuous and efficient productive process for fabrication of nanostructures on polymeric films. There are two common problems: First, producing roller for replicating nanostructure on films mostly relies on the process such as e-beam or focused ion beam. These processes are expensive, complicated and time-consuming. Secondly, the pressure is non-uniform and the contact between the rigid roller and the substrates is almost a line. To solve these problems, this study employs anodic aluminum oxide (AAO) to produce seamless roller with anodic aluminum oxide nanostructures. At the same time, this study develops a gasbag–roller-assisted hot roller embossing process. Nano-pillars structures can be continuously fabricated on PMMA surface by the gasbag-roller-assisted hot roller embossing facility AAO roller is made from alumina tubes with purities of 99.7%. A facility, which consists of AAO roller, gasbag-roller, pressuring roller, heating component and driving component, is designed and implemented. Nano-pillars structures can be continuously fabricated on PMMA surface by the gasbag-roller-assisted hot roller embossing facility. With aid of pressure sensitive films, it is observed that gasbag-roller not only increases contact area between roller and substrate but also enhances the uniformity of pressure. Hybrid micro/nano structures on the PMMA have been fabricated with AAO roller mold made from alumina with 99.7% purity, while much more periodic nano-pillars have been fabricated with alumina with 99.999% purity. Finally, the hydrophobic and anti-reflective characteristic of PMMA with nanostructures have been verified. The contact angle of PMMA with nanostructures is 119.5o while the contact angle of a bare PMMA is 75.9o. Nanostructures on the PMMA also decrease reflective rate from 6% with bare PMMA to 0.2%.This study demonstrates an efficient and low-cost method for fabrication of nano-pillars on polymeric films for hydrophobic and anti-reflective function. Keyword:Anodic aluminum oxide、hot roller embossing、 gasbag roller、 anti-reflection、hydrophobic |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65486 |
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顯示於系所單位: | 機械工程學系 |
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