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研究生： 蕭奕安
Yi-An Hsiao
論文名稱： 延伸操作對PETG光擴散膜物性影響效應之研究
The influence of drawing process on optical performance of PETG film
指導教授： 邱顯堂
Hsien-Tang Chiu
口試委員: 吳昌謀
Chang-Mou Wu
邱智瑋
Chih-Wei Chiu
游進陽
Chin-Yang Yu
邱顯堂
Hsien-Tang Chiu
學位類別： 碩士
Master
系所名稱： 工程學院 - 材料科學與工程系
Department of Materials Science and Engineering
論文出版年： 2018
畢業學年度： 106
語文別： 中文
論文頁數： 103
中文關鍵詞： 光擴散膜 、押出 、白化 、應力誘導結晶 、縱向延伸
外文關鍵詞： optical diffusion film, extrusion, whiten, stress induced crystallization, machine direction orientation
相關次數： 點閱：153  下載：1 
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    • 在這項研究中，為了使薄膜能達到更高的透光度與易於加工等優異性，使用PET系中的PETG為研究對象。實驗中以PETG(Poly(ethylene terephthalate)-glycol)為基材，PMMA(Poly(methylmethacrylate)粉末為光擴散劑，透過押出機製造薄膜和縱向延伸機(MDO)延伸後，針對薄膜相同濃度下，不同延伸工藝的光擴散膜作比較。
    使用UV光照射後觀察薄膜光老化的改變，霧度計(Haze meter)測量薄膜光學性質，萬能試驗機紀錄薄膜之拉伸等一系列之研究，探討MD方向延伸與押出機押出薄膜之差異，研究薄膜經MD方向延伸後白化的現象，熱性質的表現，與物性的差異，並透過掃描電子顯微鏡(SEM)，觀察斷面的變化，並藉由水氣穿透率(WVTR)實驗檢測薄膜的阻隔性能。
    其結果證明，在PMMA在濃度為5%的情況下，未延伸膜(UDF)與一次延伸膜(DT)均具有高穿透高霧度的光擴散膜，又以UDF50um與DT100 um為最接近完美的配向性;在延伸MD方向過程成中出現薄膜白化及增韌效果，其原因為兩不相容物質之間產生破孔使介面光散射增加與應力誘導結晶，導致薄膜出現均勻白化現象，受應力誘導結晶之薄膜阻水性提高。

    The emphasis of this study lies in the benefits of PETG,a series of PET of poly(ethylene glycol-co-1,4-cyclohexanedimethanol terephthalate) (PETG) copolyesters with different molar ratios of ethylene glycol (EG) to 1,4-cyclohexanedimethanol (CHDM),which equipped transparency and ease of producing films In the experiment, PETG was used as a substrate, and PMMA (Poly(methylmethacrylate) powder was a light diffusion agent. These films were produced by an extruder ,then stretched by machine direction orientation (MDO). We compared to light diffusion films with different elongation at the same recipe. The color flex can be used for measuring material aging testing after that we used haze meter to measure the optical properties of the film, and recorded the changes in film stretching by tensile strength tests in this experiment. We discussed between the extension of the MDO and the extrusion film of the extruder .We found the process of changing transparency to opaque during the film drawing by MDO. According to the phenomena, we also tested the films thermal behavior, physical properties and the cross-section morphology displayed voiding by Scanning Electron Microscope(SEM) .To compare the water barrier properties of films ,we used water vapor transmission rate test(WVTR) to detect. The results of the experiment indicated that PMMA at a concentration of 5% , unoriented (UDF) and oriented (DT) films which were produced by extrusion were high transmittance and high haze properties as a result UDF50 um and DT100um were the closest to perfect alignment. Because of films whitening occurs in the extended MD direction, to sum up the reasons which holes are formed between two incompatible materials, which increases the interface light scattering and stress-induced crystallization, resulting in uniform whitening of the film and toughening effect, meanwhile, the films which were crystallized by MDO equipped water barrier properties.

    目錄 摘要 I Abstract II 致謝 III 目錄 IV 圖目錄 VIII 表目錄 XI 第一章 序論 1 1-1 前言 1 1-2 研究背景與動機 2 第二章 文獻回顧 8 2-1 光學膜之高分子選定 8 2-2 光擴散膜 8 2-3 聚對苯二甲酸乙二酯 10 2-3-1 聚對苯二甲酸乙二醇酯-1，4環己烷二甲醇酯 13 2-4 擴散劑 14 2-4-1 壓克力[52] 14 2-4-2 光學擴散粉 18 2-5 光學擴散膜原理 19 2-6 液晶顯示器(Liquid-Crystal Display , LCD) 20 2-7 背光模組零組件介紹 22 2-8 有機電激發光二極體(OLED) 24 2-9 Mini LED & Micro LED[55] 26 2-10 塑料薄膜成型方法 27 2-10-1 押出成型 27 2-10-2 溶液流延成型 28 2-10-3 押延成型 28 2-10-4 乾式複合 28 2-11 MDOPF 縱向延伸膜 28 2-12 取向非晶態聚對苯二甲酸乙二酯膜的結晶[59, 60] 29 第三章 實驗 30 3-1 實驗材料 30 3-2 實驗儀器 31 3-3 實驗架構 32 3-4 熱性質分析 34 3-4-1 熱重損失分析儀(TGA) 34 3-4-2 熱示差掃描熱儀(DSC) 35 3-4-3 熔融流動指數測定儀(MFI) 35 3-4-4 微型混煉機(Xplore) 36 3-5 實驗方法 37 3-5-1 薄膜製造 37 3-5-1-1 雙螺桿混煉 37 3-5-1-2 三軸共押 39 3-5-1-3 MD方向延伸機 40 3-5-2 儀器分析 42 3-5-2-1 雷射奈米粒徑電位分析儀 (Zetasizer) 42 3-5-2-2 霧度計(Haze meter) 42 3-5-2-3 萬能試驗機(Universal Tensile Tester) 43 3-5-2-4 掃描式電子顯微鏡(SEM) 44 3-5-2-5 快速耐候試驗機(UV-Condensation) 45 3-5-2-6 色差計(Color Flex) 46 3-5-2-7 水氣透過率(WVTR) 47 3-5-2-8 X光繞射(X-RAY Diffraction) 48 3-5-2-9 可視角(AOV) 48 第四章 結果與討論 50 4-1 原料鑑定 50 4-1-1 熱性質分析 51 4-1-1-1 熱重損失分析儀(TGA) 51 4-1-1-2 差示掃描量熱分析(DSC) 53 4-1-2 流變性質分析 55 4-1-2-1 熔融流動指數測定儀(MFI) 55 4-1-2-2 微型混煉機 56 4-1-3 薄膜製造 57 4-2 薄膜分析 65 4-2-1 光穿透度&霧度 65 4-2-2 可視角 68 4-2-3 黃化指數 69 4-2-4 電子顯微鏡(SEM)結果 70 4-2-5 拉伸試驗(MD) 73 4-2-6 拉伸試驗(TD) 76 4-2-7 變溫下的應力應變圖 78 4-2-8 配向性 79 4-2-9 水氣穿透率 80 4-2-10 XRD 81 第五章 結論 83 第六章 參考文獻 84

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