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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林江珍 | |
dc.contributor.author | Yu-Ting Tsai | en |
dc.contributor.author | 蔡育庭 | zh_TW |
dc.date.accessioned | 2021-06-16T02:49:42Z | - |
dc.date.available | 2020-10-12 | |
dc.date.copyright | 2015-10-12 | |
dc.date.issued | 2015 | |
dc.date.submitted | 2015-07-15 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/54308 | - |
dc.description.abstract | 為解決業界白光二極體 (white light-emitting diode, WLEDs) 於環氧樹脂封裝過程中,螢光粉易沉降之現象為主要研究。本實驗設計一新型有機改質黏土,藉由高分子型有機胺鹽與奈米黏土進行離子交換所得之,其可均勻分散於酸酐型環氧樹脂中。有機改質黏土於樹脂中屬於非牛頓流體具有剪切稀力之特性,可作為新型流變助劑與增稠劑,其能有效避免螢光粉於樹脂加熱固化過程中沉降,成功克服高密度無機顆粒材料於高分子材料中不易分散且易沈澱之問題。系統於高剪切力低黏度 (約250 cP) 下,螢光粉能夠均勻分散於樹脂中,幫助螢光粉均勻分散於樹脂中,扮演分散劑之角色;然當樹脂靜置後,系統則瞬間回至高黏度 (約1,500 cP),有效避免螢光粉之沉降現象發生。
合成之有機改質黏土經 X-光散射 (X-ray Diffraction, XRD) 鑑定後,黏土層間距由原始之 12 Å 達 52 Å,證實高分子型有機胺鹽與鈉離子交換進入黏土層間,得到一插層型有機改質黏土;利用流變儀則可分析有機改質黏土於樹脂中之流體性質與黏度變化,最後利用掃描式電子顯微鏡 (Scanning Electron Microscope, SEM) 觀察螢光粉於封裝樹脂中之分散情形。 | zh_TW |
dc.description.abstract | We discovered a new class of polyetheramine-modified organoclays enabling the homogenously dispersing inorganic phosphorescent phosphor powder (Y3Al5O12; yttrium aluminum garnet; YAG) in the epoxy encapsulation of light-emitting diode (LED) devices. The organoclays were prepared from the ionic exchange reaction of sodium montmorillonite (Na+-MMT) with alkyl-amines (C12, C14 and C18 fatty amine) and various polyether-amines including poly(oxypropylene) (POP) and poly(oxyethylene) (POE) diamines, and characterized by using X-ray diffraction (XRD). The organoclays were screened for the function of dispersing YAG in the two-component epoxy system involving an anhydride curing agent and an aliphatic resin. The organoclays from the POP-diamines intercalation, MMT-POP2000, at the basal spacing structure of 52 Å (in reference to 12 Å for Na+-MMT), was found to be effective for homogenizing YAG in the epoxy. With the addition of 1.0 wt% of MMT-POP2000, the viscosity of the epoxy system was increased up to 1,500 cP at standing but decreased to 250 cP under high shear force, indicating a strong non-Newtonian shear-thinning behavior. As a result, the micrometer size of YAG particles (13 ~ 14 μm) was well distributed in the epoxies without aggregation during the curing process owing to the high viscosity. The behavior of organoclays as the thickening agent was investigated and applied to the fabrication of white LED illumination by emitting blue light then mixing yellow light of YAG particles. Furthermore, the homogeneous dispersion of YAG particles in cured epoxy was confirmed by scanning electron microscope (SEM). | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T02:49:42Z (GMT). No. of bitstreams: 1 ntu-104-R02549007-1.pdf: 5405237 bytes, checksum: 44ba1d3bafddeda746385618041ff720 (MD5) Previous issue date: 2015 | en |
dc.description.tableofcontents | Acknowledgements………………………………………………………………I
中文摘要 ………………………………………………………………...............II Abstract ……………………………………………………………..................IV Contents ………………..……………………………………........................VI Figure captions …………………………………………………………........... VIII Table captions ………………………………………………………............... XI Chapter 1 Introduction and Literature Review…….........................................................1 1.1 Introduction of Light-emitting Diodes………………………….....1 1.1.1 Background…….………………………….……...…….1 1.1.2 White light-emitting diodes (WLEDs)…………………3 1.1.4 Epoxy encapsulation….……..…….…………….……..4 1.2 Introduction of Nanocomposites………...………………………...6 1.2.1 Background……………………………………………....6 1.2.2 Polymer/layered Silicate Nanocomposites……………....9 1.2.3 Sodium Montmorillonite (Na+-MMT)………………….10 1.2.4 Intercalation of Layered Structures with Organics……..12 1.2.5 Polymer/layered Silicate Nanocomposites……………..13 1.3 Rheology Modifying Agent……………………………………...14 1.3.1 Background...……………………………….…….…. . .14 1.3.2 Newtonian and non-Newtonian………………………...15 Chapter 2 Experimental Section……………………………17 2.1 Materials……………………………………………17 2.2 Intercalation of Na+-MMT by Amine-salts……………………… 20 2.3 Rheological Properties of MMT-POP2000 in Different Medium.22 2.4 Dispersing YAG in the Presence of MMT-POP2000 in Epoxies..23 2.5 2.5 Transparence of MMT-POP2000 in Epoxy Composites……24 2.6 Film Formation of Dispersing YAG by Organoclays in Epoxies and Light-Emitting Test…..………………………………………......25 2.7 Characterization and Measurements……………………………..26 Chapter 3 Results and Discussion…………………………………........................... .27 3.1 Preparation of Intercalated Silicate Clays and d-spacing Analysis………………………………………………………….27 3.1.1 Synthesis of Organoclays……………………………....27 3.1.2 XRD Analysis of Organoclays………………………....29 3.2 Curing Reaction of Anhydride/Epoxy Resins…………………...31 3.3 Rheological Properties of MMT-POP2000 Organoclays in Resins…………………………………………………………....33 3.3.1 MMT-POP2000 in Anhydride/EpoxyResin as non-Newtonian Fluid………………………………………..33 3.3.2 Different Amount of MMT-POP2000 to Anhydride/Epoxy Resin……………………………………………………35 3.3.3 MMT-POP2000 in only Anhydride or Anhydride/Epoxy resin at Different Temperature………………………….36 3.3.4 Two Factors on MMT-POP2000 to Enhance the Resin Viscosity………………………………………………..39 3.4 The Homogeneity of YAG Particles in the Anhydride/Epoxy Resin …………………………………………………………….40 3.4.1 Dispersing YAG Particles by MMT-POP2000 in the Resin……………………………………………………40 3.4.2 Mechanism of Dispersible YAG Particles in the Anhydride/Epoxy Resin………………………………..43 3.4.3 The Homogeneity Analysis of YAG Particles in the Anhydride/Epoxy Resin………………………………..45 3.5 Transparence of the Anhydride/Epoxy Cured Resins with MMT-POP2000…………………………………………………………46 3.6 Film Formation of Dispersing YAG by MMT-POP2000 in Resins……………………………………………………………48 Chapter 4 Conclusion………………………………………………………………………….49 Chapter 5 Table of Content…………………………………………………...…50 References………………………………………………………………....…..51 | |
dc.language.iso | en | |
dc.title | 有機改質黏土應用於螢光粉分散劑及封裝流變助劑 | zh_TW |
dc.title | Organically Modified Clays as Dispersing Agents and Rheology Modifying Agents for Facilitating Epoxy Encapsulation of LED Lights | en |
dc.type | Thesis | |
dc.date.schoolyear | 103-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 謝國煌,童世煌,王逸萍,張信貞 | |
dc.subject.keyword | 有機黏土,螢光粉,分散劑,流變助劑,發光二極體, | zh_TW |
dc.subject.keyword | organoclays,phosphorescent phosphor powder (Y3Al5O12,Yttrium Aluminum Garnet,YAG),dispersant,rheology modifying agents,light-emitting diode (LED), | en |
dc.relation.page | 55 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2015-07-15 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 高分子科學與工程學研究所 | zh_TW |
顯示於系所單位: | 高分子科學與工程學研究所 |
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