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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林唯芳(Wei-Fang Su) | |
dc.contributor.author | Chieh-Ming Tsai | en |
dc.contributor.author | 蔡介銘 | zh_TW |
dc.date.accessioned | 2021-06-16T23:16:29Z | - |
dc.date.available | 2013-08-15 | |
dc.date.copyright | 2012-08-15 | |
dc.date.issued | 2012 | |
dc.date.submitted | 2012-08-01 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65032 | - |
dc.description.abstract | This research is focus on developing solventless transparent high refractive index nanocomposite resins. By blending different surface-modified TiO2 into either bisphenol A diacrylate or 4-vinyl benzyl alcohol containing free radical initiator, two different solventless hybrid resins can be made and further polymerized via radical polymerization into bisphenol A polyacrylate and poly(4-vinylbenzyl alcohol) nanocomposite respectively. They exhibit high refractive index (>1.7) with high transparency.
First, we investigated the chemical structure effect of surface modifier on the chemical and physical properties of nanocomposite. Acetic acid (AA), phenylacetic acid (PAA) and hexanoic acid (HA) were used to modified the surface of TiO2 nanoparticle by in-situ sol-gel synthesis. AA- TiO2 is a well known, stable particle in aqueous solution, but it is difficult to be dispersed in common organic matrixes like epoxy resin and polyacrylate. As a result, Only PAA-TiO2 and HA-TiO2 were used in the polyacrylate system. The PAA-TiO2/polyacrylate nanocomposite has better performance in refractive index (1.70 vs. 1.67), thermal properties (Td: 284.7℃ vs. 277.8℃; Tg: 64.8℃ vs 61.8℃) and mechanical properties (hardness: 19.02 VHN vs. 14.39 VHN) than HA-modified TiO2/polyacrylate nanocomposite due to the stiff aromatic structure of PAA surface modifier. Second, we studied the chemical structure effect of polymers on the chemical and physical properties of nanocomposite. A polymerizable amphiphilic 4-vinyl benzyl alcohol was synthesized to obtain poly(4-vinylbenzyl alcohol) (PBzOH). The PBzOH exhibits higher refractive index than bisphenol A polyacrylate and is compatible with AA-TiO2. At 18 vol% TiO2, the PBzOH-AA-TiO2 nanocomposite has a refractive index of 1.73 and excellent transparency (>85% from 500nm to 800nm). The refractive index of the nanocomposite can be further increased to 1.77 by replacing AA-TiO2 by PAA-TiO2. This solvent free high refractive index hybrid resin can be casted into thick film (>50μm), which has potential application in the LED encapsulation, optical parts and interconnects. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T23:16:29Z (GMT). No. of bitstreams: 1 ntu-101-R99527018-1.pdf: 3532005 bytes, checksum: 23b4f52e28d5cc203fab6c10817c18c1 (MD5) Previous issue date: 2012 | en |
dc.description.tableofcontents | Acknowledgement I
ABSTRACT III 摘要 V CONTENTS VII LIST OF TABLES XI LIST OF FIGURES XII Chapter 1 Introduction 1 1.1 Background 1 1.2 Motivation 2 1.3 Research Direction 2 Chapter 2 Literature Review 4 2.1 Light and Media 4 2.1.1 Transportation of Light 4 2.1.1.1 Refraction of light 4 2.1.1.2 Reflection of light 5 2.1.2 Refractive Index, Extinction Coefficient and Dielectric Constant 7 2.1.3 Refractive Index of Common Materials 9 2.2 TiO2 Nanoparticles and Surface Modification 11 2.2.1 Synthesize TiO2 nanoparticles by Sol-gel Method 11 2.2.2 Surface Modificaton of TiO2 nanoparticles 12 2.2.2.1 Inorganic modification of TiO2 nanoparticles 12 2.2.2.2 Organic modification of TiO2 nanoparticles 13 2.3 Polyacrylate and Polystyrene 15 2.3.1 Polymerization of acrylate 15 2.3.2 Polymerization of styrene 16 2.4 Hybrid Nanocomposite 17 2.4.1 High Refractive Index Nanocomposite 17 2.4.2 Development of High Refractive Index Nanocomposite 18 Chapter 3 Experimental Section 21 3.1 Chemicals and Instruments 21 3.2 Experimental Procedure 23 3.3 Preparation of Acid Surface-modified TiO2 Nanoparticle 25 3.3.1 Synthesis of PAA Surface-modified TiO2 Nanoparticle 25 3.3.2 Synthesis of HA Surface-modified TiO2 Nanoparticle 25 3.4 Fabrication of TiO2/Polyacrylate Film 26 3.4.1 Preparation of Solventless TiO2/acrylate Nanocomposite Resins 26 3.4.2 Fabrication of TiO2/polyacrylate Nanocomposite Film Sample 27 3.5 Preparation of AA-TiO2 Nanoparticle in Aqueous Solution 28 3.6 Synthesis of 4-vinylbenzyl Alcohol 28 3.7 Fabrication of TiO2/Polyvinylbenzyl Alcohol Film 29 3.7.1 Preparation of Solventless TiO2/VBzOH Nanocomposite Resins 29 3.7.2 Fabrication of TiO2/polyVBzOH Nanocomposite Film Sample 30 3.8 Characterization 31 3.8.1 Crystallinity 31 3.8.2 Particle Size and Morphology 31 3.8.3 Chemical Structure 32 3.8.4 Refractive Index 32 3.8.5 Transparency 33 3.8.6 Thermal Properties 33 3.8.7 Mechanical Properties 34 Chapter 4 Results and Discussion 36 4.1 TiO2 Nanoparticles 36 4.1.1 Crystalline Structure 37 4.1.2 Particle Size and Morphology 38 4.1.3 Ratio of Organic Surfactant 40 4.2 Synthesis and Characterization of VBzOH 41 4.3 PAA/HA-TiO2/Polyacrylate Nanocomposite 42 4.3.1 Refractive Index of Nanocomposite 42 4.3.2 Optical Properties of Nanocomposite 44 4.3.3 Morphology of Nanocomposite 47 4.3.4 Thermal Properties of Nanocomposite 50 4.3.4.1 Decomposition temperature of nanocomposite 50 4.3.4.2 Glass transition temperature of nanocomposite 52 4.3.5 Mechanical Properties of Nanocomposite 55 4.4 AA-TiO2/PVBzOH Nanocomposite 57 4.4.1 Refractive Index of Nanocomposite 57 4.4.2 Optical Properties of Nanocomposite 58 4.4.3 Morphology of Nanocomposite 59 4.4.4 Thermal Properties of Nanocomposite 61 4.4.4.1 Decomposition temperature of nanocomposite 61 4.4.4.2 Glass transition temperature of nanocomposite 62 4.4.5 Mechanical Properties of Nanocomposite 63 4.5 Comparison of Different Nanocomposites 65 Chapter 5 Conclusion 72 Chapter 6 Recommendations 74 REFERENCES 75 | |
dc.language.iso | en | |
dc.title | 無溶劑之透明高折射率奈米複合材料 | zh_TW |
dc.title | Solventless Transparent High Refractive Index Nanocomposite Resin | en |
dc.type | Thesis | |
dc.date.schoolyear | 100-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 蔡豐羽(Feng-Yu Tsai),趙基揚(Chi-Yang Chao),王立義(Lee-Yih Wang),邱文英(Wem-Yen Chiu) | |
dc.subject.keyword | 折射率,奈米複合材料,二氧化鈦,無溶劑,透明,高分子,混摻, | zh_TW |
dc.subject.keyword | refractive index,nanocomposite,titanium dioxide,solventless,transparent,polymer,hybrid, | en |
dc.relation.page | 79 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2012-08-01 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
顯示於系所單位: | 材料科學與工程學系 |
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