博碩士論文 101324025 詳細資訊




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姓名 鄭博元(Po-Yuan Cheng)  查詢紙本館藏   畢業系所 化學工程與材料工程學系
論文名稱 接枝PDMS之奈米氧化鋯及其與矽膠複合膜之光學性質
(PDMS grafted zirconia nanoparticle and its silicone composites for optical application)
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摘要(中) 本研究製備大小約為6nm之奈米氧化鋯結晶粉體,表面以葵酸進行接枝,再以不同分子量之silanol-terminated Poly(dimethyl siloxane) (PDMS)進行雙重接枝。經改質後所得之粉體能分散至大部分的非極性溶劑中。之後以熱重分析和液態磁核共振進行分析,透過計算,可估算兩種不同改質劑在奈米氧化鋯的接枝量。
經過葵酸與兩種不同分子量PDMS接枝之奈米粉體,其密度分別為2.49 g/cm3和2.34 g/cm3,粉體折射率為1.70和1.66。分散在甲苯中配成50wt%之溶膠後,在可見光波長600nm穿透度分別為11%和46%,配成60wt%則會分層。
然後我們成功製備氧化鋯/矽膠奈米複合材料並塗佈於玻璃基材上,其中接枝葵酸與44K分子量 PDMS之粉體,可與OE-6630矽膠均勻混合成製作成固含量為20wt% 膜厚為20m的複合材料膜,在可見光波長600nm下,具有約95%全穿透率和85%霧度值。
摘要(英) In this study, cubic ZrO2 nanoparticles (~6 nm) were first prepared by the hot-alkaline digestion of zirconium carbonate. The particle surface was then capped by decanoic acid and further grafted with silanol-terminated poly(dimethyl siloxane) (PDMS) to make it dispersible in non-polar solvent. The ligand density on the nanoparticle was calculated with the help of H1-NMR and TGA analysis.
Two PDMS, with molecular weights of 18K and 44K respectively, were employed. The zirconia grafted with 18K PDMS lead to powder filler (ZD-18K) with an Archimedes density of 2.49 g/cm3 and a refractive index of 1.70. The numbers were 2.34 g/cm3 and 1.66, respectively, for that grafted with 44K PDMS (ZD-44K). Both types of filler could be dispersed in toluene at high loading. At a loading of 50 wt%, the dispersion containing the ZD-44K filler showed a spectral transmittance of 46 % (1 cm optical length @600nm). The one prepared with ZD-18K was less transparent, but still give a transmittance of 11%. Nevertheless, phase separation occurs for both systems when the loading increased to 60wt%.
These PDMS grafted fillers were then combined with a commercial silicone (OE-6630) to prepare nanocomposites which was coated on glass substrate for optical studies. A 20 m film could be prepared with the composite containing 20 wt% ZD-44K. It showed a total transmittance of ~95 % and a haze value of ~85% at a wavelength of 600nm.
關鍵字(中) ★ 氧化鋯
★ 聚二甲基矽氧烷
關鍵字(英)
論文目次 摘要 VI
Abstract VII
List of Figures X
List of Tables XII
Chapter1 Introduction 1
1-1 Background 1
1-2 Objectives 4
Chapter2 PDMS grafted ZrO2 nanoparticles 5
2-1 Chemical 5
2-2 Prepare of zirconia fillers and its surface modification 5
2-2-1 Preparation of zirconia nanocrystal 5
2-2-2 Capping with decanoic acid 6
2-2-3 PDMS surface modification 7
2-2-4 Instrument 8
2-3 Chemical structure of the modified zirconia surface 9
Chapter3 Filler properties and compatibility test 19
3-1 Filler property 19
3-1-1 Instruments 19
3-1-2 Powder density measurement 19
3-1-3 The dispersion of the modified zirconia 20
3-2 Compatibility with commercial silicone resins 28
3-2-1 Experiment 28
Chapter4 Characteristics of the composite 30
4-1 Introduction 30
4-2 Experiment 31
4-2-1 Prepare silicone composite 31
4-2-2 Instrument 31
4-3 Thermal stability 32
4-4 The transmittance and Haze value of composite 32
Chapter5 Conclusion 39
Reference 40
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指導教授 蔣孝澈 審核日期 2014-10-27
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