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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Title:	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
Authors:	鄭博元;Cheng,Po-Yuan
Contributors:	化學工程與材料工程學系
Keywords:	氧化鋯;聚二甲基矽氧烷
Date:	2014-10-27
Issue Date:	2014-11-24 15:18:43 (UTC+8)
Publisher:	國立中央大學
Abstract:	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。 ;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.
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] Electronic Thesis & Dissertation

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