奈米二氧化矽粒子/高分子混成材料之合成及其性質研究

The nanoscale colloidal silica/polymer hybrids:preparation and properties

吳彥興(Yen-Hsing Wu)

指導教授 ： 劉英麟

中原大學/工學院/化學工程研究所/碩士(2008年)

https://doi.org/10.6840/cycu200900216

摘要

本論文主要是奈米二氧化矽粒子的表面改質，以及應用方面的研究。利用奈米二氧化矽粒子上的矽烷醇基，與4-Isocyanato-4’ (3,3-dimethyl-2,4-dioxo-azetidino) diphenylmethane (MIA)上的isocyanate所具有的高反應性，成功將二氧化矽表面化學官能基化，命名為SIA30。以SIA30為起始，成功將末端為胺官能基的高分子接枝到二氧化矽粒子表面，成為以二氧化矽粒子為核心，向外發散線性高分子或高分子刷的星狀高分子。若是以具有多胺基的高分子和SIA30反應，則可以形成核(二氧化矽)-殼(高分子)結構粒子。
所形成的核(二氧化矽)-殼(高分子)結構粒子在表面交聯後，以氫氟酸蝕掉核心的二氧化矽，即可形成奈米中空球。在反應前後，不但可由FTIR、1H NMR、EDX和XPS來鑑定其結構，由粒徑大小的增長，熱重分析和元素分析的結果，也能互相佐證。此外，利用SEM、TEM可觀察到明顯的Core-shell結構，以及氫氟酸處理所形成的奈米中空球。
另一方面，所形成的星狀高分子之ㄧSIA-PGMA，利用PGMA上環氧基的高反應性，可接枝上許多螢光染色劑，進而探討其發光特性，發現將螢光染色劑接枝到二氧化矽粒子表面，可提升其發光強度，並且在波長為365nm光照射下，發現有紫白色光的放射現象。
此外，將改質後的二氧化矽粒子SIA30，利用其與脂肪族的胺類的極佳反應性，直接與幾丁聚醣混合，結果證明，除了良好的相容性之外，機械及熱性質提升，成功改良膜材的應用性。

關鍵字

奈米粒子 ； 二氧化矽

並列摘要

The subject of this study is to develop a novel approach to modify the surface of silica nanoparticles and to prepare silica/polymer nanohybrids. Silica modification was employed with 4-Isocyanato-4’ (3,3-dimethyl-2,4-dioxo-azetidino)diphenylmethane (MIA) through the reaction between the hydroxyl groups of silica nanoparticles and the isocyanate group of MIA. The MIA modified silica nanoparticles (SIA) were then utilized in preparation of silica nanoparticle-cored star polymers and silica nanoparticle/POSS nanohybrids. The chemical structures of the prepared materials were characterized with FTIR, H NMR, wide-angle X-ray diffractometer, and thermal analysis. In addition, core-shell silica nanoparticle/chitosan and silica nanoparticle/ poly(glycidylmethacrylate) (PGMA) nanocomposites were also prepared using SIA as a template. The silica cores of the corer-shell nanocomposites were removed out with hydrofluoride to result in chitosan and PGMA hollow nanospheres. The core-shell and hollow nanosphere morphologies were clearly observed with SEM and TEM. Moreover, core-shell fluorescence silica particles were also obtained. The fluorescence silica particles emit white light under a excitation at 365 nm.

並列關鍵字

Silica ； nanoparticle

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