水熱螯合法製備奈米氫氧化鎂及其性質研究

Preparation and Characterization of Magnesium Hydroxide Nanoparticles Using Combination of Hydrothermal and Chelating Techniques

蕭篤信(Tu-Hsin Hsiao)

指導教授 ： 蘇昭瑾

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2007年)

摘要

氫氧化鎂是一種較環保無毒性且具有良好阻燃效果的難燃劑，奈米級氫氧化鎂被預期具有較高且均勻的掺混性質，故可達到較佳的阻燃效果及較低的掺混比例之需求，可降低對原掺混聚合物物性的影響及提高經濟效益。本實驗是以水熱法(hydrothermal method)來製備奈米級氫氧化鎂，使用鎂粉作為起始物，添加ethylenediamine (EN)、diethylenetriamine (DETA)、1,4,8,11-tertaazacyclotetradecane(TATD)等不同螯合劑來限制及控制氫氧化鎂的成長，並且用不同的反應物比例及水熱條件調節並操控所得奈米級氫氧化鎂的形狀及大小，最後經由化學分析能譜儀(ESCA)辨其化學組態、X射線繞射儀(XRD)測量晶格結構分佈、穿透式電子顯微鏡(TEM)觀察氫氧化鎂的顆粒形貌及大小、熱重分析儀(TGA)來得知熱裂解溫度及重量損失狀況。實驗結果可得片狀和針狀且具有良好結晶特性的奈米級氫氧化鎂，並發現氫氧化鎂結晶顆粒的外型，及出現針狀和片狀結晶的比例，與螯合劑種類及與反應中不同的水合劑量有明顯的相關性。

關鍵字

奈米氫氧化鎂 ； 水熱法 ； 難燃劑

並列摘要

Magnesium hydroxide (Mg(OH)2), due to its smoke-suppressing capability, shows a green environment and excellent performance as an flame-retardant additive. It decomposes endothermically to release water of hydration and magnesium oxide, which contribute to the flame-retarding action. It is found that the form of magnesium hydroxide particles, in particular, the shape, size and agglomeration level influence the overall mechanism for flame-retarding. Other factors, like surface modification and the mixing procedure also affect localized heating during the burning process. The purpose of this thesis is to prepare magnesium hydroxide nanoparticles and also to investigate how to influence the particle size, shape and its agglomeration, during and after synthesis of nano-scaled magnesium hydroxide. Three chelating compounds : ethylenediamine (en), diethylenetriamine (DETA), and 1,4,8,11-tertaazacyclo tetradecane(TATD) are applied in controlling the morphology as well as the particle size of such-prepared magnesium hydroxide. The chemical state was identified by electron spectroscopy for chemical analysis (ESCA), the crystal structure of the product was examined by X-ray diffraction (XRD), the particle dimension and morphology were examined by transmission electron microscopy (TEM), the thermal decomposition temperature was determined by thermogravimetric analysis (TGA).

並列關鍵字

magnesium hydroxide ； hydrothermal method ； nanoparticles ； flame retardant

參考文獻

5. M . Celina and G. A.George, Polymer Degradation and Stability. 48, 297 (1995).

9. Asomoza, B. a. A. M. J. State Chemistry. 115, 411 (1995).

10. Portillo, R. Langmuir. 12, 40 (1996).

12. T. Lopez, I. G., R. Gomez, J. Catal. 127, 75 (1991).

13. S. Iijima, Nature. 354, 56 (1991).