製備交聯式層狀水滑石之奈米纖維於熱穩定性研究

Studies on Thermal Stability of Crosslinked Zn-Co-Al Layered Double Hydroxide Nanofiber

張博學(Po-Hsueh Chang) ； 林鈺翔(Yu-Xiang Lin) ； 朱若瑜(Rou-Yu Jhu) ； 陳邦旭(Pang-Shiu Chen) ； 王國平(Gaw-Pying Wang) ； 彭政雄(Cheng-Hsiung Peng)

《明新學報》 44卷2期 (2021/12) Pp. 185-205

摘要

本研究以共沉澱水熱反應法合成不同金屬之鋅／鈷／鋁層狀雙氫氧化合物（ZnCoAl-LDHs），並利用電紡絲以In-Situ方式將其上述ZnCoAl-LDHs成功製備奈米複合金屬纖維材料。本實驗主要分為兩部分，首先以不同莫爾比例之硝酸鋅、硝酸鋁、硝酸鈷經由共沉澱水熱法，調控其不同反應溫度與時間進行合成ZnCoAl-LDHs粉末。第二步驟為，取ZnAl-LDHs與ZnCoAl-LDHs粉末以不同重量比例摻入聚乙烯醇再以不同時間進行混摻反應後，進行靜電紡絲製程。為探討ZnAl-LDHs與ZnCoAl-LDHs之奈米粉末與纖維結構之差異性，故本研究利用X光繞射儀鑑定晶體結構；以傅立葉轉換紅外光譜儀分析材料特性；使用掃描式電子顯微鏡觀察粉末與奈米纖維表面形態。最後藉由熱重分析儀驗證不同ZnAl-LDHs與ZnCoAl-LDHs之金屬種類與莫爾比例對於熱穩定的影響。然而，經由SEM觀察得知以靜電紡絲製備之ZnAl-LDHs以及ZnCoAl-LDHs，其形態呈現支狀纖維結構；由此結果研判LDHs均勻分散之高分子溶劑中並透過電紡絲使之均勻分散纖維結構中，藉此強化結構之穩定性並提升熱性質。

關鍵字

共沉澱法 ； 聚乙烯醇 ； 靜電紡絲 ； 混摻反應 ； 鋅鈷鋁層狀雙氫氧化合物

並列摘要

In this study, Zn/Co/Al Layered Double Hydroxides of different metals using the co-precipitation hydrothermal reaction method and ZnCoAl-LDHs nanofiber synthesized by in-situ electrospinning. This experiment is mainly divided into two parts. Firstly, ZnCoAl-LDHs powder was synthesized using the co-precipitation hydrothermal method with zinc nitrate, aluminum nitrate, and cobalt nitrate in different molar ratios with the reaction temperature and time were controlled. In the second step, ZnAl-LDHs and ZnCoAl-LDHs powders were mixed with polyvinyl alcohol in different weight ratios and then mixed at various times to carry out the electrospinning process. The X-ray diffraction (XRD) was used to identify the crystal structures to investigate the differences between ZnCoal-LDHs and ZnAl LDHs nanopowders and fiber structures. The material properties were analyzed by fourier transform infrared (FTIR) spectrometer. The surface morphology of powder and nanofiber was observed by scanning electron microscope (SEM). Finally, the influence of different ZnAl-LDHs and ZnCoAl-LDHs metal types and molar ratio on thermal stability was verified by the thermogravimetric analyzer (TGA). However, the morphology of ZnAl-LDHs and ZnCoAl-LDHs prepared by electrospinning showed branching fiber structure by SEM observation. The results show that LDHs can be uniformly dispersed in polymer-solvent and dispersed into fiber structures by electrospinning to strengthen the stability and improve the thermal properties.

並列關鍵字

Co-precipitation ； Polyvinyl alcohol ； Electrospinning ； Blending reaction ； Zn-Co-Al Layered Double Hydroxides

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