研究以不同視徑比的鋰鋁層狀雙氫氧化合物應用於環氧基材之製備與性質

Study on the Preparation and Characterization of Li-Al LDHs with Different Aspect Ratio and Epoxy/Li-Al LDHs Nanocomposites

陳韋志(WEI-CHIH CHEN)

指導教授 ： 蔡宗燕

中原大學/理學院/化學研究所/碩士(2008年)

https://doi.org/10.6840/cycu200900655

摘要

本實驗將未改質與有機化改質之層狀雙氫氧化合物(LDHs)混摻於環氧樹脂基材(Epoxy)中藉由原位聚合的方式促使環氧單體在層間進行交聯反應進而成功製備Epoxy/LDHs奈米複合材料。本研究目的在於改變長晶時間的長短，合成出不同粒徑大小的Li-Al LDHs，再經由改質劑sulphanilic acid sodium salt hydrate(SAS)將Li-Al LDHs無機層材表面有機官能化製備出改質型Li-Al LDHs-SAS，於是進一步藉由掃描式電子顯微鏡(SEM)、雷射粒徑儀和穿透式電子顯微鏡(TEM)等儀器分別觀察LDHs改質前和改質後其主層狀結構型態上的變化；從中可以發現Li-Al LDHs隨著長晶時間的增加其粒徑有隨之增大的趨勢，但經有機化改質後其粒徑會由於改質環境的影響明顯降低許多，針對此現象本實驗將未改質和改質後之Li-Al人工無機層材製備成複材進一步探討其在熱性質和難燃特性上的行為表現。於是藉由熱重分析儀(TGA)、動態機械分析儀(DMA)和氧氣指數(LOI)的測試結果得知Li-Al LDH24/Epoxy複材其在熱性質和難燃特性上都有較好的熱穩定性和絕佳的阻隔效應，這主要是由於此複材其主層狀結構具有高視徑比的優點，因此在抑制高分子擾動和提升對高分子基材的包覆能力有相當大的影響。

關鍵字

鋰鋁層狀雙氫氧化合物

並列摘要

Epoxy/Layered double hydroxides nanocomposites have been successfully prepared by using both pristine and modified layered double hydroxide with epoxy resin through in-situ cross-linking polymerization method. Pristine Li-Al LDHs are synthesized by hydrothermal process in different reaction conditions by varying the aging time for 1 and 24 hours. Both the Li-Al layered double hydroxides (abbreviated as Li-Al LDH1 and Li-Al LDH24 for aging time 1 hour and 24 hours, respectively) were modified by using sulphanilic acid sodium salt hydrate (SAS), modified agent to form modified Li-Al LDH1-SAS and Li-Al LDH24-SAS. The morphology of the pristine layered double hydroxides are investigated by using wide angle X-rays diffraction (WAXD), scanning electron microscopy (SEM) and particle size analyzer which indicates that the crystallinity and aspect ratio is increased with increasing the aging time from 1 hour to 24 hours. The particle size of Li-Al LDH24 and Li-Al LDH1 are found to be ~1000 nm and ~250 nm, respectively. Both the pristine and modified LDHs are characterized by XRD, FTIR spectra and thermogravimetric analysis (TGA). Epoxy/Li-Al LDH nanocomposites were characterized by WAXD and transmission electron microscopy (TEM) indicating the sea type intercalation of layered materials dispersed in the polymer matrices. The thermal and mechanical properties were characterized by TGA and dynamic mechanical analysis (DMA). Their combustion behavior has been evaluated by using limiting oxygen index (LOI) test. The properties of Epoxy/Li-Al LDH24 nanocomposites exhibit the better thermal,
mechanical and flame retardant properties than that of Epoxy/Li-Al LDH1 nanocomposites even that of Epoxy/ Li-Al LDH24-SAS nanocomposites.

並列關鍵字

Li-Al LDHs

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