以溶液聚合法製備鋰鋁、鎂鋁層狀材料/壓克力樹脂奈米複材及其性質探討

本研究藉有機化改質的鎂鋁、鋰鋁無機層狀雙氫氧化合物(MgAl-LDH、LiAl-LDH)的添加及有機/無機奈米混成效應，製備出壓克力樹脂/無機層狀雙氫氧化合物奈米級複合材料，改善壓克力樹脂材料特性，包括熱穩定性、機械強度(儲存模數)、氣體阻隔效應與紫外光阻抗等。本實驗將不同陰離子交換當量(Anionic Exchange Capacity，AEC)之無機層狀雙氫氧化合物，經由改質劑十二烷基硫酸鈉(SDS)和椰油醯兩性基二丙酸二鈉(K2)，將鎂鋁和鋰鋁層狀雙氫氧化合物無機層材表面有機官能化後製備有機官能化改質型無機層狀雙氫氧化合物，利用X-ray繞射分析儀、紅外線光譜儀(FT-IR)及熱重分析儀(TGA)確認有機改質分子已與無機層狀雙氫氧化合物層間之陰離子置換，再藉由掃描式電子顯微鏡(SEM)、雷射粒徑儀分別觀察無機層狀雙氫氧化合物改質前和改質後其主層狀結構型態上的變化。再者，利用自由基聚合反應中的溶液聚合反應，製備壓克力樹脂/無機層材奈米級複合材料。在複材之檢測上，首先利用X -ray繞射分析儀(XRD)和電子穿透顯微鏡(TEM)了解無機層狀雙氫氧化合物於高分子的分散型態，再利用熱重分析儀(TGA)及示差掃描熱卡計(DSC)探討其奈米複材之熱裂解溫度(Td)及玻璃轉移溫度(Tg)之變化；將壓克力樹脂/無機層狀雙氫氧化合物奈米複材後加工方式製備薄膜，以紫外-可見光分析儀探討此複材薄膜對紫外光的阻抗效果，氣體滲透分析儀(GPA)探討氣體阻隔效應，動態分析儀(DMA)之檢測出其機械強度提升的程度，再以凝膠滲透層析儀測分子量大小。

關鍵字

壓克力樹脂

並列摘要

In this work, PMMA/LDHs nanocomposites were prepared by modifying MgAl、LiAl layered double hydroxides before in-situ polymerization of PMMA. PMMA/LDHs nanocomposites show the enhanced physical, mechanical and chemical properties when compared to pure PMMA. Two types of LDHs with different anionic exchange capacity (AEC) were applied for this study and compared those properties with each other. The LDHs have been modified then using sodium dodecyl sulfate and disodium cocoamphodipropionate by anionic ion exchange reaction. The modified LDHs have been characterized by X-rays diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and thermo-gravimetric analysis (TGA). The morphology of the modified layered double hydroxides are investigated by using scanning electron microscopy (SEM) and particle size analyzer. The PMMA/LDHs nanocomposites were prepared by free radical solution polymerization method. The X-rays diffraction (XRD) and transmission electron microscopy (TEM) techniques were employed to study the morphology of the PMMA/LDHs nanocomposites. The thermal properties were examined by using thermo-gravimetric analysis (TGA) and differential scanning calorimetry (DSC). The optical property was measured by UV-visible spectroscopy which shows that these materials have good optical property. Gas permeability analyzer (GPA) measurements show the excellent gas barrier property of the nanocomposites.Mechanical properties and molecular weight were measured by dynamic mechanical analysis (DMA) and gel permeation chromatography (GPC),respectively.

並列關鍵字

PMMA

參考文獻

2. S. Komarneni, “Nanocomposites”, J. Mater. Chem., 1992, 2(12), 1219-1230.

3. A. K. Dhibar, S. Mallick, T. Rath, B. B. Khatua., “Effect of clay platelet dispersion as affected by the manufacturing techniques on thermal and mechanical properties of PMMA-clay nanocomposites”, Appl. Polym. Sci., 2009, 113, 3012-3018.

4. C. Manzi-Nshuti , P. Songtipya, E. Manias, M. M. Jimenez-Gasco , J. M. Hossenlopp, C. A. Wilkie . , “Polymer nanocomposites using zinc aluminum and magnesium aluminum oleate layered double hydroxides: Effects of LDH divalent metals on dispersion, thermal, mechanical and fire performance in various polymers”, Polym. Sci., 2009, 50, 3564-3574.

5. C. Manzi-Nshuti, D. Chen, S. Su, C. A. Wilkie., ” Structure-property relationships of new polystyrene nanocomposites prepared from initiator-containing layered double hydroxides of zinc aluminum and magnesium aluminum“, Polym. Sci., 2009, 94, 1290-1297.

6. C. Manzi-Nshuti, D. Wang, J. M. Hossenlopp, C. A. Wilkie., ” Fire retardancy of bis[2-(methacryloyloxy)ethyl] phosphate modified poly(methyl methacrylate) nanocomposites containing layered double hydroxide and montmorillonite”, Polym. Sci., 2009, 94, 1110-1118.

國際替代計量

以溶液聚合法製備鋰鋁、鎂鋁層狀材料/壓克力樹脂奈米複材及其性質探討

未授權

主題瀏覽