高陽離子交換當量黏土/壓克力樹脂奈米複材之製備與性質研究

Preparation and Characterization of High Cation Exchange Capacity Clay/ Poly(methyl methacrylate) Nanocomposites

溫志國(Chih-Kuo Wen)

指導教授 ： 蔡宗燕

中原大學/理學院/化學系/碩士(2007年)

https://doi.org/10.6840/cycu200700657

摘要

本論文研究目的，藉由改質型層狀黏土的添加及有機/無機混成效應，改善PMMA 材料特性，包括熱穩定、機械性、氣體阻隔效應與UV 阻抗等。本實驗將針對兩種不同陽離子交換當量(Cation Exchange Capacity，CEC)之黏土，首先對其黏土進行鈉置換反應，以得到純度更高的黏土，並利用廣角X 光繞射儀(WAXD)鑑定其黏土之純度。為了使其與高分子的相容性獲得改善，再利用有機分子(Amphoterge K2)改質黏土性質，利用廣角X 光繞射儀、紅外線光譜儀(FT-IR)及熱重分析儀(TGA)確認所使用的有機改質分子已與黏土層間之鈉離子置換；再者，利用自由基聚合反應中的溶液聚合反應，製備出PMMA/clay 奈米級複合材料。在樣品之檢測上，首先利用廣角X 光繞射儀，對黏土在高分子中的分散性做一初步判讀，而在電子穿透顯微鏡(TEM)驗證下得到進一步之佐證，再利用熱重分析儀(TGA)及示差掃描熱卡計(DSC)探討複合材料熱裂解溫度(Td)與玻璃轉移溫度(Tg)之變化；並由動態分析儀(DMA)之檢測出其機械強度提升的程度。同時，依據黏土在PMMA 的分散性佳，在氣體阻隔效應及UV 阻抗性，可獲得顯著提升效果。

關鍵字

黏土 ； 溶液聚合法 ； 複合材料 ； 聚甲基丙烯酸甲酯

並列摘要

Polymer layered silicate nanocomposites show the enhanced physical, mechanical and chemical properties when compared to pure polymer. Different types of polymer matrices have been used to prepare nanocomposites. In this study, (PMMA)/clay nanocomposites were prepared by using poly (methyl methacrylate) (PMMA) as a polymer matrix and clay as an inorganic filler. There were two clays with different cation exchange capacity (CEC) applied to compare those properties. The clays have been modified, using Amphoterge K2 by ion exchange reaction. The modifying agent is used not only to increase inter layered spacing, but also the compatibility between the clay and polymer matrices. The modified clays have been characterized by wide angle X-ray diffraction pattern (WAXD), Fourier transform infrared spectroscopy (FT-IR) and thermo-gravimetric analysis (TGA). The PMMA/clay nanocomposites have been prepared by solution polymerization method. The powdered X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques were employed to study the morphology of the PMMA/clay nanocomposites. The thermo-mechanical properties were examined by thermo-gravimetric analysis (TGA), differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Gas permeability analyzer (GPA) shows the excellent gas barrier property of the nanocomposites which is consistent with the morphology. The optical property was measured by UV-VIS spectroscopy which shows that these materials have good optical property.

並列關鍵字

clay ； PMMA ； nanocomposites ； solution polymerization

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