| Summary: | 碩士 === 中原大學 === 奈米科技碩士學位學程 === 102 === There are two types of inorganic layered materials ,which are natural montmorillonite (Clay) and synthetic lithium aluminum layered double hydroxides (LiAl LDH).applied as additives which natural clay was treated by sol - gel process (Sol-gel) to delaminate the stacked layers, crosslinked network formed between the clay. lithium aluminum layered double hydroxides synthesized by coprecipitation method and hydrothermal method, followed by intercalating Dimethyl 5-Sulfoisophthalate (DMSI) in to the layers by negative Ion-exchange method. Through a wide-angle X-ray Diffraction (WXRD), Thermal Gravimetric Analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR) could understand the before-and-after changes of the interlayer spacing and modification of modified clay, as the Scanning Electron Microscope (SEM-EDS) observations form the layered material. Added the Inorganic layered materials which were modified into the Poly(ethylene terephthalate) (PET) in the preparation of nanocomposites when Micro compounding, and discuss the reasons and influence of its thermal stability, crystalline, mechanical properties, UV resistance, and gas barrier property .
From Wide-angle X-ray Diffraction (WXRD), Transmission Electron Microscopy (TEM), nanocomposites would understand the layered material in polyethylene terephthalate in the dispersion, using thermal gravimetric analyzer (TGA) to measure the thermal decomposition temperature (T5d), added LDH-DMSI thermal stability to race the original 393.6 ℃ to 403.1 ℃; the composites temperature (Tcc) measured by Differential Scanning Calorimetry (DSC) , increased from 195.1 ℃ to 200.5 ℃. Composites storage modulus tested by Dynamic Mechanical Analyzer (DMA), upgraded to 36.7 percent when adding CL120-SiO2; upgrade only 11.87% when adding LDH-DMSI. Finally, the Gas Permeation Analyzer (GPA), UV - visible spectrophotometer (UV-Vis) were used testing the composites resistance of the gas, optical properties; Gas barrer of CO2 lower from the original 2.39 barrer to 1.77 barrer by adding delamination of montmorillonite CL120-SiO2, the upgrade is 1.34 times; optical properties can improve barrier against UVA 28.04%, UVB enhance 63.80%, and still has a 92.9% visible light transmittance.
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