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|標題:||Characterization of The Flexible Substrate by PEN/MMT Nanocomposite Coated TiO2 Nanoparticles
由於MMT對降低PEN阻氣性的效果有限，所以再用電漿表面處理，增加PEN/MMT基材的表面粗糙度並改善其表面特性，以利之後阻絕層的披覆。阻絕層是用溶膠-凝膠法和高溫熱處理來製備二氧化鈦，再以其酒精溶液塗佈於PEN/MMT基材上，研究阻絕層對改善基材阻氣性之效果，發現3wt%MMT含量之PEN/MMT奈米複合材料其透水率由原本的8.35降至3.91 gm/m2‧day，降至原來之47 ％。
PEN(polyethylene naphthalate) containing naphthalate structure exhibits superior tensile strength, thermal stability and low permeability. Thus they have been widely used as air-bag and recording tapes. However, PEN still has some undesirable properties that limit their application be a flexible substrate of display.
In this report, we have used MMT as the dispersed phase to prepare PEN/MMT nanocomposites by melt-direct interaction of PEN into modified layered hosts. TGA, DMA, DSC, XRD, permeability and UV-visible spectrum have been used to analyze the properties of nanocomposite. From TGA and DMA results, they revealed that the heat stability in 1wt% content of PEN/MMT nanocomposite had been clearly increased, but it's not apparent for 3wt% content of PEN/MMT nanocomposite due to the worse dispersion. These results showed that the physical properties of nanocomposite would be directly revealed to crystalline feature and behavior of PEN. Both X-ray and DSC data reveal polymorphic behavior of PEN, depending on their thermal history. The parameter of crystallization kinetics determined by Avrami and Hoffman-Lauritzen theories were also discussed. Analyses from these theories indicated that PEN's phase transformed temperature shifted from 240℃ to lower temperature and increased crystallizatin rates while MMT was added. It was inferred that mobility of PEN's molecular chain which had been hindered by MMT to generates β-form crystals easily, and the increasing crystallizatin rates of PEN/MMT nanocomposite was also influence by MMT.
From the measurement of permeability and UV-visible spectrum, PEN/MMT substrates have lower permeability than PEN. The addition of 3wt% MMT content of PEN/MMT was decreased the transparency from 88% to 73%. This result indicates that the dispersion of modified MMT affects the permeability and transparency of nanocomposites directly.
Then PEN/MMT nanocomposite had been processed by nitrogen /oxygen plasma to increase the surface roughness of substrates which could be increased the adhesion between the substrate and barrier. Finally, nano-size of TiO2 particles were prepared by sol-gel method followed by thermal treatment and had been investigated by TEM and FESEM. From the TEM observation, and the particle sizes of TiO2 could be determined. The coated TiO2 on the surface of nanocomposite could be observed by FESEM and the addition of TiO2 layers on the surface of PEN/MMT nanocomposite could be further revealed the permeability from 8.35 to 3.91gm/m2‧day.
|Appears in Collections:||材料科學與工程學系|
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