Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3779
標題: 聚甲基丙烯酸甲酯/氧化鋅奈米複合材料製備與物性分析
Preparation and Physical Properties of Polymethyl methacrylate/Zinc oxide Nanocomposites
作者: 李柏源
Lee, Po-Yuan
關鍵字: PMMA
聚甲基丙烯酸甲酯
ZnO
Copolymer
Dispersion
氧化鋅
共聚物
分散性
出版社: 化學工程學系所
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摘要: 本研究中主要目的為製備無機物粒子分散性良好的氧化鋅/聚甲基丙烯酸甲酯(ZnO/PMMA)奈米高分子複合材料。先以溶液聚合法製備丙烯酸(Acrylic acid, AA)、丙烯酸丁酯(Butyl acrylate, BA)與甲基丙烯酸甲酯(Methyl methacrylate, MMA)的高分子共聚合物(ABM共聚物),並改變三種單體的比例各為AA:BA:MMA = 1:2:7、2:2:6與3:2:5,進而製備出三種有不同AA含量的ABM共聚物。 將ZnO粒子與ABM共聚物以溶液摻混方式混合後,經XRD與FTIR等分析可得知ABM共聚物中的羧酸(Carboxylic acid)官能基會溶解ZnO的晶格結構並吸附於ZnO粒子表面上;由沉降實驗可觀察得知,ABM共聚物可提升ZnO粒子在親油性有機溶劑中的分散穩定性。 進一步以溶液摻混法、塊狀聚合法與熔融混煉法等三種方式製備ZnO/PMMA奈米高分子複材,使用ABM共聚物作為ZnO粒子PMMA基材中的分散劑,利用ABM共聚物中的羧酸官能基與ZnO粒子表面產生吸附反應,而共聚物中親油性的高分子鏈段可與PMMA基材相容。由XRD分析得知當複材中的ABM共聚物的AA比例越高時,其溶解ZnO粒子的現象就越嚴重;由DSC與DMA分析得知ZnO粒子與ABM共聚物並不會對PMMA高分子的玻璃轉移溫度與機械強度有顯著的影響;由TGA分析得知ZnO粒子可有效地提升PMMA高分子的熱穩定性,而複材中加入易熱裂解的ABM共聚物卻會降低PMMA高分子的熱穩定性;由UV-vis分析得知當PMMA基材中加入ZnO粒子時會大幅降低可見光(550 nm) 對ZnO/PMMA複材薄膜之透射度,而複材中加入ABM共聚物會則會提升ZnO/PMMA複材薄膜的可見光之透射度,顯示ABM共聚物可改善ZnO粒子於PMMA基材中的分散性;而由SEM與TEM分析亦可以觀察出當ZnO/PMMA複材中加入ABM共聚物時,其ZnO粒子的分散情形較鬆散且分散範圍較廣;另外,當ABM共聚物中AA的比例越高時,其幫助ZnO粒子分散的功能就越顯著,由此可知ABM共聚物中的羧酸官能基是本研究中提升ZnO粒子分散性的一個主要因素。
The main purpose of this study is to fabricate zinc oxide/polymethyl methacrylate (ZnO/PMMA) nanocomposites with well-dispersed ZnO nanoparticles. Firstly, we used solution polymerization to prepare the copolymers (ABM copolymers) made of acrylic acid (AA), butyl acrylate (BA) and methyl methacrylate (MMA), and the ratios of these three monomers (AA:BA:MMA) had been respectively varied to 1:2:7, 2:2:6 and 3:2:5. In the following experiments, we used solution blending method to mix ZnO nanoparticles and ABM copolymers together. In XRD and FTIR analysis, we found that the carboxylic acid groups of ABM copolymer could dissolve ZnO crystalline and adsorbed onto the surface of ZnO nanoparticles. In the sedimentation test, we observed that ABM copolymers enhanced the stability of dispersion of ZnO nanoparticles in the hydrophobic organic solvent. Furthermore, we used solution blending, bulk polymerization and melt blending method to fabricate ZnO/PMMA nanocomposites. The ABM copolymers had been used as compatibilizers for ZnO nanoparticles dispersed in PMMA matrix. The carboxylic acid groups of ABM copolymers can adsorb onto the surface of ZnO nanoparticles, and the hydrophobic moiety of ABM copolymers can compatibilize with PMMA matrix. Via XRD analysis, we found that the ZnO nanoparticles had been dissolved more severely as the portion of acrylic acid in the ABM copolymer raised. In DSC and DMA analysis, we found that ZnO nanoparticles and ABM copolymers had no apparent influence on the glass transition temperature and the mechanical strength of PMMA matrix. Data from TGA analysis indicate that ZnO nanoparticles evidently enhance the thermal stability of PMMA matrix. However, the addition of the easily decomposed ABM copolymers in PMMA reduces the thermal stability of PMMA matrix. Via UV-vis analysis, we observed that adding ZnO nanoparticles into PMMA matrix dramatically decreased the transparency of ZnO/PMMA nanocomposites films. Whereas adding ABM copolymers into ZnO/PMMA nanocomposites as the compatibilizers can increase the transparency of ZnO/PMMA nanocomposites films. Hence, it's obvious that the ABM copolymers improved the dispersibility of ZnO nanoparticles in PMMA matrix. After inspected by SEM and TEM analysis, we found that if ZnO/PMMA nanocomposites containing ABM copolymers as compatibilizers, ZnO nanoparticles would loosely and widely disperse in PMMA matrix. In addition, the capability of ABM copolymer to improve the dispersibility of ZnO nanoparticles increases with the portion of acrylic acid in the ABM copolymer. Therefore, we suggest that the amount of carboxylic acid groups in ABM copolymer is one of the important factors to aid the dispersion of ZnO nanoparticles in PMMA matrix.
URI: http://hdl.handle.net/11455/3779
其他識別: U0005-2707200917523300
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2707200917523300
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