Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3812
標題: 製備主客型黏土/二氧化矽奈米混成材料及其聚苯乙烯奈米複合材料與物性分析
Preparation and Physical Properties of Host/Guest Montmorillonite Clay/Silica Nanohybrids and Their Polystyrene Nanocomposites
作者: 曾子凡
Tseng, Tzu-Fan
關鍵字: Clay
黏土
Silica
Nanohybrids
Nanocomposites
二氧化矽
奈米混成材料
奈米複合材料
出版社: 化學工程學系所
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摘要: 在本研究中,使用兩種新穎的方法來改質奈米黏土,進而製備聚苯乙烯/黏土/二氧化矽奈米複合材料。這兩種方法為摻混(Hybrid)法及原位形成(In-Situ Formation)法。摻混法是將二氧化矽膠體粒子與黏土在水溶液中進行異相凝集,使得二氧化矽粒子插入黏土層間,形成黏土/二氧化矽奈米混成物(nanohybrids);原位形成法是使二氧化矽原位生長在黏土表面,製備單片結構之黏土/二氧化矽模板(platelets)。此兩種改質黏土裡,二氧化矽為客(Guest)而黏土是主(Host),是為黏土/二氧化矽混成材料。製備之改質黏土再經過表面有機化後,以塊狀聚合法製備聚苯乙烯/黏土/二氧化矽奈米複合材料。在第一章中,將聚苯乙烯/黏土奈米複合材料作文獻回顧,並回顧高分子與奈米混成物之複合材料之文獻。第二章敘述奈米混成物之製備與分析。將帶正電的胺基矽氧烷改質之二氧化矽粒子與帶負電的層狀黏土以自我排列(self-assembly)的方式形成黏土/二氧化矽奈米混成物。在TEM及FESEM圖中,直徑22 nm的二氧化矽均勻地吸附在黏土表面或是黏土層間,出現超膠體(supracolloidal)分子構造,且小角度X光繞射數據中亦佐證二氧化矽在奈米混成物中之長距離規則排列。在BET結果討論中,推測此奈米混成物之構造同時具有偏位(biased)排列與均勻(uniform)排列的結構。在第三章中,製備及分析由此黏土/二氧化矽奈米混成物所製作的聚苯乙烯奈米複合材料。將此奈米混成物吸附陽離子界面活性劑,然而部分二氧化矽將因此而脫附於黏土表面;在聚合時,加入共單體甲基丙烯酸環氧丙酯(GMA)反應架橋於聚苯乙烯鏈上及二氧化矽上。在複材之斷裂面型態分析中,聚苯乙烯與黏土及二氧化矽之界面皆有良好的黏著性。含有2 phr的黏土、4 phr的二氧化矽及0.2 wt %的GMA之奈米複合材料,30 ℃下之儲存模數增加31 %,玻璃轉移溫度則沒有變化。此成分之奈米複合材料具有良好的尺寸穩定性,其熱膨脹係數降低78 %;且此奈米複合材料之水蒸氣阻氣性亦下降24 %。 第四章敘述黏土/二氧化矽模板之製備與分析,並製備具有高阻氣性的聚苯乙烯奈米複合材料。一個由環氧基矽烷偶合劑及有機胺合成的矽烷衍生物(SD),吸附在黏土表面後,再加入已水解之四乙基矽,使得二氧化矽合成於黏土表面,並且再利用三甲基氯矽烷接支於二氧化矽表面增進親油特性,製備成黏土/二氧化矽模板。在TEM及FESEM圖片中,觀察到直徑為7-11 nm的二氧化矽球型粒子在黏土/二氧化矽模板上;在固態29Si NMR中有Q3及Q4的無機矽的訊號;及ζ電位分析中出現二氧化矽的表面電位;在EDS分析中,Si/Al的元素比例隨已水解TEOS之添加而增加;在BET分析中,此黏土/二氧化矽模板為非孔洞材。在XRD及TEM分析此複合材料為均勻分散之脫層型奈米複合材料,此模板為單片分散在聚苯乙烯基材中,其平均黏土層間距離為221 nm。在氧氣透過率分析中,加入0.75 vol. %(1.5 wt %)的黏土/二氧化矽模板,可降低55 %;再由Nielson氣體透過方程式(Nielson tortuous path model)求得黏土/二氧化矽模板在聚苯乙烯基材中之長徑比為241-292,為分散性良好之聚苯乙烯/黏土/二氧化矽奈米複合材料。第五章說明此論文之結論以及對未來研究方向的建議。我們以摻混法及原位形成法所製備之改質黏土,可以有效地將黏土均勻分散在聚苯乙烯奈米複合材料中。
Two novel methods, the Hybrid method and the In-Situ Formation method, were used to modify montmorillonite clay in order to prepare exfoliated polystyrene/clay/silica nanocomposites by the free-radical polymerization in bulk. The Hybrid method adopts the aminosilane-modified colloidal silica (APS-Silica) as a spacer inserted into the montmorillonite clay galleries to form ordered APS-Silica/Clay nanohybrids. The In-Situ Formation method is the in-situ formation of SiO2 on the swollen clay to yield delaminated Clay-SiO2 platelets. In these two methods, the silica is the guest mounting on the host clay to prepare the host/guest clay/silica nanohybrids. In Chapter One, the PS/clay nanocomposites are reviewed by literature. The nanohybrids containing clay and inorganic particles are introduced as well as their polymer/nanohybrids nanocomposites also summarized by literature review. In Chapter Two, the self-assembly of cationic APS-Silica and anionic clay heterocoagulated by electrostatic attraction is revealed and characterized. The supracolloidal architecture of APS-Silica/Clay nanohybrids were investigated by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM), and confirmed by small-angle X-ray scattering. A proposed hybrid structure of APS-Silica/Clay is assigned to both the uniform packing and the biased packing based on Brunauer-Emmett-Teller surface area measurement and analysis. In Chapter Three, the APS-Silica/Clay nanohybrids were adsorbed with cationic dimethyldistearylammonium chloride to render their surface hydrophobic with a concomitant desorption of APS-Silica from clay surface. Comonomer glycidylmethacrylate (GMA) was introduced for the preparation of PS/clay/silica nanocomposites by in-situ grafting on APS-Silica/Clay nanohybrids to bridge the styrene monomer and inorganic aminosilane-grafted silica nanoparticles. Exfoliated nanocomposites were investigated by wide-angle X-ray scattering (WAXD) and TEM, from which a 22 nm diameter of APS-Silica nanoparticles were found to be mounted in the clay interlayers. The thermal properties and mechanical properties of nanocomposites are improved. The cryogenic fracture surfaces of PS nanocomposites exhibit good interfacial bonding among clay, APS-Silica and PS matrix. For PS/clay/silica nanocomposite containing 0.2 wt % of GMA and 2 phr of clay, the coefficient of thermal expansion is reduced by 78 % and the permeation of water vapor by 24 % compared with that of neat PS. Chapter Four studies the preparation and characterization of Clay-SiO2 platelets and their PS/clay/silica nanocomposites. The Clay-SiO2 platelets were prepared by modified clay, where the clay was absorbed with a silane derivative (SD) synthesized by 3-glycidylpropyltriethoxysilane and organoamine, followed by the polycondensation reaction with hydrolyzed tetraethyl orthosilicate. Trimethylchlorosilane was employed to organically modify Clay-SiO2 platelets. The isolated islands of SiO2 with a diameter of 7-11 nm grown on the clay surface were characterized by solid 29Si nuclear magnetic resonance (NMR), ζ potential and WAXD and also inspected by FESEM and TEM. Energy dispersive X-ray spectroscopy (EDS) shows the increased Si/Al atomic ratio with the increased input of hydrolyzed tetraethoxysilane. The non-porous structure of Clay-SiO2 platelets is also confirmed by BET. Highly dispersed Clay-SiO2 platelets were observed by TEM with an average interlayer distance of 221 nm obtained. Oxygen gas permeation of PS/clay/silica nanocomposites shows a 55 % reduction at a loading of 0.75 vol % (1.5 wt %) Clay-SiO2 platelets. As simulated by the Nielson tortuous path model, an aspect ratio between 241 and 292 for Clay-SiO2 platelets in the PS matrix is achieved. Chapter Five gives conclusions and future work suggested. The modification of clay via the Hybrid method and the In-Situ Formation method both demonstrate the plausible route to prepare a homogeneous dispersion of clay in PS matrix.
URI: http://hdl.handle.net/11455/3812
其他識別: U0005-1608201023195600
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-1608201023195600
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