聚苯乙烯/蒙脫土奈米複合材料之合成與性質研究

Preparation and Properties of Polystyrene/Montmorillonite nanocomposite Materials

林志光(Chih-Kuang Lin)

指導教授 ： 葉瑞銘

中原大學/理學院/化學研究所/碩士(2002年)

https://doi.org/10.6840/cycu200200128

摘要

摘要
我們將無機相的層狀蒙脫土，藉由陽離子界面活性劑進行親油化改質，有效地分散於有機相的苯乙烯單體溶液中，並進一步進行熱自由基聚合反應，製備了由高分子／親油化改質蒙脫土所組成的一系列不同比例聚苯乙烯／蒙脫土奈米複合材料。
首先，有機相的苯乙烯單體進入親油化改質過的層狀蒙脫土層間區域之中，接著進行自由基熱聚合反應。所得的產物並以FTIR、XRD、與TEM來進行分析鑑定；並利用GPC來量測並評估奈米複合材料中的有機高分子聚合物的分子量大小；進一步將此材料製成自由立膜，以GPA測量其氣體穿透性；再以電化學方法量測此材料的防腐蝕性質；並再使用TGA與DSC來評估其熱性質。此外，我們並嘗試調整溶液pH值來探討蒙脫土的膨潤性，以尋求蒙脫土改質之最佳條件。

關鍵字

奈米複合材料 ； 聚苯乙烯 ； 蒙脫土

並列摘要

Abstract

A series of polymer-clay nanocomposite (PCN) materials that consisted of polystyrene (PS) and layered montmorillonite (MMT) clay were prepared by effectively dispersing the inorganic nanolayers of MMT clay in organic PS matrix via in-situ thermal polymerization. Organic styrene monomers were first intercalated into the interlayer regions of organophilic clay hosts and followed by a typical free radical polymerization. The as-synthesized PCN materials were characterized by infrared spectroscopy, wide-angle powder X-ray diffraction and transmission electron microscopy. PCN coatings with low clay loading (e.g., 1wt-%) on cold-rolled steel (CRS) were found much superior in anticorrosion over those of bulk PS based on a series of electrochemical measurements of corrosion potential, polarization resistance, and corrosion current in 5 wt-% aqueous NaCl electrolyte. The molecular weights of PS extracted from PCN materials and bulk PS were determined by gel permeation chromatography (GPC) with tetrahydrofuran as eluant. Effects of the material composition on the molecular barrier, and thermal stability of PS along with PCN materials, in the form of both free-standing film and fine powder, were also studied by molecular permeability analysis, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), respectively. The swelling abilities of MMT clay under different pH value were also investigated.

並列關鍵字

Polystyrene ； Montmorillonite ； Nanocomposite

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