聚甲基丙烯酸甲酯/黏土及聚亞醯胺/氧化鋁奈米複合材料之製備與性質研究

Preparation and properties of Poly（methyl methacrylate）/Clay and polyimide/Al2O3 Nanocomposite materials

張玉玟(Yu-Wen Chang)

指導教授 ： 葉瑞銘

中原大學/理學院/化學研究所/碩士(2003年)

https://doi.org/10.6840/cycu200300083

摘要

本研究可分為兩部份，第一部份為Poly(methyl methacrylate) / Clay之有機/無機奈米複合材料，此研究是將親油化改質後之無機黏土以溶液分散（Solution Dispersion）的方式，分散在有機壓克力(PMMA)基材上來製備奈米級之壓克力/黏土複合材料。 首先，藉由四級銨鹽（Dodecyltrimethylammonium Chloride）做為陽離子交換之改質劑來膨潤黏土，使原本具親水性之蒙脫土改質為具親油性之有機化蒙脫土，來製備添加不同比例的親油化蒙脫土和PMMA的奈米級複合材料。 在本研究中，將探討此合成之奈米級複合材料其金屬防蝕性。 研究結果顯示，當親油化蒙脫土的比例增加時，其金屬防腐蝕的性質也會大大的提升。 並且藉由阻氣阻水性性質的量測來佐證防蝕性能的提升。
第二部份為Polyimide / Al2O3之奈米複合材料，研究主要是利用ODA / OPDA等單體利用螯合技術導入無機的氧化鋁製備成一系列之有機/無機混成的聚亞醯胺/氧化鋁薄膜，並探討有機/無機混成薄膜的特性與無機物（氧化鋁）在聚亞醯胺（Polyimide）基材中的分散性。 本論文主要針對所製備的混成薄膜的結構、表面型態、熱性質分析等做了初步的探討。 實驗結果顯示所製備的有機/無機混成薄膜有均勻的結構，熱性質則因導入無機氧化鋁而有提升，隨著無機氧化鋁含量的增加光學性質亦隨之變化，就阻氣、阻水性質方面而言，亦因無機氧化鋁的增加而大大提升了材料阻氣及阻水的效果。就型態學方面，我們藉由 SEM 與 TEM 的影像測試證實了無機物的微粒均勻分佈於聚亞醯胺基材中。

關鍵字

奈米複合材 ； 聚甲基丙烯酸甲酯/黏土 ； 聚亞醯胺/氧化鋁

並列摘要

This thesis can be divided into two parts. For the first part, a series of nanocomposites materials consist of poly(methyl methacrylate) (PMMA) and layered montmorillonite (MMT) clay were prepared by effectively dispersing the inorganic nanolayers of MMT clay in an organic PMMA matrix via solution dispersion technique . The organophilic clay was first prepared by a cationic exchange reaction between the sodium cations of MMT clay and alkylammonium ions of intercalating agent, dodecyltrimethylammonium chloride, followed by a preparation of PMMA-MMT nanocomposite materials. PMMA - Clay coatings with low clay loading on cold-rolled steel were found much superior in anticorrosion over those of PMMA - Clay based on a series of electrochemical measurements of corrosion potential, polarization resistance and corrosion current, in 5 wt% aqueous NaCl electrolyte. The resulting composites in the form of free-standing film exhibited decreased permeability of O2 and H2O vapor. This is presumably caused by barrier property of the silicate nanolayers of clay dispersing in a PMMA matrix to increase the tortousity of the diffusion pathway of oxygen and water.
For the second part, organic-inorganic hybrid nanocomposite materials based on Al2O3 and polyimide derived from ODA（4,4- Oxydianiline） and OPDA（4,4- Oxydiphthalic anhydride） were prepared. The structure and properties of the obtained Polyimide / Al2O3 composite materials were characterized in this study. As the inorganic content increased , the thermal stability of the hybrid increased slightly. The Al2O3 particle size in the hybrid increased from 86.02 nm ~ 91.30 nm for the hybrid containing 1 molar ratio Al2O3 to 231.52 nm for the hybrid containing 10 molar ratio Al2O3. The O2 and H2O permeability of the nanocomposite membrane with Al2O3 content 10 molar ratio was 0.133 and 41.5 barrer respectively , which is higher than that of pure polyimide. This is presumably caused by barrier property of the Al2O3 particle dispersing in a PI matrix to increase the tortousity of the diffusion pathway of oxygen and water.

並列關鍵字

PMMA/Clay ； PI/Al2O3 ； Nanocomposite

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