PARTⅠ水凝膠配方對吸水性尺寸大小及紫外線吸收之影響、PARTⅡ環氧樹脂/黏土奈米複合材製作

PARTⅠ The Effect of Compositions on the physical properties of the Hydrogel、PARTⅡ The Curing Properties of Epoxy/Clay Nanocomposite

黃俊凱(Chun-Kai Huang)

指導教授 ： 洪信國

元智大學/工程學院/化學工程與材料科學學系/碩士(2001年)

摘要

PARTⅠ
水凝膠配方對吸水性尺寸大小及紫外線吸收之影響
中文摘要
本研究在探討水凝膠配方成份對水凝膠尺寸、含水率、及紫外線吸收之影響。研究證實改質之紫外線吸收劑，使用量於1.2 phr時，對紫外線吸收程度可達ClassⅡ等級，含量增至2.0 phr時，則紫外線吸收程度即可達最優的ClassⅠ等級；同樣地，改質過的紫外線吸收劑含量在2.0 phr時，經多次高溫高壓測試，其紫外線吸收依然可達ClassⅠ等級，有極佳之耐熱性。
由實驗設計方法，改變水凝膠配方成份中的光起始劑、甘油（Glycerol）、及N-vinylpyrrolidone（NVP）比例，可知Glycerol含量影響尺寸，貢獻率為92.1％，Glycerol含量少，製作之水凝膠尺寸大；NVP則主影響含水率，貢獻率為82.1％，NVP含量多、含水率高；交聯劑含量的多寡則無明顯的影響。
PARTⅡ環氧樹脂/黏土奈米複合材製
中文摘要
本研究在對熱固性奈米複合材料做熱性質探討。將蒙脫土分散為奈米尺度後，再與雙酚A型環氧樹脂（EPON828）和胺類硬化劑（DICY）及催化劑（BDMA）摻合，使用熱分析儀器DSC在150℃、160℃、170℃及180℃下作恆溫硬化，可知速率常數（k）、反應級數（n）、放熱量（△H）、及活化能（Ea），由TGA測試重量損失，並由IR光譜測其反應前後官能基的變化。結果可知反應級數、速率常數及放熱量隨著反應溫度的升高而遞增，加入蒙脫土則反應活化能提高；由TGA的結果可知蒙脫土經單體的層間插入後，熱重量損失因單體的存在而變大，其劣化溫度隨升溫速率的增加而增加。由IR光譜可知升高反應溫度，增加環氧基的改變量。

關鍵字

水凝膠 ； 紫外線 ； 含水率 ； 尺寸變化 ； 實驗設計 ； 蒙脫土 ； 環氧樹脂 ； 硬化

並列摘要

PARTⅠ
The Effect of Compositions on the physical properties of the Hydrogel
Abstract
The effects of constituents on the dimensional change, water absorbability, and ultra-violet (UV) absorption of the hydrogel are studied. A modified UV absorbing compound is successfully synthesized. The UV absorbing power of the hydrogel can reach class I and class II standard with the addition of 2.0 and 1.2 parts per hundred of this UV compound, respectively. In addition, the modified UV stabilizer has very good thermal stability and remains unchanged after five cycles pressure cook sanitization. From the results of experimental design, it is concluded that the dimensional change of the hydrogel is mainly dependent on the glycerol content and whose effect can be as high as 92% of the total change. The resulting effect of N-vinylpyrrolidone content can contribute 82% of the total water absorbability of the hydrogel. While the effect of crosslinker content on the water content and the dimensional change is insignificant in this study.
PARTⅡThe Curing Properties of Epoxy/Clay Nanocomposite
Abstract
The curing and the thermal degradation properties of the epoxy and caprolactam intercalated clay composites are studied with Fourier transform infrared spectroscopy (FTIR)/differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA), respectively. It is obtained from FTIR and DSC analyses that the curing characteristics of the activation energy, the reaction order, the curing exotherm, and the curing rate are dependent on the curing condition and the presence of different clays. The results of TGA also indicate that the thermal degradation behaviors of the epoxy systems are also changed with the addition of various clays.

並列關鍵字

hydrogel ； ultra-violet ； water absorbability ； dimensional change ； experimental design ； clay ； epoxy ； curing

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