- 學位論文
以實驗統計法改良丙烯酸-幾丁質接枝共聚合物並應用於吸附毒性有機物
Preparation of acrylic acid-modified chitin improved by an experimental design and its application in absorbing toxic organic compounds
摘要
本研究主要以丙烯酸(AA)為單體，Ce+4為起始劑，與幾丁質進行接枝共聚合反應，製成幾丁質-聚丙烯酸(Chitin-g-PAA)。並以傳統實驗方法改變Ce+4濃度、溫度及AA單體量，得到最高接枝百分比配方Ce+4為0.15 M、溫度50 ℃、丙烯酸5 克，其接枝百分比為163.1 %。再利用中心組合設計法(CCD)來改進傳統實驗設計法，獲得最佳配方為0.27 M Ce+4、54 ℃及5 克丙烯酸，此配方之理論接枝百分比為230.6 %，實驗結果與理論值一致，利用實驗統計法求得的最佳配方，有效增加傳統實驗方法之接枝百分比約1.4 倍。 Chitin-g-PAA進行水解轉化為鈉鹽的形式，製成新型吸附劑，運用在孔雀綠、巴拉刈與甲基紫等有機毒物的吸附，三種有機毒物的吸附等溫線的結果顯示Langmuir模式比Freundlich模式更能描述吸附行為，自製之吸附劑最大單層飽和吸附量qm (monolayer adsorption capacity)，對巴拉刈為322.6 mg/g-吸附劑、孔雀綠為256.4 mg/g-吸附劑及甲基紫為357.1 mg/g-吸附劑，此結果之吸附劑，可應用於血液灌注之有機毒物中毒患者的急救，極具應用價值。
並列摘要
This study covers the process that uses acrylic acid (AA) as a monomer and Ce+4 as an initiator to produce the graft copolymer of PAA and chitin (chitin-g-PAA) through graft copolymerization with chitin. By using the traditional experimental method to change the Ce+4 concentration, temperature and the quantity of AA monomers, the formula with the highest graft percentage is obtained: Ce+4 0.15 M, temperature 50 ℃, AA 5g, and the graft percentage 163.1%. The traditional experimental method is then further improved by using the central composite design (CCD) to achieve the optimum formula: Ce+4 0.27 M, temperature 54 ℃and AA 5g. Theoretically, the graft percentage for this formula is 230.6 %. The experiment results coincide with the theoretic values. As a result, the optimum formula from the experiment and statistical method effectively increases by 1.4 times of the graft percentage than that of the traditional experimental method. By converting chitin-g-PAA to the form of sodium salt through the hydrolysis process, it can be produced as a new type of absorbent, which can be used to absorb organic toxic substances, such as malachite green, paraquat and methyl violet, etc. The results of absorption isothermal curves of these organic toxic substances indicate that the Langmuir model is better in describing the absorption behavior than the Freundlich model. The monolayer absorption capacity (qm) for self-produced absorbents as paraquat, malachite green and methyl violet are 322.6, 256.4 and 357.1(in mg/g - absorbent), respectively. Absorbents of such results are very valuable in applications, which are of high potential in the future to be used in first-aid to victims with organic toxic substances during blood perfusion.