- 學位論文
具有核-殼型態之聚N-異丙基丙烯醯胺吸濕材的製備及性質研究
Preparation and Characterization of Poly(N-isopropylacrylamide) Core-shell Hydrogel for Adsorbent
摘要
本研究目的為利用聚N-異丙基丙烯醯胺(P-NIPAm)的溫度敏感特性，探討其做為除濕材料的可行性。由於NIPAm具有溫度敏感性質，P-NIPAm在低於相轉移溫度(LCST)時，親水特性將水分子儲存於膠體內，當溫度提升至相轉移溫度LCST(32℃)附近或更高溫度時， P-NIPAm由親水性急遽轉為親油性進而將水分子排出膠體外達到除去濕氣完成再生，可免除再生時水的相變化所需蒸發熱，由於再生不需利用潛熱，可大幅節省能源消耗。 利用沉澱聚合法將NIPAm及交聯劑N,N'-methylenebisacrylamide共聚合得到core粒子，由於P-NIPAm在空氣中捕捉水氣之能力不理想，因此再添加具有磺酸根或羧酸根之單體與NIPAm單體共聚合，如2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) 、 styrene sulfonic acid (SSA) 或 methacrylic acid (MAA)做為shell層，製備出具有Core-Shell型態之球型吸濕水膠。由於利用帶有酸根的單體加入聚合系統中，使水膠顆粒表面形成一較強的吸水層，水膠粒子將具有更佳的吸濕能力，來達到本研究除濕的目的。本研究利用固體動態吸附裝置，進行水膠粒子吸濕量的量測。探討不同酸棖及酸根含量的多寡對於吸濕量及再生效果的影響， 實驗結果，具有酸根之水膠相較於純P-NIPAm水膠粒子，確實有較佳之吸濕效果，而且隨酸根量增加，吸濕效果亦會增加。水膠粒子吸濕後，進行再生實驗在50℃下再生2小時即可達到良好的再生效果。
並列摘要
In this study, utilization the thermo-sensitive property of Poly N-isopropylacrylamide (NIPAm) to investigate the possibility for it to use as dehumidified material. As the temperature higher than their LCST, these particles become more hydrophobic and can expel the intake water, that is regeneration of the dehumidizer without need heat of the evaporation. This method can saving more power resources. NIPAm and N,N'-methylenebisacrylamide, crosslinking agent, was polymerized into copolymer particles by using precipitation polymerization as a core. Due to the poor capacity of the capture water molecular in air, monomer containing sulfonic acid or carboxylic acid group, such as: 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) 、 styrene sulfonic acid (SSA) or methacrylic acid (MAA) will be polymerized on the outer of the core particles as a shell region to improve the capacity of the intake water molecular in the air. Core-shell polymer particles will be obtained in this way. The hydrogel particles are easier to catch water molecule from air, because their surface form a stronger absorbent layer when the monomer has acid group entered polymerization system. The ability of dehumidification of these particles were determined by the dynamic adsorption apparatus. The effects of different acid group, extent of the acid group on the capacity and regeneration will be investigated. The adsorbed amount of hydrogel particles have acid groups were more than pure P-NIPAm hydrogel particles, and furthermore the adsorbed amount of hydrogel particles were increased as acid group increase. And the particles after dehumidification experiment were heated 2 hours under 50℃ can reach a good efficiency of regeneration.