Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3628
標題: 長烷鏈規則樹枝狀高分子之製備及其超疏水效應研究
Super Hydrophobic Surface Based on Side Chain Dendritic Polystyrenes
作者: 陳朝欽
Chen, Chao-Cin
關鍵字: super hydrophobic
超疏水現象
honeycomb-like surface
dendrimer
規則樹枝狀高分子
蜂窩狀孔洞
出版社: 化學工程學系所
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摘要: 超疏水效應為目前熱門的研究課題之一,控制材料之表面能及表面粗糙度所形成之微米結構表面,便可模仿蓮葉上之超疏水行為。在本實驗中,我們使用具反應性與選擇性之單體4-isocyanato -4’(3,3-dimethyl-2,4-dioxo-azetidino) diphenylmethane (MIA),以收斂法進行逐步式的交替反應合成具有Polyurethane/malonamide且末端具有十八碳鏈不同代數之規則樹枝狀高分子( [G-0.5]-C18, [G-1.5]-C18, [G-2.5]-C18)。隨後我們進行聚苯乙烯之合成與改質,將聚合而成之聚苯乙烯改質成帶有一級胺之官能基爾後能與含有azetidine-2,4-dione規則樹枝狀高分子進行接枝形成不同代數之側鏈型規則樹枝狀聚苯乙烯(r-PSPVB-[G-0.5]-C18, r-PSPVB-[G-1.5]-C18, r-PSPVB-[G-2.5]-C18)。由於接枝後之高分子於側鏈分子結構上具有多重氫鍵,使得側鏈型規則樹枝狀聚苯乙烯具有製備蜂窩狀孔洞之能力。此外,規則樹枝狀結構之外圍為具有低表面能之長烷鏈分子,亦可提升高分子整體之疏水性。將合成之不同代數之側鏈型規則樹枝狀高分子進行蜂窩狀薄膜之製備與粗糙化。 在疏水性的測試中,於平膜接觸角之表現中,聚苯乙烯為85˚,在接枝規則樹枝狀高分子後側鏈型規則樹枝化聚苯乙烯之接觸角提升至94-99˚。在製備蜂窩狀結構時,由於r-PSPVB-[G-0.5]-C18之氫鍵不足,整體分子並不具有足夠之親水基穩定空氣中的水分子微粒,造成r-PSPVB-[G-0.5]-C18無法製備蜂窩狀孔洞基材其接觸角約為110˚。然而r-PSPVB-[G-1.5]-C18及r-PSPVB-[G2.5]-C18因結構之相對氫鍵數較高可輕易形成蜂窩狀孔洞構型。其中r-PSPVB-[G2.5]-C18因為氫鍵數較多,較易形成超過10 μm大小之大孔洞。測試條件為濃度2.5 mg/mL、風速1 m/s、溼度82 %下具有較佳之疏水性,r-PSPVB-[G-1.5]-C18蜂窩狀薄膜其接觸角可提升至130˚,而r-PSPVB-[G-2.5]-C18約為127˚。此外,利用蜂窩狀孔洞支柱脆弱的部份再進一步粗糙化後,r-PSPVB-[G-1.5]-C18薄膜接觸角可提升至165˚,而r-PSPVB-[G-2.5]-C18之薄膜在進行粗糙化時,10 μm之孔洞中不易進行粗糙化,使得接觸角只提升至150˚。
Super-hydrophobic surfaces have attracted much attention from both industrial and academic sectors. Much research has been focused on the imitation of the super hydrophobic property of naturally occurring plant leaves. It was reported the fundamental principles involved in fabricating a surface exhibiting this Lotus effect require that the material possesses water-repellent properties and exhibits sustainable roughness on the micrometer scale. In this work, a bi-functional compound, 4-isocyanato -4'(3,3-dimethyl-2,4-dioxo-azetidino) diphenylmethane (MIA), has been utilized as a building block to synthesize novel polyurethane/malonamide dendrons bearing long alkyl chains as the terminal group. Subsequently, the dendrons were grafted to amine-containing polystyrene to decrease the surface free energy. Moreover, these side chain dendritic polystyrenes with multi-hydrogen bond dendrons were capable of forming honeycomb-like surfaces. The modified super hydrophobic surfaces were investigated via contact angle measurement, atomic force microscopy (AFM) and field-emission scanning electron microscope (FE-SEM). For the smooth surfaces of the above-mentioned materials, the contact angle of polystyrene was 85˚. After dendrons were grafted to the polymer, the contact angle was enhanced to 94-99˚. On the other hand, a contact angle of 110˚ was obtained for the barely honeycomb-like surface caused by the short of hydrogen-bonding interaction in the dendritic polystyrene with 0.5 generation dendron (r-PSPVB-[G-0.5]-C18). Consequently, larger contact angles at 130o and 127˚ were obtained for the samples with 1.5 generation dendrons (r-PSPVB-[G-1.5]-C18) and 2.5 generation dendrons (r-PSPVB-[G-2.5]-C18), respectively. An optimized testing condition was suggested as the following: the humidity level: 82%; air flow rate: 1 m/s; polymer solution concentration: 2.5 mg/mL. After peeling the honeycomb-like surface, the contact angle of solid surface was 165˚ for the r-PSPVB-[G-1.5]-C18 sample.
URI: http://hdl.handle.net/11455/3628
其他識別: U0005-1208200701573300
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-1208200701573300
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