- 學位論文
次微米級孔隙性聚醯亞胺顆粒之製備
Preparation of submicron-sized porous polyimide particles
摘要
本實驗製備孔隙或中空聚醯亞胺顆粒，利用沉澱聚縮合反應製得次微米級單一散度聚醯胺酸顆粒當作粒種，加入稀釋劑（如水、醋酸酐、氰甲烷）腫脹粒種，再以醋酸酐為脫水劑進行化學醯亞胺化或加熱進行熱醯亞胺化，再經由真空乾燥，製成具孔隙或中空聚醯亞胺顆粒。主要目標是：(1)探討稀釋劑種類及劑量，對顆粒表面及內部結構的影響，期望瞭解孔隙或中空結構形成的機制。(2)探討醯亞胺化過程對顆粒形成的影響。 由實驗結果得知，使用水為稀釋劑，所造成聚醯胺酸顆粒其具有微孔的結構。當稀釋劑為醋酸酐或氰甲烷和水混合時，隨著稀釋劑量的增加，顆粒內部結構會由中空微球分散於顆粒中的結構逐漸轉變為單一中空結構。而由溶劑甲苯釋放實驗可進一步證實顆粒有孔隙或中空結構的存在。進行熱醯亞胺化會導致顆粒產生變形，無法維持其孔隙或中空結構，而使用醋酸酐進行化學醯亞胺化其聚醯亞胺顆粒由於醯亞胺化程度較差，熱性質較熱醯亞胺化所製之聚醯亞胺顆粒性質差，但相對地不會破壞顆粒之孔隙或中空結構。
並列摘要
The objective of this work is to prepare porous or hollow polyimide particle. Submicron monodisperse poly(amic acid) particles prepared by using precipitation polycondensation were have been used as seeds. Diluents (water, acetic anhydride, aetonitrile) was added to swell seeds. Subsequently, porous or hollow polyimide was formed by chemical imidization with adding acetic anhydride as dehydration agent or by thermal imidization. The main objectives of this study are: (1) to investigate the effect of the kind and amount of diluents on the surface and interior morphology on the polymer particles, and expect to understand the mechanism of porous or hollow particle formation. (2) to investigate the effects of kind of the imidization on morphology formation of the polyimide particles. From the experimental results, porous poly(amic acid) particle can be prepared by using water as diluent. When acetic anhydride or acetonitrile as the diluent, respectively, the multihollow particles turn into hollow particle with increasing the amount of diluent. In order to clarify the multihollow or hollow structure in detail, the evaporation behavior of toluene of solid particles and multihollow or hollow particles is investigate. Thermal imidization can destroy the structure of porous or hollow particles. Chemical imidization can retain the structure of porous or hollow polyimide particles, but the degree of imidization and thermal property of polyimide is poor than those of thermal imidization.
參考文獻
延伸閱讀
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