基於氣相沉積與昇華在氣相逐層建構多孔高分子複合材料

Abstract

本研究透過氣相昇華和沈積聚合合成多孔聚合物複合材料，複合材料以逐層方式構建，形成由多孔材料與緻密的聚對二甲苯薄膜組成的單一高分子複合材料。這種氣相昇華和沈積聚合過程是基於冰塊模板的消失性質，因此能製作出與模板外觀相同的多孔隙結構。在此研究中，通過昇華時間的控制，展示了不同厚度的多孔塗層，並用立方體形狀的冰模板製造了可控孔洞大小的多孔結構。通過改變昇華速率，實現了孔徑為1.4μm、4.7μm、16.2μm和70.4μm的多孔結構。最後，在多孔結構中使用甘油作為暫時基板以沉積聚對二甲苯薄膜，結合傳統鍍膜製程與新穎的多孔性聚對二甲苯結構，製作出多層複合結構，此複合材料分別由多孔聚對二甲苯結構與頂部和底部的兩層聚對二甲苯薄膜組成。本文介紹的技術為製造多孔塗層和聚對二甲苯聚合物複合材料提供了新的方法，在模擬複雜的生物微環境方面具有巨大的潛力。

Porous polymer composite was synthesis based on vapor sublimation and deposition polymerization, the composite was built in a layer-by-layer fashion to form a single polymer composite consist of porous and dense film parylene. This vapor sublimation and deposition polymerization process was based on vanishing nature of ice template and thus gives exact same replica of parent template. In the study, porous coating with various thickness were demonstrated by sublimation time control and controlled porous structure was fabricated with cube shape ice template. By changing the sublimation rate, porous structure with pore size of 1.4μm, 4.7μm, 16.2μm and 70.4μm was achieved. Lastly, glycerol was used as temporary substrate in the porous matrix for parylene film deposition and resultant composites was composed of two layers of parylene film on the top and bottom of porous parylene respectively. The technology introduced herein provide novel approach to fabricated porous coating and parylene polymer composites which has huge potential in mimicking complex bio micro environment.