本研究乃是利用三種不同的表面官能化之矽酸鹽材,分別為APTS-magadiite、GPS-magadiite、MPS-magadiite,與聚亞醯胺(PI)以共價鍵結的方式合成APTS-magadiite/PI、GPS-magadiite/PI奈米複合材料,並分析其性質。而本研究所製備之片狀人工合成黏土Magadiite/聚亞醯胺奈米複合材料是採用層間插入法,首先使用插層劑CTAB(n-Hexadecyl trimethyl-ammonium bromide)與Na-magadiite做陽離子交換反應,合成CTAB-magadiite,之後再分別利用三種不同矽烷偶合劑(silane cupling agent)APTS(γ-Aminopropyltrimethoxysilane)、GPS(γ-Glycidoxypropyltrimethoxy- silane)、MPS(γ-Methacryloxypropyltrimethoxysilane)與CTAB-magadiite進行矽烷偶合化(silylation),製備具有反應官能基的APTS-magadiite、GPS-magadiite、 MPS-magadiite。再分別將APTS-magadiite、GPS-magadiite,和二苯胺ODA(diamine)單體與苯均四酸二酐PMDA(pyromellitic dianhydride)單體合成的聚醯胺酸(PAA)混合。然後經亞醯胺化(imidization),形成共價鍵結之APTS-magadiite/聚亞醯胺、GPS-magadiite/聚亞醯胺奈米複合材料。 APTS-magadiite/聚亞醯胺(PI)、GPS-magadiite/聚亞醯胺(PI)奈米複合材料的熱穩定性質經由TGA的分析,因加入層狀的黏土而下降。經由吸水性的分析,發現加了黏土之後,奈米複合材料,其吸水性較純的聚亞醯胺降低。在電性方面,APTS-magadiite/聚亞醯胺、GPS-magadiite/聚亞醯胺奈米複合材料在分別添加黏土後,介電常數提升,介電損失沒太大改變,電阻值下降,以GPS-magadiite/聚亞醯胺奈米複合材料改變較多。
Covalently bonded Magadiite/Polyimide nanocomposites have been synthesized by three kinds of surface modified Magadiite and Polyimide(PI). The properties of these nanocomposites were investigated. First, Na-magadiite was cation-exchanged with CTAB(n-Hexadecyl trimethylammonium bromide)to form CTAB-magadiite. CTAB-magadiite was silylated with APTS(γ-Aminopropyltrimethoxysilane)、GPS(γ-Glycidoxypropyltri- methoxysilane)、MPS(γ-Methacryloxypropyltrimethoxysilane) to form APTS- magadiite、GPS-magadiite、MPS-magadiite. Then, PAA, which consists of ODA(diamine), PMDA(pyromellitic dianhydride)was synthesized in DMAc ( N,N-Dimethylacetamide ). Subsequently, different amounts of APTS-magadiite、GPS-magadiite、MPS-magadiite in DMAc were mixed with PAA. The APTS-magadiite/PAA and GPS-magadiite/PAA and MPS-magadiite/PAA films were subject to thermal treatment for converting to APTS-magadiite/PI and GPS-magadiite/PI and MPS-magadiite/PI nanocomposites. The results of TGA analysis for APTS-magadiite/PI and of GPS-magadiite/PI reveal the thermal stability of the composites reduce due to the addition of Magadiite. It also found that the water adsorption rate of the nanocomposite is less than that of traditional PI. In the electrical properties of nano-composite, such as dielectric constant, dielectric loss and resistance vary with the content of Magadiite, particular for GPS-magadiite/PI.