聚醯亞胺/多壁奈米碳管複材電性質探討

Electrical Characterization of Polyimide/Multi-wall Carbon Nanitubes Composite

古必聖(Pi-Sheng Ku)

指導教授 ： 程耀毅

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2011年)

摘要

本實驗以合成聚醯胺酸(PAA)加入導電材料多壁奈米碳管，並以旋轉塗佈和階段性熱熟化步驟製備不同比例的聚醯亞胺/奈米碳管複材，並分為兩部分做研究探討。其一為利用電漿技術對複材進行表面處理，期望能有效降低表面電阻達到抗靜電效果。經由超絕緣儀 (super megohmmeter) 的測詴中得知，在電漿功率提升至100W時，電阻值是明顯的下降。且使用少用量的奈米碳管，不僅能減低成本亦可達到抗靜電的標準。
另一部分則是將奈米碳管表面藉由耦合劑化學方式改質，進一步提升與高分子間的相容性及分散性，且期望能夠從溶膠-凝膠實驗中找出耦合劑與碳管最適當的比例來改質奈米碳管。從FTIR與ESCA的結果可知利用耦合劑改質碳管是成功的，並以TEM佐證之。複合材料在TGA熱分析和萬能詴驗機的結果顯示，加入越多矽烷耦合劑進行改質的奈米碳管，其熱穩定性和機械性質效果最佳。而複材之導電性由實驗結果顯示，適當含量矽烷化改質碳管的複合材料，能有效的降低表面電阻。

關鍵字

聚醯亞胺(PI) ； 多壁奈米碳管(MWCNTs) ； 奈米複合材料 ； 電漿處理(Plasma Treatment) ； 耦合劑(GOTMS)

並列摘要

Various ratios of conductive multi-walled carbon nanotubes (CNTs) were added to the polyamic acid (PAA) to prepare polyimide / carbon nanotube (PI/CNTs) composites by spin coating and four-step thermal curing. The studies were divided into two parts. First, we expected to reduce the surface resistance to minimize electrostatic effect by using plasma surface treatment of these PI/CNTs composite. The electrical conductivity of PI/CNTs nanocomposites was obtained by Super Megohmmeter. When the plasma power is increased to 100W, the resistance of the composites is significantly reduced. Moreover, through the plasma treatment, a small amount of carbon nanotubes can not only reduce costs, but also meet electrostatic charge (ESC) criterion.
In the second part of this study, the surface chemical modified CNTs by the coupling agent can further improved the compatibility and dispersion in the PI matrix. We found the optimal ratio of coupling agent to carbon nanotubes in the sol - gel experiment. The analysis of FTIR and ESCA proved the successful chemical modification of the CNTs surface by the coupling agent. There is more evidence provided by the TEM. Results of TGA and universal testing machine revealed that higher ratio of silane coupling agents to carbon nanotubes increased the thermal stability and mechanical properties. However, conductivity measurements showed that less amount of silane couple agent was necessary to effectively reduce the surface resistance.

並列關鍵字

Polyimide(PI) ； Multi-wall carbon nanotubes(MWCNT) ； Nanocomposite ； Plasma Treatment ； Coupling agent(GOTMS)

參考文獻

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