聚苯胺-石墨烯/奈米銀線與脂肪族聚氨酯複合材料之物性探討

Oligoaniline – Graphene / Silver Nanowires and Aliphatic Polyurethane Composite Materials

李溪銘(Hsi Ming Lee)

指導教授 ： 芮祥鵬

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2013年)

摘要

本研究是以苯胺二聚體做為單體，利用氯化鐵(FeCl3)為氧化劑合成苯胺四聚體。實驗中以分子量為2900的醚型聚氧四亞甲基二醇(PTMO)作為軟鏈段，以及脂肪族六亞甲基二異氰酸鹽(HDI)作為硬鏈段，反應生成PU預聚物。再以催化劑三乙基胺將苯胺四聚體接於預聚合物的頭尾兩端形成共聚物，藉以改善聚苯胺易碎裂之性質。

將合成完畢之共聚物以溶劑二甲基甲醯胺溶解後，添加石墨烯及奈米銀線，克服共聚物不導電的部分。最後加入十二烷基苯磺酸(DBSA)做苯胺四聚體摻雜劑，烘乾成膜形成具有彈性與導電性之奈米複合材料。

經FTIR鑑定共聚物及聚氨酯的化學結構，使用DMA研究共聚物之物性及玻璃轉移溫度(Tg)，利用Burger’s model模擬creep-recovery之行為，共聚物延遲時間會大於聚氨酯，因為含苯胺四聚體會降低彈性，使得回復性變差。使用阻抗計量測添加石墨烯及奈米銀線摻雜後複合薄膜拉伸導電度。在實驗結果得知，當共聚物混摻奈米銀線含量3%時，導電度為最好的6.12x10-2 S/cm，導電度也因延伸率增加而提高。

關鍵字

苯胺四聚體 ； 聚氨酯 ； 石墨烯 ； 奈米銀線 ； 導電薄膜

並列摘要

The study commences with the synthesis of tetraaniline by dianiline as monomer and FeCl3 as oxidant. The prepolymer was reacted with ether-type poly(tetramethyleneglycol) (PTMO) as the soft segments with molecular weight of 2900 and 1,6-hexamethylene diisocyanate (HDI) as the hard segments. Then using triethylamine as catalyst, the tetraaniline can connect the short chains end to end of the prepolymers into copolymer. By this method, we can enhance the intensity of bulk polyaniline.

After dissolving the synthetic product copolymer with solvent dimethylformamide (DMF), we then add certain amount of graphene and silver nanowires as additional agent to increase the electrical conductivity. At the final step, Dodecyl benzene sulfonic acid (DBSA) is added as dopant agent. After drying, the membranous nano-composite copolymer has the properties of elasticity and electrical conductivity.

We are able to obtain the chemical structures of the copolymer and polyurethane by FT-IR, the properties and glass transition temperature (Tg) of the copolymer by dynamic mechanical analysis, and creep-recovery behavior by Burger’s model simulation, retardation time of copolymer large than polyurethanes,beacause of teraaniline reduced the elastic behavior. In addition, we can examine the electrical conductivity aroused by graphene and silver nanowires through an impedance measurement method, and test the stretching conductivity with ohmmeter. From the result, we learned that the copolymer has the highest conductivity 6.12x10-2 S/cm as 3% silver nanowires within. Also, the conductivity rises as the stretching rate increases.

並列關鍵字

Tetraaniline ； Polyurethane ； Graphene ； Silver nanowires ； Conductive film

參考文獻

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