- 學位論文
苯胺四聚體摻混石墨烯/奈米銀線與聚胺酯合成導電複合材料之物性探討
Synthesis and Characterization of Conductive Oligoanilines–Graphene / Ag nanowire -Polyurethane Composite Materials
摘要
利用氯化鐵(FeCl3)作為苯胺二聚體(aniline dimer)之氧化劑，經過了氧化還原的方式來合成出苯胺四聚體(tetraaniline)又稱聚苯胺。因聚苯胺本身質脆加工不易且機性性質差，其應用受到限制。故我們利用了具有彈性且柔軟的聚胺酯來改善這些缺點。 首先以預聚合法的方式，利用聚己內酯乙二醇(Poly-(caprolactone)-diol， PCL)分子量為2000作為軟鏈段，二苯甲基二異氰酸鹽(MDI)作為硬鏈段，反應生成有-NCO官能基的預聚物(prepolymer)，在其頭尾接上帶有-NH2官能基之苯胺四聚體，最後形成具有尿素基之共聚物(copolymer)。同時，將合成出來的共聚物(copolymer)去添加金屬奈米導電材料:奈米銀線及非金屬奈米導電材料:石墨烯，由於兩者本身結構具有獨特的性質，可以使基材在維持彈性的情形下，又可增加複合材料之導電度，使其應用非常廣泛，可應用於導電、電磁波防材料、環境密封材料等各種用途。 利用了FTIR、質譜儀來鑑定共聚物的化學結構，SEM來看複合材料的微觀結構，再藉由DMA、四點探針、XRD等來探討複合材料之物性。而本研究發現當石墨烯在導電彈性體中，具有至少150%的延伸率，而奈米銀線的導電彈性體拉伸率可達200%，導電度介於10-3~10-2 S/cm，且兩者導電度都會隨著彈性體的延伸率而提高。
並列摘要
The study is based on tetraaniline synthesized by using aniline dimer as monomer and FeCl3 as oxidant. However, tetraaniline are commonly classified as rigid, brittle, and difficult to process. And the experiment uses the polyurethane to improve its disadvantages. The prepolymer with -NCO group was obtained by the reaction of Poly-(caprolactone)-diol (PCL) as soft segments and 4,4-diphenylmethane diisocyanate (MDI) as hard segments which were with the molecular weight 2000 and 250 respectively. Then the tetraaniline could connect end to end in two shorts of the prepolymer with -NCO group to form copolymer. The copolymer could be blended with Ag nanowire or graphene as addition agent while dissolve in DMF. The structures of nanocomposites were investigated by FTIR spectra and MS. The analysis of microstructure was by SEM. The physical properties of nanocomposites were investigated by DMA, Four-point probe, and XRD. The experimental results of Ag nanowire content 3% in the copolymer, and the best conductivity is 4.60*10-2S/cm. However, the stretched molecular chains in nanocomposites are orientation as the increase in conductivity.