在許多的硬桿式高分子上側接一柔軟長鏈，會形成液晶之結構。本研究合成氮上與碳上側接烷鏈之聚吡咯以觀察不同接枝位置對液晶行為之影響。
由於聚吡咯會吸收可見光而成暗黑色，所以由偏光顯微鏡中無法看出其變化，故以DSC輔以X-ray繞射儀來觀察其相變化。在觀察的過程中，我們僅可在氮上取代十八烷鏈之聚吡咯上得到明顯之液晶相變化。此外，我們在對其做shear與solvent cast之動作時，可發現在高角度存在d-spacing 2.8 Å與3.2 Å之有趣繞射峰，此一現象在硬桿式的高分子上常可見到，惟目前尚無法解釋。
另外，對其不同位置之取代，亦產生不同之結果。碳上接枝較氮上接枝有較大之d-spacing，此乃由於氮上之共平面性較差，以致接枝出去之烷鏈偏移角度更大，所以其d-spacing較小。經由correlation function之計算，我們可以得知無論在氮上或碳接枝，側鏈越長，主鏈之起伏越大；但其層狀結構越好。

Attaching soft long side chain on conjugated polymers will form liguid cystal structure. Our research is to synthesis the polypyrrole with alkyl chains on nitrogen site and carbon site and observe the effects.
We observe the phase transition by X-ray and DSC. But it is hrad to observe because of its absorbing light. Between observing, we just can find the liguid crystal transition on the polypyrrole with octadecane alkyl side chain on nitrogen site. Besides, we can find the 2.8Å and 3.2Å peaks
By shearing and solvent casting. Such a phenomenon is common in conjugated polymers. But it is hard to explain.
Besides, substituted on different sites will bring different results. Substituted on nitrogen site will lead to bigger d-sapcing than substituted on carbon site. This is because of the difference on co-planity. By the correlation function, we can realize that longer side chain, bigger fluctuation, but better layer structures.

摘要
第一章、緒論
第二章、文獻回顧
第三章、實驗方法
第四章、單體之合成與聚合
第五章、結果與討論
第六章、結論
參考文獻

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