自從發現共軛高分子的導電性之後，便有大量研究應用於光電元件上，包含發光二極體、電晶體以及太陽能電池。近年來因為側鏈為共軛基團的非共軛高分子具有良好的溶解度和光電性質，所以也受到大量的注目。共軛高分子中，導入電子施體可以增強對於電洞的傳遞速率及提高HOMO能階，進而降低電洞由電極注入的能障;導入電子受體可以降低LUMO能階，提高電子注入能力。故因應不同材料的需求，可以調整電子施體/受體的比例來達到所需。
此論文合成一系列在側鏈上帶有不同比例電子施體/受體的共聚高分子，並鑑定其光電特性以探討側鏈共軛集團特性與含量對共聚高分子性質的影響。電子施體的部分是使用常被拿來做為光電材料的pyrene，它具有特殊的螢光性質，常被用來設計螢光感測器；電子受體使用2,1,3-benzothiadiazole (BT)，它的電子親和力很高，所以常被拿來當作電子傳遞材料。論文中使用Suzuki反應合成出施體和受體單體，再利用自由基聚合分別合成了三種Py含量不同的P系列共聚高分子、三種BT含量不同的B系列共聚高分子以及含有三種不同Pyrene/BT比例的PB系列共聚高分子，接著把三個系列的高分子做了光物理性質以及電化學性質的檢測。
由UV吸收可看到P系列和B系列的吸收度都因Pyrene和BT的含量增加而有增加的趨勢；PB系列則可明顯看到因Pyrene及BT含量不同造成的吸收值變化。由PL可看到P系列因為Py含量增加而有明顯的monomer轉成excimer訊號的變化；B系列則因為分子內電荷轉移的影響，所以BT含量愈高，溶液螢光強度下降的情形；PB系列則可發現BT含量較多的高分子溶液螢光強度下降的情形。CV圖則顯示P系列中P1因Pyrene含量太少導致無氧化峰，不過由P2及P3則可看到因Pyrene增加導致的HOMO能階的提升；B系列則可能因為含量差異性不大使得無明顯的LUMO能階變化；PB系列無發現明顯的規則性可能是由於Pyrene及BT含量不夠多導致。

Since the discovery the conductivity of conjugated polymers, more and more researches have been dedicated to their applications in opto-electronic devices, including light emitting diodes (LEDs), transistors, and solar cells. Recently, because of good solubility and some special properties, non-conjugated polymers with conjugated groups as side chains attract lots of attentions. In conjugated polymers, the hole mobility can be enhanced and the HOMO level could be raised by incorporating with electron donor. Furthermore, it can lower the hole injection barrier from the electrode so that the ability of hole injection increases. Incorporating the electron acceptor, on the other hand, can lower the LUMO level and increase the ability of electron injection. So the desired optoelectronic properties might be achieved through adjusting the ratio of donors to acceptors.
In this study, we report the synthesis of polymers containing different ratio of donor to acceptor in the side chains, and explore the opto-electronic properties in order to discuss the effect of the properties and content of side chain groups on copolymer properties. We use pyrene, which are often applied to electro-optical materials, as electron donor. It contains unique fluorescence properties, which can be utilized to design various types of fluorescence sensors. Furthermore, we use 2,1,3-benzothiadiazole as electron acceptor because it contains high electron affinity, and it is often regarded as electron transport materials. Herein, two monomers containing donor or acceptor are prepared by Suzuki coupling reaction, and copolymers with conjugated pendants are prepared by free radical polymerization. P or B series copolymers are composed of styrene and pyrene or 2,1,3-benzothiadiazole, respectively, with three different ratios of styrene to pyrene (or 2,1,3-benzothiadiazole). PB series copolymers are composed of styrene, pyrene and 2,1,3-benzothiadiazole with contain three different ratios of pyrene and 2,1,3-benzothiadiazole. Finally, photophysical and electrochemical properties of these three series of copolymers are characterized to investigate the structure-property relationship.
The absorbance increases as the content of pyrene and 2,1,3-benzothiadiazole in P and B series increase, and the relative absorbance of respective characteristic peaks is in good agreement with the ratio of donor to acceptor in PB series. From the fluorescence spectra of P series, the monomer band changes to excimer band as the pyrene content rises. In B series, the fluorescence intensity decreases as BT content increases due to the intramolecular charge transfer. In PB series, copolymers of high BT content show relatively low fluorescence intensity. In cyclic voltammograms of P1, because pyrene content is quite low, it shows no oxidation current peak. But in P2 and P3, the higher pyrene content leads to the enhanced HOMO level. In B series, there are no obvious differences in the LUMO level, probably due to the small difference among their BT contents. No regularity in PB series, and we contribute it to the small content of pyrene and BT.

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