利用ATRP聚合法合成雙棲性共聚高分子與單層奈米碳管的化學改質

Synthesis of Amphilic Diblock Coplolymers via Living Polymerization and Single Walled Carbon Nanotubes Composites through Chemical Functionalization

李俊德(Jun-De Li)

指導教授 ： 張淑美

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2006年)

摘要

本論文主要分為兩部分作為研究與探討。第一部份係運用原子轉移自由基聚合法（Atom Transfer Radical Polymerization，ATRP）聚合雙區塊共聚物。原子轉移自由基聚合 (ATRP)，是有別於傳統自由基聚合的一種新型態自由基聚合反應，對於乙烯系的單體如：苯乙烯、丙烯酸酯之衍生物…等等，都有非常好的聚合效果。本實驗利用此優點進行親油性大分子PMMA-Br作為起始劑與親水性單體如多甘醇丙烯酸甲酯（三種不同EO鏈長之單體，OEGMA475、OEGMA1100、OEGMA2080）之共聚合，共聚出不同鏈長EO的雙區塊共聚物。最後我們利用合成出的PMMA-b-POEGMA1100共聚物與鋰鹽LiN(CF3SO2)2，製備出([EO]/Li=20/1)的固態高分子電解質膜，其室溫導電度為(6.66×10-5 Scm-1)，且當溫度提升至50℃時，導電度可提升至(1.43×10-4 Scm-1)。
第二部份主要在於單層奈米碳管( SWNTs )的化學改質，因一般奈米碳管容易產生團聚現象，以至於造成應用上的困難，故可藉由PEGME接枝，使奈米碳管可以適當的溶解，均勻分散在一些常用的溶劑裡面，而不至於快速的產生聚集、沉澱與糾結。實驗方法為利用強酸將碳管切割、蝕刻、氧化成含末端酸基之短碳管，再行接枝反應，接上不同鏈長的Poly-(ethylene glycol) methyl ether (MW：350，2000)取代基，進而探討改質後的碳管對溶劑之溶解程度及特性。實驗結果證明確實有效的使單層奈米碳管能夠在適當的含量裡溶解在一些常用的溶劑裡。

關鍵字

原子轉移自由基聚合法 ； 塊狀共聚合物 ； 固態高分子電解質 ； 奈米碳管

並列摘要

We separate this paper into two parts to discuss. The first part is a series of well-defined hydrophobic-hydrophilic diblock have been synthesized in high yield under environmentally friendly conditions via atom transfer radical polymerization (ATRP). Atom transfer radical polymerization (ATRP) has been show to be a versatile technique for the controlled polymerization of many monomer classes, including styrene, acrylates, methacrylates and derivatives. The hydrophilic block is based on methoxy-capped oligo(ethylene glycol) methacrylate (OEGMA, mean degree of polymerization is OEGMA475, OEGMA1100, OEGMA2080) and the hydrophobic component is PMMA block. Then, polymerized different EO-length diblock copolymer. Finally, we make use of the diblock copolymer PMMA-b-POEGMA1100 with LiN(SO2CF3)2 salts To product solid polymer electrolyte ([EO]/Li=20/1) which conductivity at room temperature was 6.66×10-5 Scm-1 when arising the temperature to 50℃, the conductivity achieved 1.43×10-4 Scm-1 .
Then, the second part focus on chemically modified single-walled nanotubes (SWNTs). Because that nanotubes are prone to reunion phenomenon, that results in the difficult in application. The PEGME-grafted SWNTs can dissolve appropriately, and mixed well in usual solvent. The experiment uses strong acid oxidative cutting and etching to form a shortened sing-walled carbon nanotubes. After grafting different EO-length PEGME, we use them to perform a series of experiment.

並列關鍵字

Atom Transfer Radical Polymerization ； diblock copolymer ； solid polymer electrolyte ； nanotubes

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