Selective sequestering of multi-walled carbon nanotubes in self-assembled block copolymer
Selective sequestering of multi-walled carbon nanotubes in self-assembled block copolymer
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DOI：
10.1016/j.snb.2006.12.045
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发表时间：
2007-09
影响因子：
8.4
通讯作者：
I. Park;Wonmok Lee;Junkyung Kim;P. Min;Hyunjung Lee
中科院分区：
文献类型：
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作者：
I. Park;Wonmok Lee;Junkyung Kim;P. Min;Hyunjung Lee
嵌段共聚物（BCP）通过其独特的微相分离可以自组装成各种纳米结构。软材料如嵌段共聚物在螯合功能材料（如纳米颗粒和生物材料）中的作用旨在模板化纳米结构以实现其期望的功能。根据BCP中包含的功能元件，已经提出了各种应用，例如机械增强材料或生物传感器或波导光子材料。虽然大多数纳米元件在形状上是各向同性的（即球形），但碳纳米管（CNTs）表现出高纵横比。典型的CNT具有几nm的直径和几μm的长度。碳纳米管一般具有上级导电性和机械强度，因此其与软质材料复合可以形成柔性显示面板或电子纸的平台材料。在这项研究中，我们展示了原位功能化的多壁碳纳米管（MWNT）与聚合物通过乳液聚合。在含有苯乙烯单体、非离子表面活性剂和阳离子偶联剂（[2-（甲基丙烯酰氧基）乙基]三甲基氯化铵，MATMAC）的水溶液中制备了聚苯乙烯功能化的MWNT，并通过将它们溶解在甲苯中超过72 h制备了PS功能化的MWNT。因此，它增加了纳米管的溶解性和分散性，即使具有低程度的官能化。以聚苯乙烯-b-异戊二烯（400 k-360 k，PS-b-PI）为结构导向材料，对PS功能化MWNTs进行了有序化。这种方法可以有效地控制碳纳米管的取向和空间分布，有助于制备碳纳米管嵌入的纳米功能材料。
Block copolymer (BCP) can self-assemble into various nanostructures thorough their unique microphase separation. The role of soft materials such as block copolymers in sequestering the functional materials (as nanoparticles and biomaterials) aims at templating the nanostructure to achieve its desirable function. Depending on functional elements incorporated in BCP, various applications have been proposed such as the mechanically reinforced materials or biosensors or wave-guiding photonic materials. While most of nano-elements are isotropic in shape (i.e. sphere), the carbon nanotubes (CNTs) exhibit the high aspect ratio. A typical CNT has the diameter of several nm and the length of a few μm. CNTs generally have a superior electrical conductivity and mechanical strength, thus its composite with soft materials can form a platform material for flexible display panel or e-paper. In this study, we demonstrated in situ functionalization of multi-walled carbon nanotube (MWNT) with polymer via emulsion polymerization. Polystyrene-functionalized MWNT was prepared in an aqueous solution containing styrene monomer, non-ionic surfactant and the cationic coupling agent ([2-(methacryloyloxy)ethyl]trimethylammonium chloride, MATMAC) and produced PS-functionalized MWNTs by dissolving them in toluene over 72h. Consequently, it increased the solubility and the dispersion of nanotubes even with a low degree of functionalization. A lamellar forming polystyrene-b-isoprene (400k-360k, PS-b-PI) was used as the structure-guiding materials in ordering the PS-functionalized MWNTs anisotropically in PS domain. This method might contribute to the fabrication of CNT-embedded nanofunctional materials by controlling the orientation and the spatial distribution very effectively.