Inclusion of fullerene in polymer chains grafted on silica nanoparticles in an organic solvent
Inclusion of fullerene in polymer chains grafted on silica nanoparticles in an organic solvent
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有机溶剂中接枝在二氧化硅纳米颗粒上的聚合物链中包含富勒烯
DOI：
10.1038/pj.2014.24
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发表时间：
2014
期刊：
影响因子：
2.8
通讯作者：
Suguru Motokucho and Ken Kojio
中科院分区：
文献类型：
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作者：
Kohji Yoshinaga;Yin Yang;Teruhisa Ohno;Suguru Motokucho and Ken Kojio
富勒烯由于具有吸放电子、高折射率、高热导率和紫外吸收等特性，在智能材料和功能材料方面有着广泛的应用前景。到目前为止，许多论文报道了在太阳能电池器件、填料和半导体等应用中使用改性或未改性富勒烯的基础和实践研究。1-4在大多数情况下，进行富勒烯的表面改性以促进分散或增加富勒烯在溶液中的溶解度。5然而，通过共价键进行的表面修饰有时会破坏富勒烯的固有性质。此外，表面活性剂的添加导致富勒烯从最终产品中泄漏并污染环境。在这方面，在我们以前的研究中，我们表明，聚合物分散剂，聚（甲基丙烯酸甲酯-co-2-萘基甲基丙烯酸酯）（聚（MMA-NMA）），有效地分散在有机溶剂中的富勒烯，而不破坏富勒烯的原始性能。6二氧化硅因其无毒、稳定、易得而被广泛用作涂料、塑料填料、催化剂载体、多相有机合成载体和色谱固定相等领域的原料。胶体化学的最新发展也使得控制胶体无机颗粒的尺寸从纳米到微米尺寸成为可能。7纳米级胶体二氧化硅是一种特别有吸引力的材料，因为它是球形的，无色的，在水溶液中稳定性高。含有20 nm胶体二氧化硅的水溶液通常是透明的。因此，由相当良好分散的富勒烯和二氧化硅纳米颗粒组成的聚合物复合材料可以导致制造独特的功能材料，即二氧化硅增强的导热透明复合材料。本论文在四氢呋喃（THF）溶液中，将富勒烯（C60）引入到直径为12 nm的SiO2颗粒上接枝的聚（MMA-NMA）链中，并在不形成C60团簇的情况下，制备了C60与聚（MMA-NMA）接枝SiO2复合的透明杂化膜。6中，聚（MMA-NMA）与MMA/NMA的摩尔比为1/6至1/15，数均分子量（Mn）约为1/410000时，作为C60在甲基丙烯酸甲酯（MMA）中的分散剂是有效的;因此，接枝共聚物以1/7至1/14的摩尔比使用。
Fullerene has received much interest for applications in smart and functional materials owing to its characteristic properties, such as electron-accepting or-releasing capacity, high refractive index, high heat conductivity and absorption in the UV region. So far, a number of papers have reported fundamental and practical studies employing modified or unmodified fullerenes in applications such as solar cell devices, fillers and semiconductors. 1–4 In most cases, a surface modification of fullerenes was performed to promote dispersion or to increase the solubility of the fullerenes in solution. 5 However, surface modification by a covalent bond sometimes spoils the innate properties of fullerene. Furthermore, the addition of surfactants causes fullerene to leak from the final products and contaminate the environment. In this regard, in our previous study we showed that a polymer dispersant, poly (methyl methacrylate-co-2-naphthyl methacrylate)(poly (MMA-NMA)), effectively disperses fullerene in an organic solvent without spoiling the original properties of fullerene. 6 Silica is widely used as a raw material in many applications, including paints, fillers of plastics, carriers of catalysts, supports in heterogeneous organic synthesis and stationary phase of chromatography, owing to its nontoxicity, stability and availability. A recent development in colloid chemistry also made it possible to control the size of the colloidal inorganic particles ranging from nanometer to micrometer size. 7 Nanometer-sized colloidal silica is an especially attractive material owing to its spherical shape, colorlessness and high stability in an aqueous solution. An aqueous solution containing colloidal silica o20nm is usually transparent. Therefore, polymer composites consisting of fairly well-dispersed fullerene and silica nanoparticles can result in the fabrication of unique functional materials, that is, silica-reinforced and heat-conductive transparent composites. In this study, the inclusion of fullerene (C60) into poly (MMA-NMA) chains grafted on silica particles 12nm in diameter in tetrahydrofuran (THF) without formation of C60 clusters and fabrication of transparent hybrid films composed of C60 and poly (MMA-NMA)-grafted silica composite were investigated.According to our previous study, 6 the poly (MMA-NMA) s to MMA/NMA mole ratio of 1/6 to 1/15, and around number average molecular weight (Mn) ¼ 10000 was effective as a dispersant of C60 in methyl methacrylate (MMA); therefore, the grafting copolymers were employed at a mole ratio ranging from 1/7 to 1/14.