The Ultraviolet-Induced Functionalization of Multi-Walled Carbon Nanotubes with Polymer Radicals Generated from Polyvinyl Benzoate Derivatives
The Ultraviolet-Induced Functionalization of Multi-Walled Carbon Nanotubes with Polymer Radicals Generated from Polyvinyl Benzoate Derivatives
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DOI：
10.3390/c3030028
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发表时间：
2017-09
期刊：
影响因子：
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通讯作者：
Tomoya Takada;Y. Nishioka;T. Baba
中科院分区：
文献类型：
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作者：
Tomoya Takada;Y. Nishioka;T. Baba
为了开发一种新的技术用于制造包含聚合物和纳米碳的杂化材料，我们研究了用通过光解4-（氯甲基）苯甲酸酯部分产生的苄基型聚合物侧链自由基对原始多壁碳纳米管（MWCNTs）的表面改性。以聚乙烯醇（PVA）为原料，与相应的酰氯进行酯化反应，合成了侧链含4-氯甲基苯甲酸酯的聚合物。将合成的聚合物和多壁碳纳米管混合在N-甲基吡咯烷酮中，并用紫外（UV）光照射。通过X射线光电子能谱（XPS）和拉曼光谱观察了聚合物和多壁碳纳米管的结构变化。XPS结果表明，氯甲基的C-Cl键发生断裂，形成苄基型自由基。通过拉曼光谱分析证实了紫外光辐照引起的碳纳米管表面缺陷的增加。这些结果支持聚合物侧链和MWCNT侧壁之间通过自由基加成反应形成共价键。并对所制备材料的光热转换特性进行了评价。
In order to develop a novel technique for the fabrication of hybrid materials containing polymers and nanocarbons, we examined the surface modification of pristine multi-walled carbon nanotubes (MWCNTs) with benzyl-type polymer side chain radicals generated through photolysis of 4-(chloromethyl)benzoate moieties. The polymer with a 4-(chloromethyl)benzoate side chain was prepared by the esterification of polyvinyl alcohol (PVA) with corresponding acid chloride. The synthesized polymer and MWCNTs were mixed in N-methylpyrrolidone and irradiated with ultraviolet (UV) light. Structural changes of the polymer and MWCNTs were observed by means of X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The XPS results revealed that scission of the C–Cl bonds of the chloromethyl groups and benzyl-type radical formation occurred. The incremental surface defects of the MWCNTs caused by UV irradiation were confirmed by means of Raman spectroscopy. These results support the covalent bond formation between the polymer side chain and MWCNT sidewalls by radical addition reaction. The photothermal conversion characteristics of the prepared materials were also evaluated.