孔结构对热解酚醛树脂制备碳纳米管的影响

发布时间：2018-03-31 00:28

本文选题：碳纳米管　切入点：孔结构　出处：《硅酸盐学报》2017年03期

【摘要】：以不同的酚醛树脂为原料经催化热解法制备碳纳米管时结果差异较大,为阐明存在的问题及原因,以酚醛树脂为碳源、硝酸铁为催化剂前驱体,通过催化酚醛树脂裂解的方法制备碳纳米管,研究了酚醛树脂中孔结构对合成碳纳米管的影响。采用X射线衍射、扫描电子显微镜和透射电子显微镜对酚醛树脂热解产物的物相组成及显微结构进行了分析。结果表明:1)碳纳米管仅生长在固化后酚醛树脂的大气孔(50~1 000μm)中,其直径约为40~100纳米,长度可达几百微米,其它位置基本无碳纳米管的生成;2)较大的气孔(50~1 000μm)可为碳纳米管的生长提供相对充足的碳源和生长空间,继而有利于碳纳米管的生成;3)较小的气孔(30μm以下)由于难以满足该条件而基本无碳纳米管的生成。碳纳米管的产率与酚醛树脂固化后形成气孔的大小有关,采用固化后能形成较大孔径的酚醛树脂为碳源可以提高碳纳米管的产率。
[Abstract]:The results of preparing carbon nanotubes by catalytic pyrolysis of different phenolic resins were quite different. In order to clarify the existing problems and reasons, the phenolic resin was used as carbon source and iron nitrate as catalyst precursor. Carbon nanotubes (CNTs) were prepared by catalytic pyrolysis of phenolic resin. The effect of mesoporous structure of phenolic resin on the synthesis of CNTs was studied. The phase composition and microstructure of the pyrolytic products of phenolic resin were analyzed by scanning electron microscope and transmission electron microscope. The results showed that the carbon nanotubes grew only in the large porosity of phenolic resin 50000 渭 m after curing, and the diameter of the nanotubes was about 40 ~ 100 nm. The length of carbon nanotubes can be up to several hundred microns, and the formation of carbon nanotubes in other locations is basically free of carbon nanotubes. The larger stomata 50000 渭 m) can provide relatively sufficient carbon sources and growth space for the growth of carbon nanotubes. Therefore, the formation of carbon nanotubes is favorable to the formation of carbon nanotubes (< 30 渭 m). The yield of carbon nanotubes is related to the size of pores formed by phenolic resin curing. The yield of carbon nanotubes can be improved by using phenolic resin with large pore size as carbon source after curing.
【作者单位】：武汉科技大学省部共建耐火材料与冶金国家重点实验室;
【基金】：国家自然科学基金面上项目(51272188,51472184,51472185) 湖北省自然科学基金项目(2013CFA086) 国家“973”计划前期研究专项(2014CB660802) 湖北省科技支撑计划对外科技合作项目(2013BHE002)
【分类号】：TQ127.11;TB383.1

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