González-Domínguez J M, Castell P, Ansón A, Maser W K, Benito A M, Martinez M T
Instituto de Carboquímica (CSIC), C/Miguel Luesma Castán 4, E-50018 Zaragoza, Spain.
J Nanosci Nanotechnol. 2009 Oct;9(10):6104-12. doi: 10.1166/jnn.2009.1575.
Arc discharge single walled carbon nanotubes were processed by acid treatment, dispersion in a Pluronic F68 block copolymer aqueous solution and centrifugation. The as-prepared material was characterized by transmission electron microscopy, X-ray diffraction and Raman spectroscopy, showing an important degree of debundling as well as the removal of most of the graphitic and metallic impurities from pristine nanotubes. The nanotube-Pluronic material was integrated into an advanced trifunctional epoxy resin, triglycidyl p-aminophenol, using 4,4'-diaminodiphenylsulfone as the curing agent. The material was incorporated into the epoxy system (0.1, 0.25, 0.50, 1.0, 2.0 wt%) throughout hot magnetic stirring and ultrasonication. Curing kinetics was studied using differential scanning calorimetry, applying the Vyazovkin's isoconversional method. In the early stages of curing, the kinetic study revealed a decrease in the activation energy for samples containing Pluronic, suggesting that Pluronic induced an improvement in the mobility of reactants. The cured composites were characterized by Raman spectroscopy, thermogravimetric analysis and scanning electron microscopy. Micrographs revealed successful integration and homogeneous distribution of the nanotube-Pluronic material in the epoxy matrix, while direct integration of bare nanotubes originated aggregates and inhomogeneity.
电弧放电单壁碳纳米管经过酸处理、分散于普朗尼克F68嵌段共聚物水溶液中并离心处理。所制备的材料通过透射电子显微镜、X射线衍射和拉曼光谱进行表征，结果表明其解束程度显著，并且从原始纳米管中去除了大部分石墨和金属杂质。使用4,4'-二氨基二苯砜作为固化剂，将纳米管-普朗尼克材料整合到一种先进的三官能环氧树脂（对氨基苯酚三缩水甘油酯）中。通过热磁搅拌和超声处理，将该材料以不同比例（0.1、0.25、0.50、1.0、2.0 wt%）加入到环氧体系中。采用差示扫描量热法并应用维亚佐夫金等转化率方法研究固化动力学。在固化初期，动力学研究表明含有普朗尼克的样品的活化能降低，这表明普朗尼克提高了反应物的迁移率。通过拉曼光谱、热重分析和扫描电子显微镜对固化后的复合材料进行表征。显微照片显示纳米管-普朗尼克材料成功地整合到环氧基质中且分布均匀，而直接加入裸纳米管则会产生团聚和不均匀性。
