聚碳酸酯修饰多壁碳纳米管的制备和表征

为了制备聚合物/碳纳米管复合物，采用聚碳酸酯修饰了多壁碳纳米管。选择聚碳酸环氧丙烷己内酯，聚碳酸亚丁酯己内酯和聚碳酸亚丙酯马来酸酐酯三种聚碳酸酯修饰多壁碳纳米管，仅仅碳酸环氧丙烷己内酯修饰的碳纳米管复合物可分离得到可溶解性产物。分别采用红外光谱、扫描电镜和透射电镜表征了碳纳米管的表面修饰基团及形貌。热重分析表明，可溶解聚碳酸环氧丙烷己内酯修饰多壁碳纳米管相对接枝了较多的聚合物，因此促进了碳纳米管的溶解性，可能是因为聚碳酸环氧丙烷己内酯具有较多的端羟基提高了修饰接枝效果。可溶解聚碳酸环氧丙烷己内酯修饰多壁碳纳米管接枝了生物活性的部分，并具有一定溶解性，在药物载体领域将具有潜在用途。

Preparation and Characterization of Polycarbonate Modified Multiple‐walled Carbon Nanotubes

To prepare polymer/carbon nanotube composites, polycarbonate was chosen to modify multiple‐walled carbon nanotubes. Poly[(propylene oxide)‐(carbon dioxide)‐(ε‐caprolactone)], poly(butylene‐co‐ε‐caprolactone carbonate), and poly[(propylene oxide)‐co‐(carbon dioxide)‐co‐(maleic anhydride)] were the polycarbonates which were used to modify multiple‐walled carbon nanotubes, but only soluble poly[(propylene oxide)‐(carbon dioxide)‐(ε‐caprolactone)] modified multiple‐walled carbon nanotubes could be obtained. Thermogravimetric analysis clearly indicated that more polycarbonates were attached to soluble poly[(propylene oxide)‐(carbon dioxide)‐(ε‐caprolactone)] modified multiple‐walled carbon nanotubes. The formation of surface functional groups and changes of nanotube structures and morphology were monitored by infrared spectroscopy, scanning electron microscopy and transmission electron microscopy, respectively. Because of their solubility and bioactive moieties, poly[(propylene oxide)‐(carbon dioxide)‐(ε‐caprolactone)] modified multiple‐walled carbon nanotubes may find their potential use in drug delivery.