Xuyen Nguyen Thi, Ra Eun Ju, Geng Hong-Zhang, Kim Ki Kang, An Kay Hyeok, Lee Young Hee
Department of Nanoscience and Nanotechnology, Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon, 440-746, South Korea.
J Phys Chem B. 2007 Oct 4;111(39):11350-3. doi: 10.1021/jp075541q. Epub 2007 Sep 13.
Oxydianiline-pyromellitic dianhydride poly(amic acid) (ODA-PMDA PAA) was polymerized with a catalyst support of triethyl amine for controlling molecular weight. This polymer was used for electrospinning in the preparation of PAA nanofibers, a precursor of carbon nanofibers. Here the amount of catalyst and concentration of PAA solution were optimized to produce polyimide-based carbon nanofibers approximately 80 nm in diameter. The effects of molecular weight of PAA, bias voltage, and spinning rate on the morphology of electrospun PAA and polyimide nanofibers have been evaluated. We showed that the conductivity of the carbon nanofiber mat decreased with increasing nanofiber diameter, where the conductivity of polyimide-based carbon nanofiber mat was much higher than those of other types of carbon nanofiber mat. The key ingredient to increase conductivity in a carbon nanofiber mat was found to be the number of cross junctions between nanofibers.
氧化二苯胺-均苯四甲酸二酐聚（酰胺酸）（ODA-PMDA PAA）在三乙胺催化剂载体作用下聚合以控制分子量。该聚合物用于静电纺丝以制备PAA纳米纤维，即碳纳米纤维的前驱体。在此，对催化剂用量和PAA溶液浓度进行了优化，以制备直径约80nm的聚酰亚胺基碳纳米纤维。评估了PAA分子量、偏置电压和纺丝速率对静电纺PAA和聚酰亚胺纳米纤维形态的影响。我们发现，碳纳米纤维毡的电导率随纳米纤维直径的增加而降低，其中聚酰亚胺基碳纳米纤维毡的电导率远高于其他类型的碳纳米纤维毡。发现增加碳纳米纤维毡电导率的关键因素是纳米纤维之间的交叉连接数。
