Zhang Donghui, Kandadai Madhuvanthi A, Cech Jiri, Roth Siegmar, Curran Seamus A
New Mexico State University, Department of Physics, Las Cruces, New Mexico 88003-8001, USA.
J Phys Chem B. 2006 Jul 6;110(26):12910-5. doi: 10.1021/jp061628k.
Much effort has been directed at the fabrication of carbon nanotubes (CNTs)/polymer composites and the characterization of their physical properties. Among them, composites comprising CNTs and the biocompatible polymers are of special interest due to their potential for specific biomedical applications. we report the preparation of the MWCNT/poly(L-lactide) composite and the corresponding spectroscopic (Raman) and the microscopic (SEM, TEM) characterization. The electronic transport, thermal properties, and biocompatibility of this composite have also been investigated. The Raman spectroscopic analysis suggests the interaction between PLLA and MWCNT occurs mainly through the hydrophobic C-CH3 functional groups. The DC conductivity of the composite increases as the MWCNT loading is increased. Such behavior can be described by a percolation mechanism in which a percolation threshold at about 14 wt % MWCNT loading is observed with the maximum end conductivity of 0.1 S x cm(-1). The DSC study of the PLLA/MWCNT composite reveals that the MWCNTs in the composite have the effect of inducing crystallization and plasticizing the polymer matrix. The results from the cell culture test suggest that the presence of MWCNT in the composite inhibits the growth of the fibroblast cells.
人们在碳纳米管（CNTs）/聚合物复合材料的制备及其物理性质的表征方面付出了很多努力。其中，由碳纳米管和生物相容性聚合物组成的复合材料因其在特定生物医学应用中的潜力而备受关注。我们报道了多壁碳纳米管/聚（L-丙交酯）复合材料的制备以及相应的光谱（拉曼）和微观（扫描电子显微镜、透射电子显微镜）表征。还研究了该复合材料的电子传输、热性能和生物相容性。拉曼光谱分析表明，聚乳酸（PLLA）和多壁碳纳米管之间的相互作用主要通过疏水的C-CH₃官能团发生。随着多壁碳纳米管负载量的增加，复合材料的直流电导率增加。这种行为可以用渗流机制来描述，其中在多壁碳纳米管负载量约为14 wt%时观察到渗流阈值，最大电导率为0.1 S·cm⁻¹（0.1西门子每厘米）。聚乳酸/多壁碳纳米管复合材料的差示扫描量热法（DSC）研究表明，复合材料中的多壁碳纳米管具有诱导结晶和使聚合物基体增塑的作用效果。细胞培养测试结果表明，复合材料中多壁碳纳米管的存在会抑制成纤维细胞的生长。
