期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 11, 页码 6125-6138出版社
AMER CHEMICAL SOC
DOI: 10.1021/am5082183
关键词
polypropylene nanocomposites; percolation value; crystal phases; viscosity; band gap; negative permittivity
资金
- National Science Foundation [CMMI 10-30755]
- American Chemical Society Petroleum Research Fund (ACS PRF) [53930-ND6]
- Welch Foundation [V-0004]
Polypropylene (PP)/carbon nanotubes (CNTs) nanocomposites were prepared by coating CNTs on the surface of gelated/swollen soft PP pellets. The electrical conductivity (sigma) studies revealed a percolation threshold of only 0.3 wt %, and the electrical conductivity mechanism followed a 3-d variable range hopping (VRH) behavior. At lower processing temperature, the CNTs formed the network structure more easily, resulting in a higher sigma. The fraction of gamma-phase PP increased with increasing the pressing ternperature. The CNTs at lower loading (0.1 wt %) served as nucleating sites and promoted the crystallization of PP. The CNTs favored the disentanglement of polymer chains and thus caused an even lower melt viscosity of nanocomposites than that of pure PP. The calculated optical band gap of CNTs was observed to increase with increasing the processing temperature, i.e., 1.55 eV for nanocomposites prepared at 120 degrees C and 1.70 eV prepared at 160 and 180 degrees C. Both the Drude model and interband transition phenomenon have been used for theoretical analysis of the real permittivity of the nanocomposites.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据