期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 68, 期 3-4, 页码 933-943出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2007.08.019
关键词
nanocomposites; carbon nanoparticles; mechanical properties; thermal properties; Raman spectroscopy
Carbon nanoparticles (CN), synthesized by a shock wave propagation method from the free carbon of the explosive, were dispersed in isotactic polypropylene (iPP) using a twin screw co-rotating extruder. These materials were analyzed for their tensile Properties, crystallization morphology, thermal stability under N-2, O-2 and air, as well as their permeability rates for N-2, O-2 and CO2-Young's modulus was significantly enhanced, as was the tensile strength at the yield point, although at a smaller extent. However, the tensile strength and elongation at the break point slightly deteriorated with the increase of the Filler's concentration. This behaviour was attributed to the increase tendency of CN to form aggregates into iPP matrix by increasing its content. The size of aggregates, as was evaluated by extended micro-Raman mapping, is ranged from 1 up to 5 mu m. The nanoparticles caused a significant reduction of the iPP chain's mobility leading to smaller and less ordered crystallites, with the appearance of gamma-phase crystallites at CN content 5 wt.%. In inert atmosphere (N-2) the presence of the nanoparticles caused a shift of the starting decomposition temperature (T-d), from 368 up to 418.6 degrees C, while, under oxygen, thermal decomposition was more complex, displaying more than two stages. The Td was slightly lowered, up to a filler content of 2.5 wt.%, with the nanoparticles exhibiting a catalytic role at the beginning of the polymer's decomposition. Under air, the degradation behaviour was between those exhibited in inert and O-2 atmospheres. Permeability rates for the gases measured were substantially lowered with increasing filler content. (c) 2007 Elsevier Ltd. All rights reserved.
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