聚丙烯/碳纳米管微层挤出材料结构与性能
Structure and Properties of Carbon Nanotubes Filled Polypropylene Composites via Microlayered Extrusion
李姜 1文明 1李家丽 1孙小杰 1郭少云1
作者信息
- 1. 四川大学高分子研究所,成都,610065
- 折叠
摘要
采用实验室自制的微层共挤出设备,通过不同数目的分层叠加单元,制备了1～128层多壁碳纳米管(WM-NTs)填充聚丙烯复合材料.SEM结果表明,WMNTs经过数个分层叠加单元后,能够沿着挤出方向取向、有序排列.PLM测试发现,128层样品在等温结晶初始阶段出现了明显的纤维状亮条而不是传统的球形状亮点.DSC证明,WM-NTs具有很强的异相成核作用,微层挤出样品的结晶尺寸分布比1层样品更宽.微层挤出技术不需要以牺牲材料韧性为代价以达到增强的目的.所制得复合体系的断裂伸长率与拉伸强度均随着层数增加而提高.
Abstract
In order to optimize the dispersion of the multiwalled carbon nanotubes (WMNTs) filled polymer composites, Microlayered WMNTs filled polypropylene composites were prepared via the microlayered extrusion system designed in our lab. SEM results show the dispersion of WMNTs can be improved by the microlayered extrusion technology. WMNTs oriented in their length axis along the flow direction via the multiplying dements. PLM indicates that some bright wisps can be found in the composites with 128 L in instead of the bright points in conventional samples because of the orientation of the WMNTs. results proves WMNTs has strong heterogeneous nucleated effects. Meanwhile, the microlayered composites have wider crystalIite size distribution. Furthermore, for most WMNTs filled polymer composites, the increases in tensile strength are on sacrifice of toughness, due to embritdement. However, the microlayered samples could improve elongation at break as well as tensile strength, which could not be achieved by conventional technology.
关键词
聚丙烯/碳纳米管/取向/微层挤出/结晶Key words
polypropylene/carbon nanotubes/orientation/microlayered extrusion/crystallization引用本文复制引用
基金项目
国家自然科学基金(50603016)
国家自然科学基金(50773047)
出版年
2009
NETL
NSTL
维普
万方数据