Acid‐modified carbon nanotubes distribution and mechanical enhancement in polystyrene/elastomer blends
Acid‐modified carbon nanotubes distribution and mechanical enhancement in polystyrene/elastomer blends
复制标题
DOI：
10.1002/pen.22163
复制
发表时间：
2012-05
影响因子：
3.2
通讯作者：
Xi Fan;Zhicheng Wang;Ke Wang;H. Deng;Feng Chen;Q. Fu
中科院分区：
文献类型：
--
作者：
Xi Fan;Zhicheng Wang;Ke Wang;H. Deng;Feng Chen;Q. Fu
碳纳米管的引入有望成为聚合物共混物力学性能定制的有效途径。本文将酸改性的多壁碳纳米管（A-MWCNTs）引入到聚苯乙烯/马来酸酐-g-（苯乙烯-乙烯-丁二烯-苯乙烯）（PS/SEBS-MA）共混体系中。通过改变PS/SEBS-MA的质量比（80/20 ~ 60/40），共混物的两相结构由海岛型转变为准共连续结构，表现出不同的力学性能。在80/20质量比范围内，随着A-MWCNTs含量的增加，复合材料的冲击强度提高，拉伸强度基本不变;而在60/40质量比范围内，复合材料具有同时增韧和增强的效果。通过扫描电子显微镜、偏光显微镜、动态力学分析和流变性能测试等手段研究了A-MWCNTs在共混物中的分布。结果表明，当纳米管负载量从0增加到3wt%时，由于SEBS-MA的含量较低，A-MWCNTs在80/20质量比下会逐渐迁移到连续的PS相中;而在60/40质量比下，由于SEBS-MA的含量较高，A-MWCNTs在整个负载量范围内都被填充在SEBS-MA区域。该研究为高性能三元聚合物/弹性体/无机填料复合材料的设计和制备提供了指导。Polym.工程科学，2012.© 2011年塑料工程师协会
The incorporation of carbon nanotubes (CNTs) is expected as an effective path for tailoring mechanical properties of polymer blends. In this study, acid-modified multiwalled CNTs (A-MWCNTs) were introduced into polystyrene/maleic anhydride-g-(styrene-ethylene-butadiene-styrene) (PS/SEBS-MA) blends. By altering the mass ratio of PS/SEBS-MA from 80/20 to 60/40, the biphase structure of blend was changed from sea-island-like type to quasi co-continuous structure, of different mechanical behaviors. In 80/20 mass ratio, the impact strength was improved while the tensile strength was unchanged with increasing A-MWCNTs content, whereas a simultaneously toughening and strengthening effect was achieved for the compound with 60/40 mass ratio. Scanning electron microscopy, polarized light microscopy, dynamic mechanical analysis, and rheological measurements were carried out to detect the distribution of A-MWCNTs in the blends. The results demonstrated as increasing the nanotube loading from 0 to 3 wt%, A-MWCNTs might gradually migrate into continuous PS phase in 80/20 mass ratio, due to the low content of SEBS-MA, while they were totally packed in SEBS-MA region within the entire loading range used in 60/40 mass ratio due to its high content of SEBS-MA. This study provides guidance on the design and preparation of high performance ternary polymer/elastomer/inorganic filler composites. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers