文献类型：期刊文献

英文题名：Multiwalled carbon nanotubes covalently functionalized with poly(N-vinylcarbazole) via RAFT polymerization: synthesis and imonliner optical properties

作者：Zhang, Bin[1]; Wang, Jun[2]; Chen, Y.U.[1]; Fruchtl, Daniel[2]; Yu, Bo[1]; Zhuang, Xiaodong[1]; He, Nan[1]; Blau, Werner J.[2]

机构：[1] Key Lab for Advanced Materials, Institute of Applied Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China; [2] School of Physics, Centre for Research on Adaptative Nanostructures and Nanodevices [CRANN], Trinity College Dublin, Dublin 2, Ireland

年份：2010

卷号：48

期号：14

起止页码：3161

外文期刊名：Journal of Polymer Science, Part A: Polymer Chemistry

收录：EI(收录号：20102613034724)

语种：英文

外文关键词：Yarn - Hybrid materials - Free radical polymerization - Multiwalled carbon nanotubes (MWCN) - Organic solvents - Living polymerization - Absorption spectroscopy - Chlorine compounds - Optical properties

摘要：The poly(N-vinylcarbazole)-grafted MWNTs (MWNTPVK) hybrid materials were synthesized in the presence of S-1-Dodecyl-S′-(α, α′-dimethyl-α″-acetic acid) trithiocarbonate ( DDAT)-covalently functionalized multiwalled carbon nanotubes (MWNTDDAT) as reversible addition-fragmentation chain transfer (RAFT) agent. Incorporation of the PVK moieties onto the MWNTs surface can considerably improve the solubility and processability of MWNTs. For all MWNT-PVK hybrid materials, they are soluble in some common organic solvents such as toluene, THF, chloroform, DMF and others. In contrast to the UV/Vis spectrum of DDAT-PVK, which was synthesized by use of DDAT as RAFT agent under the same synthetic condition, in the visible region, the absorption spectrum of MWNT-PVK exhibited a typical electronic absorption characteristics of solubillzed carbon nanotubes, in which the ab-sorbance decreases gradually in the range of 350-600 nm. At the same level of linear transmission the MWNT-PVK with 79.2% PVK moieties in the material structure possesses best optical limiting performance in comparison with the other MWNT-PVK composites, MWNTs and C60. The significant NLO responses manifest the MWNT-PVK materials suitable candidate for viable optical limiting devices. Light scattering, originating from the thermalinduced microplasmas and/or microbubbles, is responsible for the optical limiting. ? 2010 Wiley Periodicals, Inc.