A general strategy for highly efficient nanoparticle dispersing agents based on hybrid dendritic linear block copolymers |
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| Authors: | Robert Vestberg Ashley M Piekarski Eric D Pressly Kim Y Van Berkel Michael Malkoch Jeffrey Gerbac Nobuhiko Ueno Craig J Hawker |
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| Institution: | 1. Materials Research Laboratory, University of California, Santa Barbara, California 93106;2. Mitsubishi Chemical Center for Advanced Materials, University of California, Santa Barbara, California 93106;3. Mitsubshi Chemical Research and Innovation Center, 601 Pine Avenue, Suite C, Goleta, California 93117;4. Mitsubshi Chemical Research Center, 1000 Kamoshida‐Cho, Aoba‐Ku, Yokohama 227‐8502, Japan |
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| Abstract: | A modular approach to the synthesis of a library of hybrid dendritic‐linear copolymers was developed based on RAFT polymerization from monodisperse dendritic macroRAFT agents. By accurately controlling the molecular weight of the linear block, generation number of the dendrimer and the nature of the dendritic chains ends, the performance of these hybrid block copolymers as dispersing agents was optimized for a range of nanoparticles. For titanium dioxide nanoparticles, dispersion in a poly(methyl methacrylate) matrix was maximized with a second generation dendrimer containing four carboxylic acid end groups, and the quality of dispersion was observed to be superior to commercial dispersing agents for TiO2. This approach also allowed novel hybrid dendritic‐linear dispersing agents to be prepared for the dispersion of Au and CdSe nanoparticles based on disulphide and phosphine oxide end groups, respectively. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 1237–1258, 2009 |
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| Keywords: | block copolymers dendrimers dispersions surfaces |
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