By a News Reporter-Staff News Editor at Science Letter -- New research on Styrenes is the subject of a report. According to news reporting originating from Shanghai, People's Republic of China, by NewsRx correspondents, research stated, "Three-dimensional (3D) morphology of hierarchically self-assembled mixed poly(tert-butyl acrylate) (PtBA)/polystyrene (PS) brush-grafted 67 tun silica nanoparticles cast from chloroform on a carbon-coated transmission electron microscopy (TEM) grid was directly visualized using electron tomography (i.e., 3D TEM). The number average molecular weights for PtBA and PS were 222 and 234 kDa, and their grafting densities were 0.51 and 0.34 chains/nm(2), respectively For a dense monolayer of mixed brush crafted silica particles, a rippled phase structure was observed, and the monolayer consisted of protruded top portions from large nanoparticles and a bottom continuous film."
Our news editors obtained a quote from the research from Fudan University, "In the top protruded part of large nanoparticles, isolated cylindrical PS microdomains were formed in the PtBA matrix due to the low PS volume fraction (i.e., 37%). The morphology in the lower continuous film was strongly influenced by interparticle interactions via mixed polymer brushes. As a result, bicontinuous nanostructures instead of isolated PS microdomains in the PtBA matrix were formed, even though the PS was a minor phase. In the continuous filth, the top and bottom regions gave better microphase separation due to the larger interstitial spaces, and the microphase-separated pattern was dictated by the hexagonal packing of hairy silica particles. For isolated individual particles cast from chloroform, different morphology was observed because of the lack of interparticle interactions. Clear lateral microphase separation was observed only in the bottom part of the particle, likely because the mixed brush layer in the top portion was too thin. In the bottom part, isolated PS microdomains with a truncated wedge shape radiated out from the projected center of the individual particle."
According to the news editors, the research concluded: "This is the first time that detailed 3D morphology was thoroughly characterized for self-assembled mixed brush-grafted nanoparticles cast from a nonselective good solvent."
For more information on this research see: Direct Visualization of Three-Dimensional Morphology in Hierarchically Self-Assembled Mixed Poly(tert-butyl acrylate)/Polystyrene Brush-Grafted Silica Nanoparticles. Macromolecules, 2013;46(16):6575-6584. Macromolecules can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Macromolecules - www.pubs.acs.org/journal/mamobx)
The news editors report that additional information may be obtained by contacting S.D. Tang, Fudan University, Dept. of Macromol Sci, Shanghai 200433, People's Republic of China. Additional authors for this research include T.Y. Lo, J.M. Horton, C.H. Bao, P. Tang, F. Qiu, R.M. Ho, B. Zhao and L. Zhu (see also Styrenes).
Keywords for this news article include: Asia, Shanghai, Acrylates, Nanoparticle, Polystyrenes, Acyclic Acids, Nanotechnology, Benzene Derivatives, Benzylidene Compounds, Emerging Technologies, People's Republic of China
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