Blends of polystyrene and poly(n-butyl methacrylate) mediated by perfluorocarbon end groups
作者:Jingguo Shen、Victoria A. Piunova、Steven Nutt、Thieo E. Hogen-Esch
DOI:10.1016/j.polymer.2013.08.059
日期:2013.10
Structurally well-defined C4F9, C7F15, C10F21 and C13F27 end-functionalized polystyrene (RF-PS) and polybutylmethacrylate (RF-PBMA) were prepared by Atom Transfer Radical Polymerization using RF-tagged initiators. Blends (1/1 wt/wt) of these polymers were studied by differential scanning calorimetry (DSC), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), optical transmittance(OT), electron microscopy (TEM) and optical transmittance (OT). The RF-PS/RF-PBMA blends having molecular weights of 20,000 and C7F15 or larger end groups, were optically transparent. The AFM micrographs show crater, necklace and other RF mediated morphologies typically at the submicron scale. TEM images of the corresponding blends show assembly of elongated domains with sizes in the micron or nanometer scales depending on MW and RF size. Thus, above about 3 wt percent RF content only microphases (m) are observed while below 1.8 wt percent only macrophases (M) are seen. A semiquantitative "phase diagram" of the blends shows that lower MWs and longer RF groups improve phase compatibilities. (C) 2013 Elsevier Ltd. All rights reserved.
COPOLYMER-MODIFIED NANOPARTICLES, ESPECIALLY FOR USE IN MEDICAL ARTICLES
申请人:Barcikowski Stephan
公开号:US20130197628A1
公开(公告)日:2013-08-01
Copolymer-modified nanoparticles produced by a process in which nanoparticles are ablated by laser radiation from a surface of a substrate in a liquid include an amphiphilic copolymer.
US9243089B2
申请人:——
公开号:US9243089B2
公开(公告)日:2016-01-26
Potential antiatherosclerotic agents. 4. [(Functionalized-alkyl)amino]benzoic acid analogs of cetaben
作者:Vern G. DeVries、Elwood E. Largis、Thomas G. Miner、Robert G. Shepherd、Janis Upeslacis
DOI:10.1021/jm00364a011
日期:1983.10
the alkyl group of cetaben is substituted with various functional groups or replaced entirely by a functionalized alkanoyl moiety is described. Also reported are the syntheses of branched-chain (alkylamino)benzoic acids in which branching is specifically localized at the terminus of the alkyl chain. Structure-activity relationships of these compounds, both as hypolipidemic agents and as inhibitors of