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http://dx.doi.org/10.7317/pk.2015.39.2.329

Preparation of MWCNTs/Poly(methyl methacrylate) Composite Particles via the Emulsion Polymerization of Methyl Methacrylate Using MWCNTs Modified by Silanization Reaction and Their Morphological Characteristics  

Kwon, Jaebeom (Department of Chemical Engineering, Keimyung University)
Park, Seonghwan (Department of Chemical Engineering, Keimyung University)
Kim, Sunghoon (Department of Chemical Engineering, Keimyung University)
Jo, Jieun (KDChem)
Han, Changwoo (KDChem)
Ha, KiRyong (Department of Chemical Engineering, Keimyung University)
Publication Information
Polymer(Korea) / v.39, no.2, 2015 , pp. 329-337 More about this Journal
Abstract
In this study, multi-walled carbon nanotubes (MWCNTs) were oxidized with a mixture of nitric acid and sulfuric acid. After oxidation, oxidized MWCNTs were treated with thionyl chloride ($SOCl_2$) and 1,4-butanediol (BD) in sequence at room temperature to introduce hydroxyl groups on the surface of MWCNTs. The prepared MWCNT-OH was silanized with 3-methacryloxypropyltrimethoxylsilane (MPTMS) to make MWCNT-MPTMS. The MWCNT-MPTMS was used as fillers in emulsion polymerization to make MWCNT-MPTMS/PMMA composite particles with 3 kinds of emulsifiers, hexadecyltrimethylammoniumbromide (CTAB) as a cationic, sodium dodecylbenzene sulfonate (SDBS) as an anionic and polyethylene glycol tert-octylphenyl ether (Triton X-114) as a nonionic emulsifier. Morphologies of composite emulsions were confirmed by a particle size analyzer (PSA) and a scanning electron microscope (SEM). Morphologies of emulsion polymerized MWCNT-MPTMS/PMMA with SDBS showed more uniform particle size distribution compared to those of other two emulsifiers used emulsions. MWCNT-MPTMS/PMMA showed $3.4^{\circ}C$ higher $T_g$ compared to pristine MWCNT/PMMA due to covalent bond formation at interface of MWCNT-MPTMS and PMMA.
Keywords
multi-walled carbon nanotubes; oxidation; hydroxyl group; silane coupling agent; emulsion polymerization;
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