$Crosslinking-induced morphology change of latex nanoparticles: A study of RAFT-mediated polymerization in aqueous dispersed media using amphiphilic double-brush copolymers as reactive surfactants$
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Crosslinking-induced morphology change of latex nanoparticles: A study of RAFT-mediated polymerization in aqueous dispersed media using amphiphilic double-brush copolymers as reactive surfactants

ABSTRACT Amphiphilic double‐brush copolymers (DBCs) with each graft site quantitatively carrying both a hydrophilic poly(ethylene oxide) (PEO) graft and a hydrophobic polystyrene (PSt) graft are synthesized by sequential reversible addition‐fragmentation chain transfer (RAFT) polymerization and ring...

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Bibliographic Details
Published in:	Journal of polymer science. Part A, Polymer chemistry Vol. 52; no. 22; pp. 3250 - 3259
Main Authors:	Li, Yukun, Christian-Tabak, Leela, Fuan, Vivien Li Fong, Zou, Jiong, Cheng, Chong
Format:	Journal Article
Language:	English
Published:	Hoboken, NJ Blackwell Publishing Ltd 15-11-2014 Wiley Wiley Subscription Services, Inc
Subjects:	Applied sciences brush polymer Crosslinking Dispersion Exact sciences and technology Graft copolymers Latex Morphology Nanoparticles Organic polymers Physicochemistry of polymers Polymerization Polymers with particular properties Preparation, kinetics, thermodynamics, mechanism and catalysts Rafts reactive surfactant reversible addition fragmentation chain transfer (RAFT) polymerization ring-opening metathesis polymerization Terpolymer Graft copolymer Nanoparticle reversible addition fragmentation chain transfer (RAFT) polymerization Complex catalyst polymerization Macromer Chain transfer nanoparticles Emulsion polymerization Linear polymer Crosslinked polymer Styrene polymer ring-opening metathesis polymerization Amphiphilic polymer Organic trithiocarbonate brush polymer Norbornene copolymer Ethylene oxide copolymer Experimental study reactive surfactant Latex Free radical polymerization Metathesis polymerization Morphology Preparation Styrene Living copolymer Interface activity crosslinking Block copolymer Styrene copolymer
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Summary:	ABSTRACT Amphiphilic double‐brush copolymers (DBCs) with each graft site quantitatively carrying both a hydrophilic poly(ethylene oxide) (PEO) graft and a hydrophobic polystyrene (PSt) graft are synthesized by sequential reversible addition‐fragmentation chain transfer (RAFT) polymerization and ring‐opening metathesis polymerization (ROMP). These DBCs are used as both surfactants and polyfunctional RAFT agents in the radical polymerization of St in aqueous dispersed media. Miniemulsions with narrowly dispersed St‐based nanodroplets are readily obtained after ultrasonication of the reaction mixtures. Without the presence of crosslinker, chain‐extension polymerization of St from the DBCs yields well‐defined polymeric latexes with narrow size distributions. However, with the presence of divinylbenzene (DVB) as the crosslinker, vesicular polymeric nanoparticles are formed as the major product. Such crosslinking‐induced change in morphology of the resulting latex nanomaterials may be ascribed to the increase of interfacial curvature in the heterophase systems during crosslinking polymerization. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 3250–3259 Amphiphlic brush copolymers with each graft junction carrying one hydrophilic graft and one hydrophobic graft are synthesized and characterized. They are further used as both surfactants and polyfunctional RAFT agents for radical polymerization of styrene in miniemulsions. Depending on whether crosslinker is present in the polymerization systems, spherical and vesicular latex nanoparticles are obtained, respectively. The mechanism for such unusual crosslinking‐induced morphology change of latex nanoparticles is discussed.
Bibliography:	University at Buffalo ArticleID:POLA27387 ark:/67375/WNG-XMTW5684-B istex:CDC34B4185FA83B43C9124A66D4754CBB724FEB4 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0887-624X 1099-0518
DOI:	10.1002/pola.27387