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Polymer-encapsulation of anisotropic inorganic particles by raft-mediated emulsion polymerization

Grant number: 10/50383-5
Support Opportunities:Regular Research Grants
Duration: January 01, 2011 - March 31, 2014
Field of knowledge:Engineering - Chemical Engineering - Chemical Technology
Convênio/Acordo: IUPAC
Principal Investigator:Amilton Martins dos Santos
Grantee:Amilton Martins dos Santos
Principal researcher abroad: Elodie Bourgeat
Institution abroad: Université de Lyon, France
Principal researcher abroad: Ana Timmons
Institution abroad: Universidade de Aveiro (UA), Portugal
Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil


The incorporation of inorganic particles into polymers is a crucial issue in material science. To preserve and control the unique physical properties of inorganic particles, it is essential to maintain their nanoscale integrity and achieve uniform dispersions. This issue is particularly challenging for anisotropic nano-objects. Whilst a profusion of solvent-borne synthetic strategies involving controlled-radical polymerization are now available to coat the surface of inorganics with polymer brushes, less attention has been dedicated to waterborne systems. Polymer-encapsulated inorganic particles can find applications in various fields including coatings and adhesives. However, current encapsulation techniques through emulsion polymerization suffer from several limitations that restrict the range of inorganic materials that can be efficiently encapsulated. To circumvent these limitations, we propose to develop a generic synthetic method involving emulsion polymerization and the reversible addition-fragmentation chain-transfer (RAFT) technique to produce hybrid latex particles composed of an inorganic core surrounded by a polymer shell. Amphipathic macro-RAFT agents carrying suitable anchor groups for adsorption or grafting to the inorganic surface and a thiocarbonylthio functionality able to control radical polymerization of styrene and (meth)acrylic monomers will be synthesized for this purpose. These polymer precursors should ensure sufficient colloidal stability of the inorganic particles before polymerization and allow subsequent growth of a polymer shell without secondary nucleation. Different types of inorganic materials will be investigated including anisotropic clay platelets and silica-coated luminescent Gd203:Eu3+ nanotubes. The former should provide enhanced mechanical properties while the later is intended to introduce optical functions. The three partners have been carefully selected for their complementary skills. The French and Brazilian teams have been engaged in several joint research programs since 2001 and will provide expertise in RAFT polymerization and synthesis of composite latexes through emulsion polymerization. The Portuguese partner has skills in encapsulation techniques and (...) (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CHAPARRO, THAISSA C.; SILVA, RODRIGO D.; DUGAS, PIERRE-YVES; D'AGOSTO, FRANCK; LANSALOT, MURIEL; MARTINS DOS SANTOS, AMILTON; BOURGEAT-LAMI, ELODIE. Laponite (R)-based colloidal nanocomposites prepared by RAFT-mediated surfactant-free emulsion polymerization: the role of non-ionic and anionic macroRAFT polymers in stability and morphology control. Polymer Chemistry, v. 12, n. 1, p. 69-81, . (10/19919-6, 10/50383-5, 11/20533-8)
SILVA, RODRIGO DUARTE; CHAPARRO, THAISSA DE CAMARGO; MONTEIRO, IGOR STEFANICHEN; DUGAS, PIERRE-YVES; D'AGOSTO, FRANCK; LANSALOT, MURIEL; DOS SANTOS, ARNILTON MARTINS; `BOURGEAT-LAMI, ELODIE. Tailoring the Morphology of Polymer/Montrnorillonite Hybrid Latexes by Surfactant-Free Emulsion Polymerization Mediated by Arnphipathic MacroRAFT Agents. MACROMOLECULES, v. 52, n. 13, p. 4979-4988, . (10/50383-5, 11/20533-8)
SILVA, RODRIGO DUARTE; MONTEIRO, IGOR STEFANICHEN; CHAPARRO, THAISSA DE CAMARGO; HARDT, RAISSA SILVA; GIUDICI, REINALDO; BARROS-TIMMONS, A.; BOURGEAT-LAMI, ELODIE; DOS SANTOS, AMILTON MARTINS. Investigation of the Adsorption of Amphipathic macroRAFT Agents onto Montmorillonite Clay. Langmuir, v. 33, n. 38, p. 9598-9608, . (10/50383-5, 11/20533-8)

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