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Type: Artigo
Title: Synthesis And Applications Of Polystyrene-block-poly(n-vinyl-2-pyrrolidone) Copolymers
Author: de Farias
Marcelo Alexandre; Goncalves
Maria do Carmo
Abstract: This work describes the synthesis and applications of amphiphilic polystyrene-block-poly(N-vinyl-2-pyrrolidone) (PS-b-PVP) copolymers as a silver and silica nanoparticle surface modification agent. The synthesis of PS-b-PVP was carried out using controlled/living radical polymerization techniques. The synthesis of the block copolymers was confirmed by gel permeation chromatography and hydrogen nuclear magnetic resonance, presenting a polydispersity index of around 1.4 and number average molecular weight ranging between 10,000-14,000 g mol(-1). The PS-b-PVP copolymers were applied as a silver nanoparticle (AgNP) stabilizing agent. These nanoparticles were produced by a single step and presented an 11 +/- 1 nm diameter. Furthermore, the PS-b-PVP copolymers were also applied as a silica nanoparticle (SiO2NP) surface modification agent. The SiO2NP were synthesized by the Stober method presenting a 72 +/- 9 nm diameter. The SiO2NP surface modification by adsorption of PS-b-PVP caused the formation of a 5 +/- 1 nm thick polymeric layer, providing the SiO2NP with a hydrophobic surface character. The structural and chemical characteristics shown by PS-b-PVP copolymers highlights their versatility for several applications, such as: water-in-oil emulsifier, stabilizing or coupling agents between inorganic particles and polymeric matrices.
Subject: Amphiphilic Block Copolymers
Controlled Radical Polymerization
Silica Nanoparticles
Silver Nanoparticles
Surface Modification Agent
Editor: Associação Brasileira de Polímeros
São Carlos
Citation: Polimeros-ciencia E Tecnologia. Associação Brasileira De Polímeros, v. 26, p. 1 - 10, 2016.
Rights: aberto
Identifier DOI: 10.1590/0104-1428.2066
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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