Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/318862
Type: research-article
Title: Synthesis and applications of polystyrene-block-poly(N-vinyl-2-pyrrolidone) copolymers
Title Alternative: 
Author: Farias
Marcelo Alexandre de; Gonçalves
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 Stöber 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.
Citation: Polímeros, 26, 1, p.1-. 2016.
Rights: aberto
Identifier DOI: 10.1590/0104-1428.2066
Address: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282016000100002
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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