Synthesis and applications of polystyrene-block-poly(N-vinyl-2-pyrrolidone) copolymers

Author(s)

Marcelo Alexandre de Farias ; Maria do Carmo Gonçalves

• Document type: Journal article
• Source: POLIMEROS-CIENCIA E TECNOLOGIA; v. 26, n. 1, p. 1-10, Fev. 2016.

Abstract

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. (AU)

• FAPESP's process: 08/57867-8 - National Institute for Research, Development and Innovation in Functional Complex Materials
• Grantee: Fernando Galembeck
• Support type: Research Projects - Thematic Grants
• FAPESP's process: 10/17804-7 - Polymeric composites
• Grantee: Maria Isabel Felisberti
• Support type: Research Projects - Thematic Grants