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Preparation of Carboxyl‐Functionalized Polystyrene/Silica Composite Nanoparticles
Author(s) -
Zeng Zhong,
Yu Jian,
Guo ZhaoXia
Publication year - 2004
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200400201
Subject(s) - polystyrene , methacrylic acid , poly(methacrylic acid) , emulsion polymerization , nanoparticle , composite number , polymerization , materials science , copolymer , polymer chemistry , chemical engineering , surface modification , polymer , nanotechnology , composite material , engineering
Summary: This paper describes the synthesis of carboxyl‐functionalized polystyrene/silica (PS/SiO 2 ) composite nanoparticles with various contents of poly(methacrylic acid) (PMAA) on the surface by post‐addition of methacrylic acid (MAA) via emulsion polymerization. High yields and binding efficiencies (around 90%) are achieved by an optimal procedure mainly involving the appropriate addition of MAA and amounts of surfactant and silica. The kinetics investigated indicates that the polymerization follows a mechanism different than that found in some earlier studies. The amount of grafted PMAA was determined by titration and FT‐IR, and altered in a wide range (1–40 wt.‐% to PS). Transmission electron microscopy (TEM) photographs show that the composite nanoparticles are about 60 nm in spherical shape and have a multi‐layered core‐shell structure with a cluster of primary silica beads as the core and PMAA as the outmost shell. There are approximately 4 to 21 primary silica beads in one composite nanoparticle, depending on the amount of silica added.Preparation of carboxyl‐functionalized polystyrene(PS)/silica composite nanoparticles.