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Trilayer Composite Poly(styrene/butyl acrylate/acrylic acid) Terpolymer Microspheres with Fe 2 O 3 Middle Layer: Synthesis and Characterization
Author(s) -
Du Hui,
Zhang Peng,
Liu Fengqi,
Kan Shihai,
Wang Dejun,
Li Tiejin,
Tang Xinyi
Publication year - 1997
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199707)43:3<274::aid-pi773>3.0.co;2-d
Subject(s) - materials science , emulsion polymerization , composite number , copolymer , butyl acrylate , styrene , polymer , acrylate , acrylic acid , polymerization , polymer chemistry , nanoparticle , chemical engineering , composite material , nanotechnology , engineering
Fe 2 O 3 particles with diameter of 3–5 nm were encapsulated in polymer spheres (styrene/butyl acrylate/acrylic acid terpolymer latex) by emulsion polymerization. Control of the pH value of the medium and modification of the latex prior to the second polymerization were of importance in determining the microstructure and morphology of the composite particles. The interaction between Fe 2 O 3 and seed latex was confirmed by IR spectral changes of the surface groups of the latex particles. Mossbauer spectra gave evidence for the changes of electric density and electric field symmetry around Fe 2 O 3 , and surface photovoltage spectra indicated that the Fe 2 O 3 particles were encapsulated in polymer. It was shown by all the results that the composite microspheres of size 80 nm had a core–shell structure with trilayers of seed latex core, Fe 2 O 3 nanoparticles middle layer and polymer shell. © 1997 SCI.