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Nano‐SiO 2 / PMMA‐PU composite particles with core‐shell structure via emulsion polymerization and their application in epoxy resin
Author(s) -
Huang Zeng Fang,
Qu Xiao Yue,
Chen Zheng
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41919
Subject(s) - materials science , epoxy , composite number , emulsion polymerization , prepolymer , polymer , composite material , methyl methacrylate , polyurethane , polymerization , nanoparticle , grafting , emulsion , chemical engineering , nanotechnology , engineering
A novel method of nano‐SiO 2 /poly(methyl methacrylate)(PMMA)‐polyurethane(PU) composite particles modifying epoxy resin is reported. The composite particles with the obvious core‐shell structure were prepared by emulsion polymerization of PMMA and PU prepolymer on the surface of nano‐SiO 2 . The diameter of the composite particles was 50–100 nm with dark core SiO 2 (30–60 nm) and light shell polymer of PMMA and PU (20–30 nm); moreover, PU was well distributed in PMMA with about 10 nm diameter. After nano‐SiO 2 was encapsulated by PMMA and PU, the Si content on the surface decreased rapidly to 2.08% and the N content introduced by PU was about 1.27%. The ratio of polymer to original nano‐SiO 2 ( f p ), the grafting ratio of polymer to original nano‐SiO 2 ( f r ) and the efficiency grafting ratio of polymer ( f e ) were, respectively, about 116.7%, 104.4%, and 89.5%. The as‐prepared composite particles were an effective toughness agent to modify epoxy resin, and the impact strength of the modified epoxy resin increased to 46.64 kJ m −2 from 19.12 kJ m −2 of the neat epoxy resin. This research may enrich the field of inorganic nanoparticles with important advances toward the modification for polymer composite materials. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41919.