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Toughening of unsaturated polyester resins with core–shell rubbers
Author(s) -
Huang YanJyi,
Wu JiaHorng,
Liang JiingGuan,
Hsu MannWen,
Ma JiunKwei
Publication year - 2007
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.25159
Subject(s) - materials science , composite material , differential scanning calorimetry , emulsion polymerization , methyl methacrylate , glycidyl methacrylate , curing (chemistry) , scanning electron microscope , acrylate , ethylene glycol dimethacrylate , polyester , methacrylate , fracture toughness , styrene , copolymer , polymer , methacrylic acid , physics , thermodynamics
The effects of core–shell rubbers (CSRs) as tougheners on the fracture properties of unsaturated polyester (UP) resins during curing at 110°C are investigated. CSRs were synthesized by two‐stage soapless emulsion polymerizations; the soft core was made from rubbery poly( n ‐butyl acrylate), whereas the hard shell was made from methyl methacrylate, ethylene glycol dimethacrylate, and various concentrations of glycidyl methacrylate. Depending on the content of glycidyl methacrylate in the CSR shell and the amount of CSR added to the UP, the fracture properties of the CSR‐toughened UP resins varied. The experimental results are explained by an integrated approach of measurements of the static phase characteristics of a styrene/UP/CSR system, the reaction kinetics, the cured sample morphology, the glass‐transition temperatures, and the fracture toughness with differential scanning calorimetry, scanning electron microscopy, transmission electron microscopy, and dynamic mechanical analysis. Finally, the toughening mechanism for the CSR‐toughened UP resins is also explored. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008