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Effect of reaction conditions on grafting ratio and properties of starch nanocrystals‐ g ‐polystyrene
Author(s) -
Wang Cai,
Pan Zelin,
Wu Meiyan,
Zhao Ping
Publication year - 2014
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.40571
Subject(s) - crystallinity , copolymer , grafting , polystyrene , polymer chemistry , materials science , starch , styrene , monomer , polymerization , polymer , nanocrystal , chemical engineering , emulsion polymerization , nanocomposite , fourier transform infrared spectroscopy , chemistry , composite material , organic chemistry , nanotechnology , engineering
Starch nanocrystals‐ g ‐polystyrene (StN‐ g ‐PS) was synthesized by free radical emulsion copolymerization of starch nanocrystals with styrene. The effect of polymerization conditions on grafting efficiency (GE) and grafting ratio (GR) were investigated. It was found that during graft copolymerization procedure both GE and GR increase with increasing monomer concentration and reaction time. As a result the high GE and high GR can be achieved. The good linear fit of the GR with A St / A OH (the absorption strength ratio of aromatic ring peaks and hydroxyl group peaks) confirmed that during graft copolymerization, FTIR spectra can be used as a simple method for determining GR. X‐ray diffraction showed that the crystallinity of StN‐ g ‐PS decreased slightly with increasing GR. Grafted polystyrene side chains can improve the interface compatibility of starch nanocrystals with the hydrophobic polymer matrix. The mechanical properties of StN‐ g ‐PS/rubber nanocomposites can be obviously enhanced. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40571.