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Synthesis of Starch Copolymers by Silicon Tetrachloride Plasma‐Induced Graft Polymerization
Author(s) -
Ma Yonghui C.,
Manolache Sorin,
Sarmadi Majid,
Denes Ferencz S.
Publication year - 2004
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.200300236
Subject(s) - copolymer , starch , x ray photoelectron spectroscopy , fourier transform infrared spectroscopy , materials science , polymer chemistry , chemical engineering , polymerization , nuclear chemistry , chemistry , composite material , organic chemistry , polymer , engineering
Corn starch was surface‐functionalized by 13.56 MHz RF SiCl 4 ‐plasma, in situ reacted with ethylenediamine for stabilization, and subsequently graft‐polymerized using dichlorodimethylsilane as monomer. SiCl 4 ‐plasma treatment was studied and discharge parameters were optimized. X‐ray photoelectron spectroscopy (XPS/ESCA), Fourier transformed infrared spectroscopy (FTIR), scanning electron spectroscopy (SEM), gas chromatography/mass spectroscopy (GC‐MS), and differential thermal analysis/thermal gravimetry (DTA/TG) proved the presence of a polydimethylsiloxane (PDMS) graft‐copolymer layer on the modified starch‐granule surfaces. These analyses show that the surface morphology of starch granules, the thermal properties, the swelling characteristic, and the hydrophilicity of starch were all changed due to the existence of a protective hydrophobic PDMS layer. It is suggested that the starch graft‐copolymer might find its applications as reinforcing component in silicone‐rubber materials for starch‐based composites.