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Cationisation of Starch Granules by Graft Copolymerisation
Author(s) -
Gruber Erich,
Bothor Roland
Publication year - 1998
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/(sici)1521-379x(199806)50:6<257::aid-star257>3.0.co;2-#
Subject(s) - starch , polymer chemistry , polymer science , chemistry , food science
A method is presented to cationize granular starch by heterogeneous graft copolymerisation by using a redox‐initiator. The graft content that can be reached depends on the kind of starch used and on the nature of the chosen monomer. Among the monomers tested a cationic methacrylic ester with acrylamide as co‐monomer was most effective to reach a high degree of ionicity. The modification fosters swelling, but hydration proceeds without impairing the morphology and the gelatinization temperature of the starch. Cationically grafted starch shows less retrogradation. The aim to modify exclusively the surface of the starch granules to obtain optimal accessibility of the cationic charges was not fully reached. Basically the cationic monomers are grafted within the peripheral layers of a starch granule but at increasing graft contents an increasing part of grafting takes place mainly at the surface of the granule.