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Gamma‐Irradiated Cationic Starches: Paper Surface‐Sizing Agents
Author(s) -
Hofreiter B. T.,
Heath H. D.,
Schulte M. I.,
Phillips B. S.
Publication year - 1981
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.19810330109
Subject(s) - cationic polymerization , sizing , starch , irradiation , dispersion (optics) , chemical engineering , gamma irradiation , viscosity , alkali metal , materials science , chemistry , polymer chemistry , composite material , organic chemistry , physics , nuclear physics , optics , engineering
Cationic starches, precisely depolymerized by gamma‐irradiation ( 60 Co), were dispersed in mild alkali and evaluated as surface sizes for bond paper on a pilot paper machine. The irradiated products had excellent dispersion properties, were well retained on fibers when sized wastepaper (broke) was repulped and had an ability to enhance paper properties that was comparable to that of starch‐based materials used commercially. A yellow corn flour, cationized by an essentially dry reaction process recently developed at this Center, was also radiolyzed and evaluated as a size. This latter product was unique in that all drying steps were eliminated in the preparation of a cationic ceral product of reduced viscosity.