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Preparation of a starch‐ graft ‐acrylamide/kaolinite superabsorbent composite and the influence of the hydrophilic group on its water absorbency
Author(s) -
Wu Jihuai,
Wei Yuelin,
Lin Jianming,
Lin Songbai
Publication year - 2003
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1303
Subject(s) - acrylamide , starch , saponification , kaolinite , copolymer , composite number , polymer chemistry , superabsorbent polymer , nuclear chemistry , chemistry , materials science , chemical engineering , polymer , composite material , food science , organic chemistry , mineralogy , engineering
A novel starch‐ graft ‐acrylamide/kaolinite superabsorbent composite with water absorbency 4000 times (g $\rm{g}_{\rm sample}^{-1})$ ) was synthesized by a graft copolymerization reaction among acrylamide, potato starch and kaolinite ultrafine powder, followed by saponification with NaOH. The influence of the hydrophilic group on water absorbency was investigated. It was found that the combined absorbent effect of —CONH 2 , —COONa and —COOH groups was superior to that of a single group, and the composite with the molar ratio of 8:6:3 for the —CONH 2 , —COONa and —COOH groups exhibits the highest water‐absorbent ability. Copyright © 2003 Society of Chemical Industry