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Starch modification using a twin‐roll mixer as a reactor
Author(s) -
Qiao Dongling,
Zou Wei,
Liu Xingxun,
Yu Long,
Chen Ling,
Liu Hongshen,
Zhang Nuozi
Publication year - 2012
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.201200044
Subject(s) - starch , acrylamide , corn starch , chemical engineering , modified starch , materials science , polymer , rheometer , chemical modification , polymer chemistry , chemistry , organic chemistry , composite material , copolymer , rheology , engineering
A starch modification reactor has been established using a HAAKE rheometer incorporating a twin‐roll mixer, which has been modified to improve its sealing and feeding, and to establish an oxygen‐free environmental. The advantages of the system include: (i) starch modification can be carried out at high starch concentration (up to 70%); (ii) combining the steps of starch gelatinization and chemical modification; (iii) controllable reaction time; and (iv) smaller sample size (60 g) requirement. The effects of water content, rpm, time, and temperature on the reactive system was systematically investigated. Corn starch (60% starch concentration) was successfully grafted with acrylamide then crosslinked by N,N ′‐methylene‐bisacrylamide to produce biodegradable superabsorbent polymers using this reactor.