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Starch modification using a twin-roll mixer as a reactor

Authors

  • Dongling Qiao,

    1. Centre for Polymers from Renewable Resources, ERCPSP, South China University of Technology, Guangzhou, P. R. China
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  • Wei Zou,

    1. Centre for Polymers from Renewable Resources, ERCPSP, South China University of Technology, Guangzhou, P. R. China
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  • Xingxun Liu,

    1. Centre for Polymers from Renewable Resources, ERCPSP, South China University of Technology, Guangzhou, P. R. China
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  • Long Yu,

    Corresponding author
    1. Centre for Polymers from Renewable Resources, ERCPSP, South China University of Technology, Guangzhou, P. R. China
    2. Commonwealth Scientific & Industrial Research Organisation, Materials Science and Engineering, Melbourne, Victoria, Australia
    • SCUT, Guangzhou 510640, P. R. China Fax: +61-3-95441128.
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  • Ling Chen,

    1. Centre for Polymers from Renewable Resources, ERCPSP, South China University of Technology, Guangzhou, P. R. China
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  • Hongshen Liu,

    1. Centre for Polymers from Renewable Resources, ERCPSP, South China University of Technology, Guangzhou, P. R. China
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  • Nuozi Zhang

    1. Commonwealth Scientific & Industrial Research Organisation, Materials Science and Engineering, Melbourne, Victoria, Australia
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Abstract

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.

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