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Synthesis and Characteristics of Graft Copolymerization of Starch-G-PAM Using A Twin-Roll Mixer as Reactor for Cornstarch with Different Amylose/Amylopectin Ratios

  • D. Qiao , H. Ma , L. Yu , H. Liu , W. Zou , L. Chen and P. Chen
Published/Copyright: April 29, 2014
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Abstract

Starch-based superabsorbent polymers (SAPs) were produced by graft copolymerization of starch-g-acrylamide using a twin-roll mixer as reactor. This work focused on the effect of starch microstructure (amylose/amylopectin contents) from the same source (corn starch) on the graft ratio (GR), graft efficiency (GE) and Add-on (AO), as well as water absorption capability (WAC) of the SAPs, which were investigated by FTIR, NMR, gravimetric and TGA. The torque variation represented all the processing in the reactor, including compress, gelatinization, graft reaction and crosslinking. Results showed that all the starches were successfully grafted with acrylamide then crosslinked by N.N′-methylene-bisacrylamide through this technology. Both AO and GR increased with increasing amylose content. But the GE decreased with increasing amylose content, which is different from the results in the solution reaction. The higher WAC of high amylose starch-based SAP corresponds with higher AO and GR, while the higher WAC of waxy-based SAP corresponds with higher GE.


* Correspondence address Mail address: Long Yu, CPFRR, South China University of Technology, Guangzhou, PRC E-mail:

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Received: 2013-07-18
Accepted: 2013-09-24
Published Online: 2014-04-29
Published in Print: 2014-04-29

© 2014, Carl Hanser Verlag, Munich

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