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Rheokinetics of graft copolymerization of acrylamide in concentrated starch and rheological behaviors and microstructures of reaction products

Lookup NU author(s): Professor David XieORCiD

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Abstract

A widely recognized challenge in starch chemistry is to manipulate the graft copolymerization onto starch melt by reactive extrusion (REX). To understand the complex in-situ graft copolymerization in highly concentrated systems, we firstly used a mixer to achieve a homogeneous viscous starch melt, and then undertook dynamic rheological measurements to study the rheokinetics of the reaction. The in-situ synthesis also facilitated the characterization of the microstructures of reaction products. The melt mixture could be regarded to be completely micromixed since the rheokinetics was predominated by the reaction kinetics. The rheological characterization revealed that G′ of hydrogels followed a linear progression with the crosslinker concentration. Nevertheless, the reaction temperature and initiator content had little influence on the final microstructure of hydrogels, most likely due to the strong chain transfer reaction in the melt. Additionally, high-amylose starches tended to form grafted hydrogels with a high physical crosslinking density.

Publication metadata

Author(s): Bao X, Yu L, Simon GP, Shen S, Xie F, Liu H, Chen L, Zhong L

Publication type: Article

Publication status: Published

Journal: Carbohydrate Polymers

Year: 2018

Volume: 192

Pages: 1-9

Print publication date: 15/07/2018

Online publication date: 15/03/2018

Acceptance date: 14/03/2018

Date deposited: 23/05/2023

ISSN (print): 0144-8617

ISSN (electronic): 1879-1344

Publisher: Elsevier

URL: https://doi.org/10.1016/j.carbpol.2018.03.040

DOI: 10.1016/j.carbpol.2018.03.040

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