Toggle Main Menu Toggle Search

Open Access padlockePrints

Starch–zinc complex and its reinforcement effect on starch-based materials

Lookup NU author(s): Professor David XieORCiD

Downloads


Licence

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

In this work, we found that ZnCl2 solution can not only be used as a plasticizer for starch but also provide a mechanical reinforcement effect to the resultant starch-based materials. By a one-step compression molding process, well-plasticized starch-based films could be obtained at 120 °C with a 15 wt.% ZnCl2 solution. Both the tensile strength and elongation at break of the films increased with a rise in ZnCl2 concentration, which demonstrates a mechanical reinforcement. This reinforcement could be mainly ascribed to the in-situ formed starch-zinc complexes and the enhanced starch molecular interactions. Moreover, if the processing method was changed into firstly mixing followed by compression molding, the tensile strength increased by more than three folds at no cost of the elongation at break. Regarding this, we propose that shear could further enhance the molecular interactions within the material. However, if the ZnCl2 concentration was too high, the mechanical properties were then reduced irrespective of the processing protocol, which could be due to the weakened molecular interactions by ZnCl2. Thus, we have demonstrated a new, simple method for preparing starch-based composite materials with enhanced mechanical properties, which could be potentially applied to many fields such as packaging, coating and biomedical materials.


Publication metadata

Author(s): Liu P, Li Y, Shang X, Xie F

Publication type: Article

Publication status: Published

Journal: Carbohydrate Polymers

Year: 2019

Volume: 206

Pages: 528-538

Print publication date: 15/02/2019

Online publication date: 14/11/2018

Acceptance date: 11/11/2018

Date deposited: 23/05/2023

ISSN (print): 0144-8617

ISSN (electronic): 1879-1344

Publisher: Elsevier

URL: https://doi.org/10.1016/j.carbpol.2018.11.034

DOI: 10.1016/j.carbpol.2018.11.034


Altmetrics

Altmetrics provided by Altmetric


Share