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Non-Toxic Crosslinking of Starch Using Polycarboxylic Acids: Kinetic Study and Quantitative Correlation of Mechanical Properties and Crosslinking Degrees

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Abstract

For the first time, kinetics of citric acid crosslinking of starch was studied, and mechanical properties of starch films were quantitatively correlated with crosslinked degrees and structures of polycarboxylic acids. To substitute toxic crosslinkers to improve the properties of bio-derived polymers, non-toxic polycarboxylic acids were widely used to improve the performance properties of starch-derived industrial products, and were proved effective. However, the mechanism of the reaction and relationship between crosslinking extents and performance properties of starch products had not been clarified. In this study, crosslinking of starch by polycarboxylic acids was verified, and logarithmic relationship between crosslinking degree and strength was elucidated. The polycarboxylic acids with more carboxyl groups could more effectively improve the tensile properties of starch films. In general, crosslinking using polycarboxylic acids might improve the mechanical properties of starch products in a controlled manner and thus could facilitate their industrialization.

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Acknowledgments

This research was financially supported by the Key Scientific and Technological Projects of Science and Technology Commission of Shanghai Municipality (12JC1400300), U.S. Department of Agriculture-National Institute of Food and Agriculture (Multistate Research Project S-1054 (NEB 37-037), Hatch Act), Nebraska Corn Board, and the Agricultural Research Division at the University of Nebraska-Lincoln.

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Authors and Affiliations

  1. Key Laboratory of Science and Technology of Eco-Textiles, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, 201620, China

    Li Shen & Lingjuan Kong

  2. Department of Textiles, Merchandising and Fashion Design, University of Nebraska-Lincoln, 234, HECO Building, Lincoln, NE, 68583-0802, USA

    Helan Xu & Yiqi Yang

  3. Department of Biological Systems Engineering, University of Nebraska-Lincoln, 234, HECO Building, Lincoln, NE, 68583-0802, USA

    Yiqi Yang

  4. Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, 234, HECO Building, Lincoln, NE, 68583-0802, USA

    Yiqi Yang

Authors
  1. Li Shen
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  2. Helan Xu
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  3. Lingjuan Kong
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  4. Yiqi Yang
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Correspondence to Yiqi Yang.

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Shen, L., Xu, H., Kong, L. et al. Non-Toxic Crosslinking of Starch Using Polycarboxylic Acids: Kinetic Study and Quantitative Correlation of Mechanical Properties and Crosslinking Degrees. J Polym Environ 23, 588–594 (2015). https://doi.org/10.1007/s10924-015-0738-3

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  • DOI: https://doi.org/10.1007/s10924-015-0738-3

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