Influence of plasticizer with different functional groups on thermoplastic starch |
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| Authors: | Muhammad B K Niazi Mark Zijlstra Antonius A Broekhuis |
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| Affiliation: | 1. Department of Chemical Engineering/Institute for Technology and Management, University of Groningen, The Netherlands;2. School of Chemical and Materials Engineering, National University of Science and Technology, Islamabad, Pakistan;3. Champion Technologies Europe BV, Delden, The Netherlands |
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| Abstract: | Retrogradation of amorphous thermoplastic starch (TPS) films obtained by compression molding of spray dried modified potato starch was investigated. The aim was to investigate the influence of plasticizers with similar molecular weight but different functionality, i.e., isoleucine, asparagine and malic acid, on the properties of plasticized powder and TPS films. Combinations of malic acid with glycerol, urea, and maltodextrin were also evaluated. Except for isoleucine formulated starch, all samples were obtained as amorphous powders and films. Malic acid was identified as a strong antiretrogradation agent as it inhibited recrystallization of starch over the full range of humidity levels. Malic acid was also found to inhibit the retrogradation of formulations containing urea, glycerol and maltodextrin. The converse of the strong inhibition implied strong moisture absorption and high strain at break values, and low tensile strengths. Malic acid was also identified as a potential crosslinking agent to control swelling of starch‐based products. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42012. |
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| Keywords: | amorphous biodegradable crystallization plasticizer thermoplastics |
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