Abstract
The aim of this study was to improve the compatibility of starch with poly(lactic acid) (PLA) through the modification of corn starch by acetylation. As revealed from the NMR hydrogen spectra, three acetylated starch (ACS) with different degrees of substitution were successfully prepared. The ACS/PLA blended film was prepared by solution casting method. In accordance with the SEM results, the tensile strength and water resistance of ACS/PLA blend film improved when starch compatibility with PLA increased with more starch replacement. The initial thermal degradation temperature and decomposition interval of the blended film were significantly increased, in accordance with the obtained TG data. In addition, based on the single-factor experiments, a mathematical model of the quadratic polynomial regression equation between the process parameters (starch substitution (DS), PLA content, and glyceryl triacetate (GTA) content) and the tensile properties of the ACS/PLA blended film was constructed using the response surface method. On the basis of this model, optimal processing parameters with the least amount of PLA addition were required and the maximum tensile strength of the blended films could be calculated. The model was subsequently verified experimentally to be highly reliable. The model results produced in this study can also be used as a reference to extend the application of ACS/PLA blended film in food packaging, medical and agricultural floor film.
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Yang, S., Ma, H., Chen, Y. et al. Optimization of processing parameters in poly(lactic acid)-reinforced acetylated starch composite films by response surface methodology. Iran Polym J 32, 251–261 (2023). https://doi.org/10.1007/s13726-022-01113-0
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DOI: https://doi.org/10.1007/s13726-022-01113-0