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<p>The goal of this study is to prepare and characterize poly(L-lactide)-<i>b</i>-poly(ethylene glycol)-<i>b</i>-poly(L-lactide)/spent coffee grounds (PLA-PEG-PLA/SCG) biocomposites and compare them to PLA/SCG biocomposites. The biocomposites were prepared by a melt mixing method. Fourier transform infrared (FTIR) spectroscopy shows that the PLA-PEG-PLA matrix chemically interacted with SCG, but the PLA did not interact. Scanning electron microscopy (SEM) of the cryogenic fractured surfaces indicates that the phase compatibility between the PLA-PEG-PLA matrix and SCG dispersed phases was better than between the PLA matrix and SCG dispersed phases. The addition of SCG decreased the crystallinity of both the PLA-PEG-PLA and PLA matrices, as determined by differential scanning calorimetry (DSC). The thermal stability of the PLA fraction in the PLA-PEG-PLA/SCG biocomposites studied through thermogravimetric analysis (TGA) largely increased with an increase in the SCG content, but the effect decreased in the PLA/SCG biocomposites. The hydrophilicity of the biocomposite surfaces and water uptake increased by the addition of SCG for both biocomposite types. Both the PLA/SCG and PLA-PEG-PLA/SCG biocomposites showed lower mechanical properties compared to their pure polymers. However, the PLA-PEG-PLA/SCG biocomposites were still more flexible than the PLA/SCG biocomposites. The incorporated SCG accelerated the biodegradation in burial soil of both the biocomposite types. The results demonstrate the potential of PLA-PEG-PLA/SCG biocomposites as flexible and biodegradable packaging materials.</p>

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Physicochemical and biodegradation properties of flexible poly(L-lactide)-b-poly(ethylene glycol)-b-poly(L-lactide)/spent coffee grounds biocomposites

  • 期刊论文

  • 发表日期：

    2025年6月22日

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  • Yaowalak Srisuwan,
  • Prasong Srihanam,
  • Apirada Manphae,
  • Yodthong Baimark

摘要

The goal of this study is to prepare and characterize poly(L-lactide)-b-poly(ethylene glycol)-b-poly(L-lactide)/spent coffee grounds (PLA-PEG-PLA/SCG) biocomposites and compare them to PLA/SCG biocomposites. The biocomposites were prepared by a melt mixing method. Fourier transform infrared (FTIR) spectroscopy shows that the PLA-PEG-PLA matrix chemically interacted with SCG, but the PLA did not interact. Scanning electron microscopy (SEM) of the cryogenic fractured surfaces indicates that the phase compatibility between the PLA-PEG-PLA matrix and SCG dispersed phases was better than between the PLA matrix and SCG dispersed phases. The addition of SCG decreased the crystallinity of both the PLA-PEG-PLA and PLA matrices, as determined by differential scanning calorimetry (DSC). The thermal stability of the PLA fraction in the PLA-PEG-PLA/SCG biocomposites studied through thermogravimetric analysis (TGA) largely increased with an increase in the SCG content, but the effect decreased in the PLA/SCG biocomposites. The hydrophilicity of the biocomposite surfaces and water uptake increased by the addition of SCG for both biocomposite types. Both the PLA/SCG and PLA-PEG-PLA/SCG biocomposites showed lower mechanical properties compared to their pure polymers. However, the PLA-PEG-PLA/SCG biocomposites were still more flexible than the PLA/SCG biocomposites. The incorporated SCG accelerated the biodegradation in burial soil of both the biocomposite types. The results demonstrate the potential of PLA-PEG-PLA/SCG biocomposites as flexible and biodegradable packaging materials.