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<p>The thermal degradation of poly (lactic acid) (PLA) with the incorporation of different amounts of cellulose acetate (CA) (0–10% by weight) was investigated. The samples were heated using a thermogravimetric analyzer (TGA) at a heating rate of 10 °C/min in the presence of N2. The Coats–Redfern model was used to examine the data. According to the results, the PLA had higher thermal stability than pure CA and its blends, while the 10% CA had the highest thermal stability among other blends. The degradation rates of 10% CA and 7.5% CA blends were the highest, while the PLA degradation rate was higher than CA and its blends. The best-fitting models to represent the thermal degradation of pure CA, and the 2.5 and 5% blends were a first-order reaction, R2, and D4 models. The D3 model represents the thermal degradation of Pure PLA and 7.5% CA and 10% CA blends. The results observed that the highest activation energy was in the 10% CA blend (321.27 kJ/mol). The positive enthalpy and Gibbs free energy values confirmed that the degradation process was non-spontaneous and required external energy. The results of entropy revealed that the degradation products were more ordered than the original polymer chains. It was concluded that a simple kinetic model can describe the degradation of PLA, CA, and their blends.</p>

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Thermal, kinetic, and thermodynamic properties of polylactic acid/cellulose acetate blend for packaging application

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • Ismaeel M. Alwaan,
  • Ibrahem I. Moslam

摘要

The thermal degradation of poly (lactic acid) (PLA) with the incorporation of different amounts of cellulose acetate (CA) (0–10% by weight) was investigated. The samples were heated using a thermogravimetric analyzer (TGA) at a heating rate of 10 °C/min in the presence of N2. The Coats–Redfern model was used to examine the data. According to the results, the PLA had higher thermal stability than pure CA and its blends, while the 10% CA had the highest thermal stability among other blends. The degradation rates of 10% CA and 7.5% CA blends were the highest, while the PLA degradation rate was higher than CA and its blends. The best-fitting models to represent the thermal degradation of pure CA, and the 2.5 and 5% blends were a first-order reaction, R2, and D4 models. The D3 model represents the thermal degradation of Pure PLA and 7.5% CA and 10% CA blends. The results observed that the highest activation energy was in the 10% CA blend (321.27 kJ/mol). The positive enthalpy and Gibbs free energy values confirmed that the degradation process was non-spontaneous and required external energy. The results of entropy revealed that the degradation products were more ordered than the original polymer chains. It was concluded that a simple kinetic model can describe the degradation of PLA, CA, and their blends.