ABSTRACTUSING HANSEN SOLUBILITY PARAMETERS (HSPs) TO DEVELOP ANTIOXIDANT-PACKAGING FILM TO ACHIEVE CONTROLLED RELEASEByJing GaoThe Hansen Solubility Parameters (HSPs) methodology was used to estimate the affinity between poly (butylene adipate-co-terephthalate) (PBAT) and 25 commonly used antioxidants. The HSPs of PBAT and the antioxidants were calculated by the Hoftyzer and Van Krevelen group contributions method, and the HSPs of PBAT were also experimentally determined. The HSPs of PBAT were δd =18.97 ± 0.30, δp =4.83 ± 0.75 and δh =9.10 ± 0.30. Of the selected 25 antioxidants, two antioxidants-α-tocopherol (α-TOC) and propyl gallate (PG), were incorporated into the PBAT matrix according to their likelihood to migrate from PBAT. Migration test at 10, 20, and 30℃ from the produced antioxidant films (α-TOC-PBAT (PBA) and PG-PBAT (PBP)) into 95% ethanol were conducted to verify the initial migration estimation. The Fick's diffusion equations were used to estimate the diffusion coefficients (D) and the mass of antioxidants release at equilibrium (M∞). The partition coefficients (〖 K〗_(P,S)) were determined from the M∞. D values obtained at all three temperatures for the two films were of the same order of magnitude (10-9 cm2/s) indicating a very fast release of α-TOC and PG from PBAT. Due to the fast release of the antioxidants from PBAT, the HSP method was not able to properly predict the likelihood of α-TOC and PG migration from the PBAT films. The activation energy (Ea) was determined by the Arrhenius equation, as 48.5kJ/mol for PBA film and 54.4kJ/mol for PBP film. The optical properties of PBA and PBP films are also reported in this study.
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