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<p>The effect of in situ condensation polymerization is studied in relation to the tensile strength, elongation-at-break, light transmittance, thermal stability, and antimicrobial properties of poly(lactic acid) (PLA) films through the modification of gum arabic (OLLA-<i>g</i>-GA) and <i>Euphorbia trigona</i> Mill using lactic acid oligomers (ETML-<i>g</i>-OLLA). During the synthesis of OLLA-<i>g</i>-GA and OLLA-<i>g</i>-ETML, the initially hydrophilic properties of gum arabic and <i>Euphorbia trigona</i> Mill latex were transformed into hydrophobic characteristics owing to the grafting of in situ synthesized hydrophobic lactic acid oligomers (OLLA). Following this, biocomposite films were prepared using the solution casting method with modified gum arabic, <i>Euphorbia trigona</i> Mill latex, and masterbatch dispersed. A blend of modified gum arabica and <i>Euphorbia trigona</i> Mill latex, referred to as a masterbatch, was used. Subsequently, biocomposite films of PLA/OLLA-<i>g</i>-GA, PLA/OLLA-<i>g</i>-ETML, and PLA/masterbatch were produced and analyzed for their mechanical, thermal, transmittance, and antimicrobial characteristics. The addition of OLLA-<i>g</i>-GA (3%), OLLA-<i>g</i>-ETML (5%), and masterbatch OLLA<i>-g</i>-GA (3%) and OLLA-<i>g</i>-ETML (5%) led to an enhancement in tensile strength by 38.31%, 10.47% and 47%, respectively. The elongation-at-break increased by 20.62%, 31% and 34% with the incorporation of OLLA-<i>g</i>-GA (3%), OLLA-<i>g</i>-ETML (5%), and a masterbatch composed of OLLA-<i>g</i>-GA (3%) and OLLA-<i>g</i>-ETML (5%), respectively. The thermal stability of PLA decreased after the addition of the masterbatch; this was due to the filler having a lower thermal stability than the PLA polymer. The antibacterial properties of the biocomposite films were tested against both Gram-positive and Gram-negative bacteria, revealing that the produced films exhibited a greater zone of inhibition, indicating their potential use as antimicrobial packaging materials.</p> Graphical abstract

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Study on the Effect of modified gum arabic, modified Euphorbia trigona Mill, and their masterbatch on the antimicrobial and mechanical performance of poly(lactic acid) films

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Kasahun Tsegaye Mekonnen,
  • Melaku Tesfaye Alemea,
  • Mulugta Yilma Tsegaye,
  • Birhanu Zeleke Tilinti

摘要

The effect of in situ condensation polymerization is studied in relation to the tensile strength, elongation-at-break, light transmittance, thermal stability, and antimicrobial properties of poly(lactic acid) (PLA) films through the modification of gum arabic (OLLA-g-GA) and Euphorbia trigona Mill using lactic acid oligomers (ETML-g-OLLA). During the synthesis of OLLA-g-GA and OLLA-g-ETML, the initially hydrophilic properties of gum arabic and Euphorbia trigona Mill latex were transformed into hydrophobic characteristics owing to the grafting of in situ synthesized hydrophobic lactic acid oligomers (OLLA). Following this, biocomposite films were prepared using the solution casting method with modified gum arabic, Euphorbia trigona Mill latex, and masterbatch dispersed. A blend of modified gum arabica and Euphorbia trigona Mill latex, referred to as a masterbatch, was used. Subsequently, biocomposite films of PLA/OLLA-g-GA, PLA/OLLA-g-ETML, and PLA/masterbatch were produced and analyzed for their mechanical, thermal, transmittance, and antimicrobial characteristics. The addition of OLLA-g-GA (3%), OLLA-g-ETML (5%), and masterbatch OLLA-g-GA (3%) and OLLA-g-ETML (5%) led to an enhancement in tensile strength by 38.31%, 10.47% and 47%, respectively. The elongation-at-break increased by 20.62%, 31% and 34% with the incorporation of OLLA-g-GA (3%), OLLA-g-ETML (5%), and a masterbatch composed of OLLA-g-GA (3%) and OLLA-g-ETML (5%), respectively. The thermal stability of PLA decreased after the addition of the masterbatch; this was due to the filler having a lower thermal stability than the PLA polymer. The antibacterial properties of the biocomposite films were tested against both Gram-positive and Gram-negative bacteria, revealing that the produced films exhibited a greater zone of inhibition, indicating their potential use as antimicrobial packaging materials.

Graphical abstract