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<p>Two bio-based plasticizers derived from castor oil: raw butyl ricinoleate (RBR) and castor oil glycidyl ether (COGE) were used to plasticize polylactic acid (PLA) by one-step melt blending method. Compatibility analyses revealed that the generation of the branched products between epoxide groups of COGE and carboxyl groups of residual ricinoleic acid (RA) in the RBR and PLA improved the compatibility of the blends. The blends were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), rheology, thermogravimetry (TG), differential scanning calorimetry (DSC), polarized light microscopy (PLM), contact angle measurement and tensile test. The results showed that COGE could act as a compatibilizer and interact with carboxyl groups in RBR and PLA, significantly improving the interfacial compatibility, thermal stability and ductility of the blends. The generation of the entanglements among the molecular chains weakened the crystallization capacity of the ternary blends. The extension of molecular chains and entanglement of branched chains also increased the viscosity of the blends. Thanks to the synergistic application of RBR and COGE, the strain at break of PLA/RBR/COGE (85/3.75/11.25) blends reached 146%, which was 14.9 times larger than that of pure PLA. These blends presented excellent mechanical performance and processing ability, and thus have application scenarios in biodegradable packages and articles.</p> Graphical Abstract <p></p>

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Plasticization of Poly(lactic acid) by Bio-based Plasticizers Derived from Castor Oil

  • 期刊论文

  • 发表日期：

    2025年5月23日

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  • Yi-jie Yang,
  • Qiang Dou

摘要

Two bio-based plasticizers derived from castor oil: raw butyl ricinoleate (RBR) and castor oil glycidyl ether (COGE) were used to plasticize polylactic acid (PLA) by one-step melt blending method. Compatibility analyses revealed that the generation of the branched products between epoxide groups of COGE and carboxyl groups of residual ricinoleic acid (RA) in the RBR and PLA improved the compatibility of the blends. The blends were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), rheology, thermogravimetry (TG), differential scanning calorimetry (DSC), polarized light microscopy (PLM), contact angle measurement and tensile test. The results showed that COGE could act as a compatibilizer and interact with carboxyl groups in RBR and PLA, significantly improving the interfacial compatibility, thermal stability and ductility of the blends. The generation of the entanglements among the molecular chains weakened the crystallization capacity of the ternary blends. The extension of molecular chains and entanglement of branched chains also increased the viscosity of the blends. Thanks to the synergistic application of RBR and COGE, the strain at break of PLA/RBR/COGE (85/3.75/11.25) blends reached 146%, which was 14.9 times larger than that of pure PLA. These blends presented excellent mechanical performance and processing ability, and thus have application scenarios in biodegradable packages and articles.

Graphical Abstract