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<p>In this study, poly(lactic acid)/poly(glycolic acid) (PLA/PGA) blends with varying PGA contents were prepared via twin-screw extrusion, in which PGA was used as reinforcing component to enhance the comprehensive performances of PLA. The influences of PGA content on processing torque, mechanical performances, microscopic morphology, crystallization property, thermal deformation resistance, gas barrier, and hydrolytic degradation behavior were investigated. The test results of variable temperature torque, tensile property, flexural property, and DMA, etc. show that the rigid PGA component has a significant reinforcing effect on the PLA materials. For instance, compared with pure PLA, the tensile modulus and tensile strength of the PLA/PGA (60/40) blend have increased by 783.2 MPa (an increase of 22.4%) and 11.1 MPa (an increase of 16.1%), respectively. The vicat softening temperature (VST) and thermal deformation tests show that PLA/PGA blends with higher PGA content, such as PLA with 40% PGA, exhibit significant improvement in thermal deformation resistance, with minimal deformation after 5 minutes in a <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10924_2025_3586_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="35" /> </InlineMediaObject> <EquationSource Format="TEX">\(100^{\,\circ }\)</EquationSource> </InlineEquation>C oil bath. Moreover, the incorporation of 40 wt.% PGA significantly enhances the barrier properties of PLA, reducing water vapor permeability (WVP) by 74% and oxygen permeability (OPC) by 86% compared with pure PLA, clearly highlighting the substantial improvement in PLA’s gas barrier performance with PGA. In comparison to the relatively slow hydrolysis rate of PLA, the incorporation of PGA leads to a notable increase in the hydrolysis rate of PLA/PGA blends in alkaline solutions (pH = 13, 37<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10924_2025_3586_Article_IEq2.gif" Format="GIF" Height="7" Rendition="HTML" Resolution="72" Type="Linedraw" Width="9" /> </InlineMediaObject> <EquationSource Format="TEX">\(\,^\circ\)</EquationSource> </InlineEquation>C). At 40 wt.% PGA, the PLA/PGA blend’s hydrolysis rate rises from 0.13 wt.%/h to 1.55 wt.%/h, with a 94.9% weight loss after 60 hours of immersion. In summary, the incorporation of the PGA component significantly enhances the comprehensive performance of the PLA blend, potentially further expanding its application fields and scenarios.&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;&#xa0;</p>

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Enhanced Physical Performances and Hydrolytic Degradation Characteristics of Poly(lactic acid) Blend Modified with Poly(glycolic acid)

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Kai Wang,
  • Weiguang Jia,
  • Jianing Shen,
  • Zhao Ma,
  • Nai Xu,
  • Lisha Pan,
  • Sujuan Pang

摘要

In this study, poly(lactic acid)/poly(glycolic acid) (PLA/PGA) blends with varying PGA contents were prepared via twin-screw extrusion, in which PGA was used as reinforcing component to enhance the comprehensive performances of PLA. The influences of PGA content on processing torque, mechanical performances, microscopic morphology, crystallization property, thermal deformation resistance, gas barrier, and hydrolytic degradation behavior were investigated. The test results of variable temperature torque, tensile property, flexural property, and DMA, etc. show that the rigid PGA component has a significant reinforcing effect on the PLA materials. For instance, compared with pure PLA, the tensile modulus and tensile strength of the PLA/PGA (60/40) blend have increased by 783.2 MPa (an increase of 22.4%) and 11.1 MPa (an increase of 16.1%), respectively. The vicat softening temperature (VST) and thermal deformation tests show that PLA/PGA blends with higher PGA content, such as PLA with 40% PGA, exhibit significant improvement in thermal deformation resistance, with minimal deformation after 5 minutes in a \(100^{\,\circ }\) C oil bath. Moreover, the incorporation of 40 wt.% PGA significantly enhances the barrier properties of PLA, reducing water vapor permeability (WVP) by 74% and oxygen permeability (OPC) by 86% compared with pure PLA, clearly highlighting the substantial improvement in PLA’s gas barrier performance with PGA. In comparison to the relatively slow hydrolysis rate of PLA, the incorporation of PGA leads to a notable increase in the hydrolysis rate of PLA/PGA blends in alkaline solutions (pH = 13, 37 \(\,^\circ\) C). At 40 wt.% PGA, the PLA/PGA blend’s hydrolysis rate rises from 0.13 wt.%/h to 1.55 wt.%/h, with a 94.9% weight loss after 60 hours of immersion. In summary, the incorporation of the PGA component significantly enhances the comprehensive performance of the PLA blend, potentially further expanding its application fields and scenarios.