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<p>In this study, varying concentrations of China root powder (CRP) were blended with poly lactic acid (PLA) in 0–25% to evaluate their impact on the properties of biofilms. Thermogravimetric analyses revealed that biofilm containing 20% CRP/PLA exhibited the highest thermal mortification temperature of 333.57&#xa0;°C with 65% loss in mass indicating significant improvement in physical stability compared to other samples. At a 25% CRP concentration, the thermal degradation temperature slightly decreased to 329.76&#xa0;°C with a 68% mass loss, suggesting that excessive CRP may compromise stability. Fourier-transform infrared spectroscopy revealed enhanced surface properties in the CRP/PLA composite films, with spectral data indicating increased hydrophilic characteristics and more sophisticated molecular organization compared to conventional materials. X-ray diffraction (XRD) analysis indicated enhanced crystallinity in the 20% CRP/PLA biofilm, with the diffraction peak shifting from 20.31° (PLA) in pure PLA to 23.30° (25%) in the CRP/PLA blend. The Crystallite size continued to level up from 20&#xa0;nm of pure PLA to 38&#xa0;nm of CRP/PLA at 20% loading, down to 35&#xa0;nm of CRP/PLA at 25% loading. Atomic force microscopy results showed that the 20% CRP/PLA biofilm exhibited the most consistent surface roughness, indicating improved surface stability. Biodegradation tests revealed that the 20% CRP/PLA biofilm lost 34% of its mass within 20 days, highlighting its superior biodegradability compared to pure PLA. Water absorption tests further confirmed that the 20% CRP/PLA film had an optimal balance of moisture uptake. Additionally, XRD analysis showed enhanced crystallization in the CRP/PLA blend, with the peak shifting from 20.31° for pure PLA to 25.14° in the blend. The elastic modulus and tensile strength were maximum at 49.85 GPa and 23.32&#xa0;MPa respectively, when CRP was added at 20% level. Among all the tested samples, the 20% CRP/PLA biofilm demonstrated superior thermal stability, improved crystallinity, effective biodegradation, and robust mechanical properties, making it the most versatile and high-performing blend in this study.</p>

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Performance Evaluation of Eco-Friendly Biocomposite Films Prepared on PLA and China Root Powder

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • D. Palani Kumar,
  • S. S. Saravanakumar,
  • M. Prithiviraj,
  • R. Murugan

摘要

In this study, varying concentrations of China root powder (CRP) were blended with poly lactic acid (PLA) in 0–25% to evaluate their impact on the properties of biofilms. Thermogravimetric analyses revealed that biofilm containing 20% CRP/PLA exhibited the highest thermal mortification temperature of 333.57 °C with 65% loss in mass indicating significant improvement in physical stability compared to other samples. At a 25% CRP concentration, the thermal degradation temperature slightly decreased to 329.76 °C with a 68% mass loss, suggesting that excessive CRP may compromise stability. Fourier-transform infrared spectroscopy revealed enhanced surface properties in the CRP/PLA composite films, with spectral data indicating increased hydrophilic characteristics and more sophisticated molecular organization compared to conventional materials. X-ray diffraction (XRD) analysis indicated enhanced crystallinity in the 20% CRP/PLA biofilm, with the diffraction peak shifting from 20.31° (PLA) in pure PLA to 23.30° (25%) in the CRP/PLA blend. The Crystallite size continued to level up from 20 nm of pure PLA to 38 nm of CRP/PLA at 20% loading, down to 35 nm of CRP/PLA at 25% loading. Atomic force microscopy results showed that the 20% CRP/PLA biofilm exhibited the most consistent surface roughness, indicating improved surface stability. Biodegradation tests revealed that the 20% CRP/PLA biofilm lost 34% of its mass within 20 days, highlighting its superior biodegradability compared to pure PLA. Water absorption tests further confirmed that the 20% CRP/PLA film had an optimal balance of moisture uptake. Additionally, XRD analysis showed enhanced crystallization in the CRP/PLA blend, with the peak shifting from 20.31° for pure PLA to 25.14° in the blend. The elastic modulus and tensile strength were maximum at 49.85 GPa and 23.32 MPa respectively, when CRP was added at 20% level. Among all the tested samples, the 20% CRP/PLA biofilm demonstrated superior thermal stability, improved crystallinity, effective biodegradation, and robust mechanical properties, making it the most versatile and high-performing blend in this study.