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<p>To meet the growing industrial demand for strong, lightweight materials capable of performing in harsh environments, this study employs selective laser Sintering (SLS) technology to fabricate a novel PLA/HDPE/SiO<sub>2</sub>/GPN nanocomposite with higher tensile modulus and impact strength due to improved interfacial adhesion and good nanoparticle dispersion. Response surface methodology (RSM) in combination with desirability function analysis (DFA) was employed to optimize key process parameters of laser power, scan rate, and GPN/SiO<sub>2</sub> nanoparticle content. The nanocomposite was characterized using TGA, DSC, SEM, and frequency sweep tests to assess its thermal, rheological, and microstructural properties. Results indicated that adding GPN and SiO<sub>2</sub> nanoparticles improved thermal stability of PLA/HDPE/SiO<sub>2</sub>/GPN nanocomposite by 12% over pure PLA/HDPE blend. Microstructural analysis revealed that the effective distribution of 2 wt.% nanoparticles within the nanocomposite resulted in a 29% enhancement of the tensile modulus and a 10% improvement in impact strength. The optimal parameters, yielding a 95% overall desirability with enhanced tensile modulus and impact strength, were determined to be 1.8 wt.% GPN, 1.9 wt.% SiO<sub>2</sub>, a laser power of 16.5 W, and a scanning speed of 2620 mm/s.</p>

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Response Surface Methodology-Based Optimization of the Tensile Modulus, Impact Strength, Thermal Stability, and Rheology in a Selective Laser Sintering-Fabricated PLA/HDPE/SiO2/GPN Nanocomposite

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Alaauldeen A. Duhduh,
  • Hussam H. Noor

摘要

To meet the growing industrial demand for strong, lightweight materials capable of performing in harsh environments, this study employs selective laser Sintering (SLS) technology to fabricate a novel PLA/HDPE/SiO2/GPN nanocomposite with higher tensile modulus and impact strength due to improved interfacial adhesion and good nanoparticle dispersion. Response surface methodology (RSM) in combination with desirability function analysis (DFA) was employed to optimize key process parameters of laser power, scan rate, and GPN/SiO2 nanoparticle content. The nanocomposite was characterized using TGA, DSC, SEM, and frequency sweep tests to assess its thermal, rheological, and microstructural properties. Results indicated that adding GPN and SiO2 nanoparticles improved thermal stability of PLA/HDPE/SiO2/GPN nanocomposite by 12% over pure PLA/HDPE blend. Microstructural analysis revealed that the effective distribution of 2 wt.% nanoparticles within the nanocomposite resulted in a 29% enhancement of the tensile modulus and a 10% improvement in impact strength. The optimal parameters, yielding a 95% overall desirability with enhanced tensile modulus and impact strength, were determined to be 1.8 wt.% GPN, 1.9 wt.% SiO2, a laser power of 16.5 W, and a scanning speed of 2620 mm/s.