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<p>Alkali-silane treated pineapple fiber and <b>Polyethylene Terephthalate</b> (PET) core reinforced vinyl ester composites exhibit promising mechanical properties, making them suitable for building applications. However, water aging and temperature aging under different conditions led to decreased mechanical, flammability, thermal conductivity, and shear properties, with the alkali-silane treatment minimizing these reductions. Among the tested composites, SPH1 (temperature-aged at 50 ℃ for 50,000&#xa0;min) attained the highest tensile strength (158.2&#xa0;MPa), flexural strength (162&#xa0;MPa), impact strength (4.5&#xa0;J), and ILSS (16.2&#xa0;MPa) due to post-curing and polymer cross-linking, which enhanced fiber-matrix adhesion and load transmission. Conversely, the highest thermal conductivity (0.336&#xa0;W/mK) was observed in the unaged composite SP1 due to an intact fiber-matrix interface that facilitated efficient heat transfer. The lowest flame propagation speed (6.07&#xa0;mm/min) was recorded for SPR1 (rain water-aged) as absorbed moisture increased heat capacity, delaying ignition and acting as a natural flame retardant. SEM analysis provided an in-depth evaluation of the composites’ microstructure and surface topologies. The findings indicate that these composites possess strong mechanical properties and fire resistance, making them viable for structural and construction applications.</p>

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Load Bearing Performance of Alkali-Silane-Treated Pineapple Fiber and Polyethylene Terephthalate Core-Reinforced Sandwich Composite for Building Applications

  • 期刊论文

  • 发表日期：

    2025年9月6日

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  • Manoj Kumar S,
  • I. Saravanan,
  • Sumesh Rajesh Kannan,
  • V. R. Arun

摘要

Alkali-silane treated pineapple fiber and Polyethylene Terephthalate (PET) core reinforced vinyl ester composites exhibit promising mechanical properties, making them suitable for building applications. However, water aging and temperature aging under different conditions led to decreased mechanical, flammability, thermal conductivity, and shear properties, with the alkali-silane treatment minimizing these reductions. Among the tested composites, SPH1 (temperature-aged at 50 ℃ for 50,000 min) attained the highest tensile strength (158.2 MPa), flexural strength (162 MPa), impact strength (4.5 J), and ILSS (16.2 MPa) due to post-curing and polymer cross-linking, which enhanced fiber-matrix adhesion and load transmission. Conversely, the highest thermal conductivity (0.336 W/mK) was observed in the unaged composite SP1 due to an intact fiber-matrix interface that facilitated efficient heat transfer. The lowest flame propagation speed (6.07 mm/min) was recorded for SPR1 (rain water-aged) as absorbed moisture increased heat capacity, delaying ignition and acting as a natural flame retardant. SEM analysis provided an in-depth evaluation of the composites’ microstructure and surface topologies. The findings indicate that these composites possess strong mechanical properties and fire resistance, making them viable for structural and construction applications.