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<p>Polylactic acid (PLA) is a widely used biodegradable polymer that exhibits favorable biocompatibility, biodegradability, mechanical properties, and processing characteristics, rendering it highly promising for diverse applications in packaging, medicine, textiles, and other industries. However, PLA exhibits inherent limitations, including elevated cost, the need for enhanced mechanical properties, and inadequate thermal stability, constraining its broader utility. In this study, waste straw was incorporated into PLA to fabricate composite materials using a green additive manufacturing technology. The filament diameter, thermal stability, flowability, density, compressive strength, thermal conductivity, shore hardness, water absorption, and inner characteristics of the straw/PLA composites under various straw contents were investigated. The results demonstrated a clear correlation between the increasing straw content and the flow properties of the composites. It is noteworthy that when the mass ratio of straw to PLA reached 90 wt%:10 wt%, the composite exhibited a melt flow rate (MFR) of 27.50&#xa0;g/10 min, density of 1.222&#xa0;g/cm<sup>3</sup>, a compressive strength of 304.25&#xa0;MPa at 70% deformation, hardness of 80.58 HD, decomposition temperature of 275.16&#xa0;°C, and thermal conductivity of 0.134&#xa0;W/(K•m), demonstrating the great thermal insulation performance. Green additive manufactured straw/PLA composites with 15 wt% content of straw exhibited an enhanced compressive strength during compaction.</p>

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Study on Preparing Method and Property Tailoring of Green Additive Manufactured Straw/PLA Polymer Composites

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Rui Wang,
  • Wenyuan Wang,
  • Yingcheng Wu,
  • Zhicai He,
  • Feng Zhang,
  • Jieren Guan

摘要

Polylactic acid (PLA) is a widely used biodegradable polymer that exhibits favorable biocompatibility, biodegradability, mechanical properties, and processing characteristics, rendering it highly promising for diverse applications in packaging, medicine, textiles, and other industries. However, PLA exhibits inherent limitations, including elevated cost, the need for enhanced mechanical properties, and inadequate thermal stability, constraining its broader utility. In this study, waste straw was incorporated into PLA to fabricate composite materials using a green additive manufacturing technology. The filament diameter, thermal stability, flowability, density, compressive strength, thermal conductivity, shore hardness, water absorption, and inner characteristics of the straw/PLA composites under various straw contents were investigated. The results demonstrated a clear correlation between the increasing straw content and the flow properties of the composites. It is noteworthy that when the mass ratio of straw to PLA reached 90 wt%:10 wt%, the composite exhibited a melt flow rate (MFR) of 27.50 g/10 min, density of 1.222 g/cm3, a compressive strength of 304.25 MPa at 70% deformation, hardness of 80.58 HD, decomposition temperature of 275.16 °C, and thermal conductivity of 0.134 W/(K•m), demonstrating the great thermal insulation performance. Green additive manufactured straw/PLA composites with 15 wt% content of straw exhibited an enhanced compressive strength during compaction.