Mechanical properties analysis and prediction of glass fiber reinforced wheat straw fiber/polylactic acid composites

doi:10.19936/j.cnki.2096-8000.20260128.002

Abstract

Abstract: In order to study the effect of glass fiber (GF) on the mechanical properties of wheat straw fiber/polylactic acid (WSF/PLA) composite, glass fiber reinforced wheat straw fiber/polylactic acid (GFWSF/PLA) composites were prepared and analyzed using tensile tests, differential scanning calorimetry (DSC), and Micro-CT scanning. The results show that GF can effectively transfer and withstand loads, so the mechanical properties of hybrid composites are significantly improved. After adding 25% of GF, the tensile strength of the composite reaches 52.4 MPa (compared with the WSF/PLA composite by more than 40%), and within a certain range, the mechanical properties of the composites gradually increase with the increase of GF content. Both WSF and GF can increase the glass transition temperature (T_g) of the composite to 63.22 ℃ and 67.43 ℃, respectively, compared with 61.62 ℃ of pure PLA, which improves the heat resistance of the composite. The addition of WSF and GF also reduces the cold crystallization temperature (T_cc) of the composite from 95.03 ℃ to 90.00 ℃ for pure PLA, which makes the composite easier to crystallize. Micro-CT can effectively extract the distribution characteristics of GF in the matrix. Combined with the fitting function of Micro-CT results, test results, and the Halpin-Tsai empirical formula, a mechanical properties prediction model considering the real fiber distribution inside the composite was established, and the mechanical properties prediction of glass fiber-straw fiber-polylactic acid three-phase composite was realized.

Key words: glass fiber, wheat straw fiber, polylactic acid, mechanical properties, CT scan, composites

CLC Number:

TB332

MU Wenlong, ZHANG Shikun, LI Shijie, CHEN Liangyu, JIANG Junwei. Mechanical properties analysis and prediction of glass fiber reinforced wheat straw fiber/polylactic acid composites[J]. COMPOSITES SCIENCE AND ENGINEERING, 2026, 0(1): 9-15.

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