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Effect of Stearic Acid-Calcium Carbonate Synergistic Modification on the Mechanical Properties of Plant Fiber /Polylactic Acid Composites |
Received:October 16, 2023 |
DOI:10.11980/j.issn.0254-508X.2024.04.015 |
Key Words:plant fiber polylactic acid calcium stearate mechanical properties |
Fund Project:广东省自然科学基金(2021A1515011263)。 |
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Abstract:Taking the stearic acid, CaCl2, NaHCO3 and NaOH were raw materials, the plant fiber was co-modified with stearic acid and calcium carbonate in this study. CaCO3 particles and hydrophobic calcium stearate layer were deposited on the surface of plant fiber, then the modified plant fiber and polylactic acid were prepared into composites by a papermaking process. The results showed that calcium stearate encapsulated CaCO3 particles and covered the surface of plant fiber, which improved the hydrophobicity of fiber. With the increase of c(stearic acid)∶c(NaHCO3), the mechanical properties of the composites first increased and then decreased. The reaction temperature had little effect on the mechanical properties of the composites. With the increase of c(NaOH)∶c(NaHCO3), the tensile index and bursting index of the composites first increased and then decreased, while the folding endurance continued to decrease. The best modification conditions were c(stearic acid)∶c(NaHCO3)∶c(NaOH)=4∶6∶6 at 75 ℃. Under optimum conditions, the tensile index, bursting index and folding endurance of prepared composites were 51.0 N·m/g, 3.56 kPa·m2/g and 244 times, respectively. |
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