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| 硬脂酸-CaCO3协同改性对植物纤维/聚乳酸复合材料力学性能的影响 |
| Effect of Stearic Acid-Calcium Carbonate Synergistic Modification on the Mechanical Properties of Plant Fiber /Polylactic Acid Composites |
| 收稿日期：2023-10-16 |
| DOI：10.11980/j.issn.0254-508X.2024.04.015 |
| 关键词: 植物纤维 聚乳酸 硬脂酸钙 力学性能 |
| Key Words:plant fiber polylactic acid calcium stearate mechanical properties |
| 基金项目:广东省自然科学基金（2021A1515011263）。 |
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| 摘要:以硬脂酸、CaCl2、NaHCO3和NaOH为原料，对植物纤维进行硬脂酸-CaCO3协同改性，在纤维表面沉积CaCO3颗粒和疏水的硬脂酸钙层，并通过造纸法制备改性植物纤维/聚乳酸（PLA）复合材料。结果表明，协同改性生成的硬脂酸钙包裹了CaCO3颗粒并覆盖在植物纤维表面，提高了纤维的疏水性，复合材料的力学性能随c(硬脂酸)∶c(NaHCO3)的增加而先增加后减小；反应温度对复合材料强度影响较小；复合材料的抗张指数和耐破指数随c(NaOH)∶c(NaHCO3)的增加而先增加后减小，耐折度则持续减小；最佳改性条件为：c(硬脂酸)∶c(NaHCO3)∶c(NaOH)=4∶6∶6、反应温度75 ℃，此时制备的复合材料抗张指数、耐破指数和耐折度分别为51.0 N·m/g、3.56 kPa·m2/g、244次。 |
| 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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