硬脂酸-CaCO_(3)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

作　　者：黄艳志 冯郁成[1] 吴树颖 高琪雅 饶婉月 董昕睿 杨飞[1] HUANG Yanzhi;FENG Yucheng;WU Shuying;GAO Qiya;RAO Wanyue;DONG Xinrui;YANG Fei(State Key Lab of Pulp and Papermaking Engineering,South China University of Technology,Guangzhou,Guangdong Province,510640)

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《中国造纸》2024年第4期130-139,共10页China Pulp & Paper

基　　金：广东省自然科学基金(2021A1515011263)。

摘　　要：以硬脂酸、CaCl_(2)、NaHCO_(3)和NaOH为原料,对植物纤维进行硬脂酸-CaCO_(3)协同改性,在纤维表面沉积CaCO_(3)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CaCO_(3)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(NaHCO_(3))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(NaHCO_(3))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(NaHCO_(3))∶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·m^(2)/g、244次。Taking the stearic acid,CaCl_(2),NaHCO_(3) and NaOH were raw materials,the plant fiber was co-modified with stearic acid and calcium carbonate in this study.CaCO_(3) 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 stea⁃rate encapsulated CaCO_(3) particles and covered the surface of plant fiber,which improved the hydrophobicity of fiber.With the increase of c(stearic acid)∶c(NaHCO_(3)),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(NaHCO_(3)),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(NaHCO_(3))∶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·m^(2)/g and 244 times,respectively.

关 键 词：植物纤维 聚乳酸 硬脂酸钙 力学性能 

分 类 号：TS76[轻工技术与工程—制浆造纸工程]