以 2-乙酰柠檬酸三丁酯为增塑剂的剑麻纤维增强聚乳酸生物复合材料的机械、热和流变特性研究

IF 3.6 4区 材料科学 Q2 MATERIALS SCIENCE, COMPOSITES Journal of Thermoplastic Composite Materials Pub Date : 2024-02-26 DOI:10.1177/08927057241235649
Eshetie Kassegn, Belete Sirhabizu, Temesgen Berhanu, Bart Buffel, Frederik Desplentere
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引用次数: 0

摘要

本研究以聚乳酸(PLA)为基体,以龙舌兰剑麻叶提取的剑麻纤维(SF)为增强材料,开发了生物复合材料。生物复合材料通过注塑成型制备,并添加了 2-乙酰柠檬酸三丁酯(ATBC)增塑剂。研究了这些生物复合材料的机械、热和流变特性,以了解纤维和增塑剂含量的影响。结果表明,与纯聚乳酸相比,添加 SFs 提高了生物复合材料的拉伸和弯曲模量,但导致拉伸强度下降。纤维含量低时,抗弯强度最初会下降,但随着纤维含量的增加,抗弯强度会恢复到纯聚乳酸的水平。冲击强度随着 SFs 和 ATBC 的加入而增加。然而,ATBC 的存在对生物复合材料的拉伸和弯曲性能产生了负面影响。材料的热导率受纤维含量和加工温度的影响,加入 SFs 后热导率增加,而加入 ATBC 后热导率降低。差示扫描量热分析表明,随着 SFs 和 ATBC 的存在,聚乳酸的结晶度增加。比热容随 ATBC 的增加而增加,但随 SFs 的增加而降低。动态机械性能测试表明,生物复合材料在不同温度下的存储模量和损耗模量都有变化。储存模量随着纤维含量的增加而增加,并在玻璃化温度附近突然下降。流变特性分析表明,纤维与基体之间存在有效的相互作用,纤维分散性良好,因此在不同的毛细管尺寸下,剪切粘度与剪切速率的关系均匀一致。SFs/PLA 混合物的剪切粘度随着纤维含量的增加而增加,但随着增塑剂的添加而降低。此外,复合和成型工艺对纤维的微观结构也有显著影响,特别是在加工过程中导致纤维断裂和纤维分离。
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A study of the mechanical, thermal and rheological properties of sisal fiber-reinforced polylactic acid bio-composites with tributyl 2-acetylcitrate as a plasticizer
In this study, bio-composites were developed using polylactic acid (PLA) as the matrix and sisal fibers (SFs) derived from agave sisalana leaves as the reinforcement. The bio-composites were prepared through injection molding with the addition of tributyl 2-acetylcitrate (ATBC) plasticizer. The mechanical, thermal, and rheological properties of these bio-composites were investigated to understand the effects of fiber and plasticizer contents. The results showed that the addition of SFs improved the tensile and flexural moduli of the bio-composites but led to a decrease in tensile strength compared to neat PLA. The flexural strength initially decreased with low fiber content but recovered to the level of neat PLA as the fiber content increased. The impact strength increased with the incorporation of SFs and ATBC. However, the presence of ATBC had a negative impact on the tensile and flexural properties of the bio-composites. The thermal conductivity of the materials was influenced by the fiber content and processing temperature, increasing with SFs inclusion but decreasing with temperature. Differential scanning calorimetry analysis revealed increased crystallinity of PLA with the presence of SFs and ATBC. The specific heat capacity increased with ATBC but decreased with increasing SFs. Dynamic mechanical property testing showed variations in storage and loss moduli of the bio-composites at different temperatures. The storage modulus increased with higher fiber content and abruptly dropped around glass transition temperature. Rheological characterization demonstrated effective interactions between the fibers and matrix with good fiber dispersion, resulting in uniform shear viscosity versus shear rate for different capillary dimensions. The shear viscosity of the SFs/PLA mixture increased with increasing fiber content but decreased with the addition of plasticizer. Furthermore, the compounding and molding processes had a notable impact on the microstructure of the fibers, specifically resulting in fiber breakage and fiber separation during processing.
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来源期刊
Journal of Thermoplastic Composite Materials
Journal of Thermoplastic Composite Materials 工程技术-材料科学:复合
CiteScore
8.00
自引率
18.20%
发文量
104
审稿时长
5.9 months
期刊介绍: The Journal of Thermoplastic Composite Materials is a fully peer-reviewed international journal that publishes original research and review articles on polymers, nanocomposites, and particulate-, discontinuous-, and continuous-fiber-reinforced materials in the areas of processing, materials science, mechanics, durability, design, non destructive evaluation and manufacturing science. This journal is a member of the Committee on Publication Ethics (COPE).
期刊最新文献
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