Contribution of cellulose nanofibrils on the strengthening and toughening of neat and blended polylactide specimens; and the differences after 3D-printing

IF 3.6 4区材料科学 Q2 MATERIALS SCIENCE, COMPOSITES

Journal of Thermoplastic Composite Materials Pub Date : 2024-05-13 DOI:10.1177/08927057241241499

Burcu Sarı, Cevdet Kaynak

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Abstract

The main purpose of this study was to use “green materials” approach by investigating effects of only 1 wt% Cellulose Nanofibrils (CNF) on the strengthening and toughening of neat and blended polylactide (PLA) biopolymer matrix. For this purpose, first of all effects of CNF were investigated in PLA/CNF biocomposite specimens. After blending of PLA with 10 phr bio-based thermoplastic polyester (b-TPE) elastomer, effects of CNF were investigated also for this PLA/b-TPE/CNF ternary biocomposite specimens. Mechanical tests revealed that due to the efficient strengthening and toughening mechanisms, CNF increased flexural strength of PLA by 33%, while b-TPE increased fracture toughness of PLA by 104%. When CNF and b-TPE were incorporated together, synergism in the strength and toughness values were occurred. All bioblend and biocomposite specimens were produced by using the same “melt mixing” technique in a laboratory size twin-screw extruder, and their test specimens were shaped by conventional “compression molding”. Since shaping by “3D-printing” is frequently used in the biomedical sectors, another distinctive aim of this study was to reveal whether there were any differences in the strength and toughness values of specimens after their 3D-printing. It was observed that due to the “textured” structure of 3D-printed specimens, their flexural strength values were approximately 20% lower, while fracture toughness values were approximately 20% higher.

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纤维素纳米纤维对纯聚乳酸试样和混合聚乳酸试样的增强和增韧的贡献；以及三维打印后的差异

本研究的主要目的是采用 "绿色材料 "方法，研究仅 1 wt% 的纤维素纳米纤维 (CNF) 对纯聚乳酸（PLA）和混合聚乳酸（PLA）生物聚合物基体的增强和增韧效果。为此，首先研究了 CNF 对聚乳酸/CNF 生物复合材料试样的影响。在将聚乳酸与 10 phr 生物基热塑性聚酯 (b-TPE) 弹性体混合后，还研究了 CNF 对这种聚乳酸/b-TPE/CNF 三元生物复合材料试样的影响。机械测试表明，由于高效的强化和增韧机制，CNF 使聚乳酸的抗弯强度提高了 33%，而 b-TPE 使聚乳酸的断裂韧性提高了 104%。当将 CNF 和 b-TPE 结合在一起时，强度和韧性值产生了协同效应。所有生物粘合剂和生物复合材料试样都是在实验室大小的双螺杆挤出机中使用相同的 "熔融混合 "技术生产的，其试样采用传统的 "压缩成型 "方法成型。由于生物医学领域经常使用 "三维打印 "成型技术，本研究的另一个独特目的是揭示三维打印后试样的强度和韧性值是否存在差异。研究发现，由于 3D 打印试样的 "纹理 "结构，其抗弯强度值降低了约 20%，而断裂韧性值则提高了约 20%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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).