Effects of NaOH / NaCl pretreatment on the properties of rape straw flour /PVC composites

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2025-05-14 DOI:10.1016/j.coco.2025.102455

Zhongqing Yang, Keping Zhang, Yang Zhang, Junqian Yang, Yanan Zhang, Xi Zhang

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Abstract

In order to improve the interface compatibility between plant fibers and polymer matrix and enhance the performance of wood plastic composites (WPCs), sodium hydroxide (NaOH) and sodium chloride (NaCl) were used to modify rape straw, and the rape straw flour/polyvinyl chloride (RSF/PVC) composites were prepared by the single-screw extrusion method. The chemical composition, crystal structure and thermal stability of the composites were analyzed by FTIR, XRD and TG, and the microstructure, physics, mechanics, fire resistance, abrasive wear and water absorption performance of the composites were characterized. The results showed that the chemical composition of the composites was not significantly affected by pretreatments. The composites treated with NaCl have higher crystallinity, and the thermal stability and fire resistance are better than treated with NaOH. The tensile strength and bending strength of the composites treated with 5 % NaOH reached the optimum, which were 30.35 MPa and 56.87 MPa respectively. The maximum impact strength of the composites treated with 7 % NaCl was 5.48 kJ/m², and the combustion mass loss rate, specific wear rate and water absorption rate were the lowest, which were 26.40 %, 2.08 × 10⁻² mm³ (N m)⁻¹ and 7.55 % respectively. Therefore, salt treatment is a potential and more environmentally friendly pretreatment method to improve the properties of WPCs.

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NaOH / NaCl预处理对油菜秸秆粉/PVC复合材料性能的影响

为了改善植物纤维与聚合物基体的界面相容性，提高木塑复合材料（WPCs）的性能，采用氢氧化钠（NaOH）和氯化钠（NaCl）对油菜秸秆进行改性，采用单螺杆挤出法制备了油菜秸秆粉/聚氯乙烯（RSF/PVC）复合材料。采用FTIR、XRD和TG分析了复合材料的化学成分、晶体结构和热稳定性，并对复合材料的微观结构、物理力学性能、耐火性能、磨粒磨损性能和吸水性能进行了表征。结果表明，预处理对复合材料的化学成分影响不显著。NaCl处理的复合材料结晶度较高，热稳定性和耐火性能优于NaOH处理的复合材料。复合材料经5% NaOH处理后的抗拉强度和抗弯强度达到最佳，分别为30.35 MPa和56.87 MPa。7% NaCl处理的复合材料的最大冲击强度为5.48 kJ/m2，燃烧质量损失率、比磨损率和吸水率最低，分别为26.40%、2.08 × 10−2 mm3 (N m)−1和7.55%。因此，盐处理是一种有潜力且更环保的预处理方法，可以改善wpc的性能。

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

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.