Natural fibre (NF) is considered as the most available resource that exists in nature. Date palm trees (DPT) accounts for more than 2.8 million tons of waste annually, making it the most abundant agricultural biomass waste in the MENA region. Date palm fibre (DPF) extracted from DPT possesses great mechanical and physical characteristics which make them superior to other NFs in the MENA region. This study investigates the effect of DPF diameter size and loading content on both the mechanical and physical properties of DPF reinforced recycled polyvinyl chloride (RPVC) composite. The composites are developed using melt-mixing technique which is followed by compression moulding. The influence of the mechanical properties is investigated by evaluating the impact strength, tensile strength and flexural strength. Meanwhile the sieve analysis, thickness swelling (TS), moisture content (MC) and water absorption (WA) characteristics are evaluated. Composite microstructures are examined using optical microscopy to investigate the interfacial bonding between DPF and RPVC matrix. Results showed that at 40 wt% DPF, the TS, MC and WA were the highest demonstrating an increase of 1.57%, 1.76%, and 10.80%, respectively. The flexural strength, tensile strength and impact strength decreased as the loading content increased showing maximum reduction at 40 wt% loading, varying depending on DPF geometry. Although the results demonstrated a decrease in mechanical properties and an increase in physical properties as DPF loading increased depending on DPF geometry, the results indicate a great potential that the developed technologies could be industrialised under the waste management scheme for non-structural applications.

天然纤维（NF）被认为是自然界中存在的最可利用的资源。椰枣树 (DPT) 每年产生超过 280 万吨的废物，使其成为 MENA 地区最丰富的农业生物质废物。从 DPT 中提取的椰枣纤维 (DPF) 具有出色的机械和物理特性，使其优于 MENA 地区的其他 NF。本研究调查了 DPF 直径大小和负载量对 DPF 增强再生聚氯乙烯 (RPVC) 复合材料机械和物理性能的影响。复合材料是使用熔融混合技术开发的，然后是压缩成型。通过评估冲击强度、拉伸强度和弯曲强度来研究机械性能的影响。同时进行筛分分析，评估厚度膨胀 (TS)、水分含量 (MC) 和吸水率 (WA) 特性。使用光学显微镜检查复合微结构，以研究 DPF 和 RPVC 基体之间的界面结合。结果表明，在 40 wt% DPF 下，TS、MC 和 WA 最高，分别增加了 1.57%、1.76% 和 10.80%。弯曲强度、拉伸强度和冲击强度随着负载含量的增加而降低，在 40 wt% 的负载下显示出最大的降低，这取决于 DPF 的几何形状。尽管结果表明，随着 DPF 负载的增加，机械性能会降低，而物理性能会随着 DPF 几何形状的增加而增加，