Nukala Satya Guha, Kong Ing, Kakarla Akesh Babu, Tshai Kim Yeow, Kong Win
School of Computing, Engineering and Mathematical Sciences, La Trobe University, Bendigo, VIC 3552, Australia.
Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham Malaysia, Jalan Broga, Semenyih 43500, Selangor, Malaysia.
Polymers (Basel). 2022 Aug 4;14(15):3183. doi: 10.3390/polym14153183.
In recent years, composites consisting of polymers and cellulosic materials have attracted increasing research attention. Polypropylene (PP) is among the most common polymer types found in excavated waste from landfills. Moreover, wood waste generated from wood products manufacturing such as sawdust (SD) offers a good potential for the fabrication of composite materials, and it is readily available in the environment. In this paper, wood polymer composites (WPC) consisting of recycled PP (rPP) and (SD) were prepared and characterised. A range of mechanical properties, including tensile strength, flexural properties, creep and hardness were studied, along with morphology, thermal properties, water degradation and contact angle. The results showed that the mechanical and thermal properties of rPP increased with an increase in 40 wt% of the SD content. Furthermore, the SD content significantly influenced the water uptake of the composites. Time-temperature superposition (TTS) was applied to predict the long-term mechanical performance from short-term accelerated creep tests at a range of elevated temperatures. The short-term creep test showed efficient homogeneity between the fillers and matrix with increasing temperature. The produced wood polymer composites displayed a comparable physical property to virgin polymer and wood and could potentially be used for various structural materials.
近年来，由聚合物和纤维素材料组成的复合材料已引起越来越多的研究关注。聚丙烯（PP）是垃圾填埋场挖掘出的废弃物中最常见的聚合物类型之一。此外，木材制品制造过程中产生的木材废料，如锯末（SD），为复合材料的制造提供了良好的潜力，并且在环境中很容易获得。本文制备并表征了由回收聚丙烯（rPP）和锯末（SD）组成的木塑复合材料（WPC）。研究了一系列力学性能，包括拉伸强度、弯曲性能、蠕变和硬度，以及形态、热性能、水解降解和接触角。结果表明，rPP的力学性能和热性能随着SD含量增加40 wt%而提高。此外，SD含量显著影响复合材料的吸水率。采用时间-温度叠加（TTS）法，通过在一系列升高温度下的短期加速蠕变试验来预测长期力学性能。短期蠕变试验表明，随着温度升高，填料与基体之间具有良好的均匀性。所制备的木塑复合材料表现出与原始聚合物和木材相当的物理性能，并且有可能用于各种结构材料。
