Siddique Shohel, Novak Adam, Guliyev Emin, Yates Kyari, Leung Pak Sing, Njuguna James
Advanced Materials Research Group, School of Engineering, Robert Gordon University, Riverside East, Garthdee Road, Aberdeen AB10 7GJ, UK.
School of Pharmacy and Life Sciences, Robert Gordon University, Aberdeen AB10 7GJ, UK.
Polymers (Basel). 2022 Apr 2;14(7):1455. doi: 10.3390/polym14071455.
Traditionally, the drilling waste generated in oil and gas exploration operations, including spent drilling fluid, is disposed of or treated by several methods, including burial pits, landfill sites and various thermal treatments. This study investigates drilling waste valorisation and its use as filler in polymer composites. The effect of the poor particle/polymer interfacial adhesion bonding of the suspended clay in oil-based mud (OBM) slurry and the LDPE matrix is believed to be the main reason behind the poor thermo-mechanical and mechanical properties of low-density polyethylene (LDPE)/OBM slurry nanocomposites. The thermo-mechanical and mechanical performances of LDPE)/OBM slurry nanocomposites without the clay surface treatment and without using compatibilizer are evaluated and discussed. In our previous studies, it has been observed that adding thermally treated reclaimed clay from OBM waste in powder form improves both the thermal and mechanical properties of LDPE nanocomposites. However, incorporating OBM clay in slurry form in the LDPE matrix can decrease the thermal stability remarkably, which was reported recently, and thereby has increased the interest to identify the mechanical response of the composite material after adding this filler. The results show the severe deterioration of the tensile and flexural properties of the LDPE/OBM slurry composites compared to those properties of the LDPE/MMT nanocomposites in this study. It is hypothesised, based on the observation of the different test results in this study, that this deterioration in the mechanical properties of the materials was associated with the poor Van der Waals force between the polymer molecules/clay platelets and the applied force. The decohesion between the matrix and OBM slurry nanoparticles under stress conditions generated stress concentration through the void area between the matrix and nanoparticles, resulting in sample failure. Interfacial adhesion bonding appears to be a key factor influencing the mechanical properties of the manufactured nanocomposite materials.
传统上，石油和天然气勘探作业中产生的钻井废弃物，包括废钻井液，通过多种方法进行处置或处理，包括掩埋坑、垃圾填埋场和各种热处理方法。本研究调查钻井废弃物的增值利用及其作为聚合物复合材料填料的用途。油基泥浆（OBM）浆液中的悬浮粘土与低密度聚乙烯（LDPE）基体之间颗粒/聚合物界面粘结性差，被认为是导致低密度聚乙烯（LDPE）/OBM浆液纳米复合材料热机械性能和力学性能不佳的主要原因。对未进行粘土表面处理且未使用增容剂的LDPE/OBM浆液纳米复合材料的热机械性能和力学性能进行了评估和讨论。在我们之前的研究中，已经观察到添加粉末形式的经热处理的OBM废料回收粘土可改善LDPE纳米复合材料的热性能和力学性能。然而，最近有报道称，将OBM粘土以浆液形式掺入LDPE基体中会显著降低热稳定性，因此人们对添加这种填料后复合材料的力学响应产生了更大的兴趣。结果表明，与本研究中的LDPE/蒙脱土（MMT）纳米复合材料的性能相比，LDPE/OBM浆液复合材料的拉伸和弯曲性能严重恶化。基于本研究中不同测试结果的观察，推测材料力学性能的这种恶化与聚合物分子/粘土片层之间较弱的范德华力以及所施加的力有关。在应力条件下，基体与OBM浆液纳米颗粒之间的脱粘通过基体与纳米颗粒之间的空隙区域产生应力集中，导致样品失效。界面粘结似乎是影响所制备纳米复合材料力学性能的关键因素。
