含氟量和炭黑负荷对CO2管道输送用含氟弹性体的影响

IF 4.7 2区 化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Anu Muthukamatchi*, Ben Alcock* and Reidar Lund, 
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引用次数: 0

摘要

氟弹性体(fkm)因其耐化学性和热稳定性而广泛应用于油田密封,但其在液态二氧化碳(LCO2)条件下的性能仍未得到充分了解。本研究研究了两种fkm,一种共聚物(FKM1)和一种三元共聚物(FKM2),每种共聚物的炭黑(CB)的负载量分别为0、25和37.5% wt %,暴露于23±2°C和58±2 bar的液态CO2下的性能,这是典型的CO2管道运输条件的代表。通过原位膨胀测量以及暴露前后的差示扫描量热法(DSC)、热重分析(TGA)、拉伸测试和压缩集(CS)对化合物进行了表征。利用扫描电镜(SEM)对低温断裂样品进行形态学评价。结果表明,与FKM1相比,FKM2具有更高的氟含量和预估交联密度,在减压过程中和之后具有更低的肿胀,提高了尺寸恢复,并且在CO2暴露后具有更稳定的力学性能。炭黑的加入减少了二氧化碳引起的快速气体减压(RGD)效应,提高了抗拉强度和刚度,同时降低了高填料负荷下的弹性恢复。广角x射线散射(WAXS)显示两种FKM类型暴露于LCO2后聚合物结构的变化可以忽略不计。总的来说,这项研究强调,在选择用于二氧化碳传输应用的氟化弹性体时,交联密度、氟含量和炭黑负载等因素是重要的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of Fluorine Content and Carbon Black Loadings on Fluoroelastomers for CO2 Pipeline Transport

Fluoroelastomers (FKMs) are widely used in oilfield seals due to their chemical resistance and thermal stability, yet their performance under liquid carbon dioxide (LCO2) conditions remains insufficiently understood. This study investigates the performance of two FKMs, a copolymer (FKM1) and a terpolymer (FKM2), each formulated with carbon black (CB) loadings of 0, 25, and 37.5 wt %, under exposure to liquid CO2 at 23 ± 2 °C and 58 ± 2 bar, which are representative of typical CO2 pipeline transport conditions. The compounds were characterized through in-situ swelling measurements and, before and after exposure, using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), tensile testing, and compression set (CS). Morphological evaluation was conducted using scanning electron microscopy (SEM) on cryogenically fractured samples. The results show that FKM2, which contains higher fluorine content and estimated cross-linking density, exhibits lower swelling during and after decompression, improved dimensional recovery, and more stable mechanical performance following CO2 exposure compared to FKM1. The addition of CB reduces CO2-induced rapid gas decompression (RGD) effects and increases tensile strength and stiffness, while reducing elastic recovery at higher filler loadings. Wide-angle X-ray scattering (WAXS) shows negligible changes in polymer structure following exposure to LCO2 in both FKM types. Overall, this study highlights that factors such as cross-link density, fluorine content, and carbon black loading are important when selecting fluorinated elastomers for CO2 transport applications.

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来源期刊
CiteScore
7.20
自引率
6.00%
发文量
810
期刊介绍: ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.
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