Abstract
Thermoplastic lined composite pipes are broadly employed in transporting the oil and gas which contains H2S/CO2 due to its good corrosion resistance. However, permeation of gases of the frequently-used thermoplastics makes the liner at the risk of blister. This brings a hidden danger for safety of pipelines and environment. In order to understand the permeation behavior and mechanism of gases in thermoplastics and to present effective methods to prevent permeation, this paper studies the permeation behavior of a typical acid gas CO2 in high density polyethylene (HPDE), which is a widely used liner in composite pipes. Combined with analysis of morphology, composition and thermal resistance of the penetrated samples, the permeation mechanism was systematically investigated. The results showed that permeation coefficient of CO2 in HDPE increased with the increasing temperature. It is reveal that the mode of gas permeation was mainly physical process rather than chemical attack, because morphology, the composition and thermal resistance of the samples were not change obviously after the gas permeation. The diffusion coefficient obtained by molecular dynamics simulation was identical with the tested one, revealing that diffusion of CO2 in HDPE belongs to a normal diffusion (jumping between the cavities).
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Li, H. et al. (2018). Permeation Characteristic and Mechanism of CO2 in High Density Polyethylene. In: Han, Y. (eds) Advances in Materials Processing. CMC 2017. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-0107-0_93
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DOI: https://doi.org/10.1007/978-981-13-0107-0_93
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