Study on polyethylene-based carbon fibers obtained by sulfonation under hydrostatic pressure

Autor:	Joon Seok Lee, Jong Hyun Eun
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	chemistry.chemical_classification Multidisciplinary Thermoplastic Materials science Science Hydrostatic pressure Polyethylene Article Linear low-density polyethylene chemistry.chemical_compound Engineering chemistry Ultimate tensile strength Medicine Fiber High-density polyethylene Composite material Melt flow index
Zdroj:	Scientific Reports, Vol 11, Iss 1, Pp 1-16 (2021) Scientific Reports
ISSN:	2045-2322
Popis:	Polyethylene based carbon fibers were studied using high density polyethylene(HDPE) fibers and linear low density polyethylene(LLDPE) fibers with various melt flow index. The draw ratio of the polyethylene fibers and the sulfonation mechanism were investigated under hydrostatic pressures of 1 and 5 bar in the first time. The influence of the melt flow index of polyethylene and types of polyethylene fibers on the sulfonation reaction was studied. Carbon fibers were prepared through the sulfonation of LLDPE fibers possessing side chains with a high melt flow index. The polyethylene fibers, which exhibited thermoplastic properties and plastic behavior, were cross-linked through the sulfonation process. Their thermal properties and mechanical properties changed to thermoset properties and elastic behavior. Although sulfonation was performed under a hydrostatic pressure of 5 bar, it was difficult to convert the highly oriented polyethylene fibers because of their high crystallinity, but partially oriented polyethylene fibers could be converted to carbon fibers. Therefore, the effect of fiber orientation on fiber crosslinking, which has not been reported in previous literature, has been studied in detail, and a new method of hydrostatic pressure sulfonation has been successful in thermally stabilizing polyethylene fiber. Hydrostatic sulfonation was performed using partially oriented LLDPE fibers with a melt flow index of 20 at 130 °C for 2.5 h under a hydrostatic pressure of 5 bar. The resulting fibers were carbonized under the following conditions: 1000 °C, 5 °C/min, and five minutes. Carbon fibers with a tensile strength of 2.03 GPa, a tensile modulus of 143.63 GPa, and an elongation at break of 1.42% were prepared.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4bc1a3d35d4913868bdf681039c1ba0b https://doaj.org/article/3bac446089b34fe6a0cc7085e54168e1 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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