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Supercritical fluid flame-retardant processing of polyethylene terephthalate (PET) fiber treated with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO): Changes in physical properties and flame-retardant performance

Title
Supercritical fluid flame-retardant processing of polyethylene terephthalate (PET) fiber treated with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO): Changes in physical properties and flame-retardant performance
Authors
Oh, JiyeonKim, Sam SooLee, JaewoongKang, Chankyu
DGIST Authors
Oh, Jiyeon; Kim, Sam Soo; Lee, Jaewoong; Kang, Chankyu
Issue Date
2021-12
Citation
Journal of CO2 Utilization, 54
Type
Article
Author Keywords
Flame-retardancyPETSupercritical CO2Washing durabilityDOPO
Keywords
Flame-retardancyLimiting Oxygen IndexAdditivesCarbon dioxideDeteriorationDurabilityEffluent treatmentPhosphorusPhysical propertiesPlastic bottlesPolyethylene terephthalatesSupercritical fluid extractionSupercritical fluidsTensile strengthWashing9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxideEco-friendlyNon-smooth surfacePerformancePolyethylene terephthalate fibersStrength and elongationsSupercritical CO 2Washing durabilityFibers
ISSN
2212-9820
Abstract
An eco-friendly flame-retardant process was employed to impart flame-retardant characteristics to polyethylene terephthalate (PET) fibers by treating these with a phosphorus-based flame retardant, 910-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), using supercritical CO2 as a solvent. DOPO was applied to the PET fibers without any other additives. The concentration of DOPO was changed from 1% o.w.f. to 9% o.w.f., and it was applied for 60 min at 120 °C and 25 MPa. As the DOPO concentration increased, many particles attached to the surface, creating a non-smooth surface. The phosphorous component increased with an increase in the amount of DOPO applied to the PET fiber, without the deterioration of physical properties such as tensile strength and elongation at break. When the sample was treated with 5% o.w.f DOPO, the char length decreased significantly, and the after-flame time was not observed. The limiting oxygen index (LOI) of ≥29 indicated excellent flame-retardant performance. Washing up to 50 times did not deteriorate the flame-retardant performance, as indicated by the retention of the LOI value of ≥29. Therefore, the PET fibers treated with DOPO using supercritical CO2 showed excellent washing durability and flame retardancy. © 2021 Elsevier Ltd
URI
http://hdl.handle.net/20.500.11750/15741
DOI
10.1016/j.jcou.2021.101761
Publisher
Elsevier Ltd
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