期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 148, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2021.106477
关键词
Polymer nanocomposites; Polyacrylonitrile(PAN); Sulfur-doped reduced graphene oxide; Flame retardant; Thermal oxidative stabilization
资金
- Open Research Program (ORP) of Korea Institute of Science and Technology (KIST)
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2016M3A7B4027223, 2019R1A5A8080326]
Polyacrylonitrile (PAN)-based flame retardants with dihydroxy styrene monomers and catechol units were synthesized as high-flame retardants using an efficient thermal oxidative stabilization (TOS) process. Composite materials of PAN copolymers with graphene oxide (GO) and sulfur-doped reduced GO (SrGO) showed improved flame-retarding properties, attributed to the high char layer produced by TOS and radical scavenging effect of sulfur-functionalized SrGO. Incorporating SrGO into PAN copolymers with catechol units is a promising approach for developing environmentally friendly high-flame retardants.
Polyacrylonitrile (PAN)-based flame retardants have been investigated as environmentally friendly high-flame retarding materials. High-flame retarding properties can be achieved in PAN copolymers via efficient thermal oxidative stabilization (TOS). In this study, PAN copolymers of dihydroxy styrene monomers with simple catechol units were synthesized as high-flame retardants using an efficient TOS process. To further improve the flame-retarding properties, PAN copolymer composites were prepared with graphene oxide (GO) and sulfurdoped reduced GO (SrGO). Differential scanning calorimetry (DSC) analysis revealed that the activation energy of the composites for cyclization reaction during TOS decreased with SrGO content. Micro combustion calorimeter revealed enhanced flame-retarding properties of P(AN-co-DHS3)-SrGO composites, resulting in a low heat release capacity (21 J/gK) and high limiting oxygen index (44.7%) (superior to Nomex (R)). The high-flame retarding properties could be attributed to the high char layer produced by efficient TOS of the copolymer with the catechol unit and radical scavenging effect of sulfur-functionalized SrGO. Therefore, the incorporation of SrGO into PAN copolymers with catechol units is a good alternative for developing environmentally friendly high-flame retardants.
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