Highly efficient halogen-free flame retardants of thermally-oxidized polyacrylonitrile copolymers containing bio-derived caffeic acid derivatives

Title
Highly efficient halogen-free flame retardants of thermally-oxidized polyacrylonitrile copolymers containing bio-derived caffeic acid derivatives
Authors
구본철유남호김종호
Keywords
halogen-free flame retardants; caffeic acid; polyacrylonitrile
Issue Date
2020-11
Publisher
Polymer Chemistry
Citation
VOL 11, NO 41-6669
Abstract
Polyacrylonitrile (PAN) is utilized as a precursor for the production of high-performance flame retarding fibers and is also widely used for clothing fibers. Herein, we report the flame retarding properties of catechol-containing PAN copolymers. The comonomer, dihydroxy styrene (DHS), was prepared from bioderived caffeic acid (CA), which is a key intermediate in the biosynthesis of lignin. P(AN-co-DHS) andP(AN-co-CA) were synthesized by free radical polymerization. The effect of the comonomer structure on the stabilization of PAN copolymers was studied by differential scanning calorimetry, Fourier-transform infrared spectroscopy, and thermogravimetric analysis. The catechol and acid groups of P(AN-co-DHS) and P(AN-co-CA) are effective at lowering the activation energy (Ea) for cyclization of the AN through an ionic mechanism. In CA copolymers, the acid-protected poly(acrylonitrile-co-methyl caffeate) (P(AN-coMCA)) was found to be the most efficient in terms of Ea,
URI
http://pubs.kist.re.kr/handle/201004/71996
ISSN
1759-9954
Appears in Collections:
KIST Publication > Article
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