Enhancing the flame retardancy and UV resistance of polyamide 6 by introducing ternary supramolecular aggregates

Yuchun Li; Jinzhao Wang; Boqiong Xue; Shuheng Wang; Peng Qi; Jun Sun; Hongfei Li; Xiaoyu Gu; Sheng Zhang

doi:10.1016/j.chemosphere.2021.132100

Enhancing the flame retardancy and UV resistance of polyamide 6 by introducing ternary supramolecular aggregates

Chemosphere. 2022 Jan;287(Pt 2):132100. doi: 10.1016/j.chemosphere.2021.132100. Epub 2021 Sep 1.

Authors

Yuchun Li¹, Jinzhao Wang², Boqiong Xue², Shuheng Wang¹, Peng Qi¹, Jun Sun¹, Hongfei Li², Xiaoyu Gu³, Sheng Zhang⁴

Affiliations

¹ State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China.
² Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China.
³ State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China. Electronic address: guxy@mail.buct.edu.cn.
⁴ State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China. Electronic address: zhangsheng@mail.buct.edu.cn.

PMID: 34826889
DOI: 10.1016/j.chemosphere.2021.132100

Abstract

An integrated multi-functional additive was fabricated by successively grafting melamine (MEL) and phytic acid (PhA) on multiwalled carbon-nanotubes (MWNCTs), and was then applied in PA6 to improve the flame retardancy and light aging resistance of the composite. The limit oxygen index of PA6 composite containing 7 wt% PhA-MEL-MWCNTs was increased to 26.4 from 21.0. The smoke and CO release were significantly reduced by 48% and 88% respectively, and the severe melt dripping of PA6 in burning was eliminated. It is proved that PhA-MEL-MWCNTs can absorb ultraviolet (UV) radiation, and hence significantly reduces the mechanical property loss of the PA6 composite after UV aging. The tensile strength of the aged PA6/7 wt%PhA-MEL-MWCNTs composite sample only decreased by 18.1%, which was significantly lower than the loss rate of the control aged PA6 sample (62.5%). This protocol provides a new opportunity for fabricating long-life flame retardant polyamide composites.

Keywords: Anti-aging; Fire safety; Mechanical properties; Polyamide 6.

MeSH terms

Caprolactam* / analogs & derivatives
Nanotubes, Carbon*
Nylons
Polymers

Substances

Nanotubes, Carbon
Nylons
Polymers
nylon 6
Caprolactam